CN1044413C - Optic internet of free space and input interface thereof - Google Patents

Abstract

A new topological optical system composed of node level and interconnection level. The 1×2 binary grating and optical assembly placed on the diaphragm plane of the symmetrical off-axis optical 4F imaging system constitute the interconnection level, and it is equipped with a fan-in of 4 input interface. In this system, the optical carrier channel is fully utilized, and there is no need for redundant absorption windows. When multi-level interconnection, the interconnection functions of each level are exactly the same, so the optical hardware of each level is exactly the same, the system transmission rate is 34% higher than the existing technology, and the device structure is simple. , easy to adjust, can be widely used in high-speed optical interconnect parallel processing computers and large-capacity optical cross-connect and optical switching network equipment.

Description

Free-space optical interconnection network and input interface

The present invention is a kind of optical interconnection network and the optical system that constitutes this network, can be used for light interconnection parallel processing computer and optical communication field.

The Free Space Optics multistage interconnection is that the development arithmetic speed is one of key equipment system of hundred, hundred billion times and even TFlops light interconnection parallel processing high-performance computer and broad band Integrated service digital communication network, topic between various countries very pay close attention to.U.S. AT﹠amp; The TBELL laboratory has proposed to adopt the Free Space Optics exchanging network system of full cross-connect network in November, 1991, see United States Patent (USP) U.Spatent 5,00077,483, this network system is made up of ahrens prism, prism grating, lens, and system complex is difficult to adjust, volume is big, and interconnecting number and interconnection density are low.Ap-plled Optics in 1993, Vol.32, No.26, PP5152 have reported first generation Free Space Optics exchanging network system, A pplied Optics in 1994, Vol.33, No.8, PP1601 have reported second generation Free Space Optics exchanging network system.First, two generation the Free Space Optics exchange network all be to adopt banyan (Banyan) network, form by node level and interconnection level, realize in the optical system of this network node level with symmetry from the dexterous picture dot FET-SEED of electrooptical effect S-SEED as photoswitch node array device, interconnection level comprises semiconductor laser alignment, entangle shape, the input pumping light system, symmetrical from axle optics 4F imaging system, optical axis is corrected and clock biasing laser beam array pumping system, this network is to realize its interconnection function with a slice 1 * 3 binary phase grating in the 4F optical imaging system, the network optical system is simple, interconnecting number and interconnection density are big, but these interconnection network have following three shortcomings: (1) 1 * 3 binary phase grating will transmit that each bar is divided into three optical carrier channels in the input optical carrier passage of information, because the fan-in of each node is 2 in the network node level, therefore, 2/3 optical carrier channel formation banyan network transmitting data information is only arranged, 1/3 optical carrier channel to no avail, waste 1/3 luminous power, caused the transfer rate of system to reduce.(2) in order to make 1/3 completely written-off optical channel not cause that string is alive, on photoswitch node array device, want many windows of 1/3 of not putting, absorb the luminous power of these completely written-off optical carrier channels, so many, the complex structure of window of photoswitch node array device influences transfer rate and improves.(3) free space banyan multistage network system is owing to every grade of interconnection function difference, so each grade optical hardware is also inequality, optics is adjusted relative complex.

The objective of the invention is to improve the utilization factor of optical carrier channel in the optical interconnection network system, reduce optical power loss, improve the complicacy of transfer efficiency, simplification photoswitch node device, simplied system structure.The present invention proposes a kind of Free Space Optics multistage interconnection topological structure of novelty, and the technological means of calculating grating realization interconnection function in the 4F imaging system with a slice 1 * 2 binary position mutually is provided.In order to reduce interconnection progression, the present invention has proposed fan-out between input port and optical interconnection network be 4 input interface and Optical Implementation means thereof.Realize the object of the invention, by the free-space optical interconnection network that node level and interconnection level are formed, node fan-in and fan-out are 2 on the node level, and the interconnected relationship between the node level is:

Wherein K is a network input port sequence number, and K ' is a network output mouth sequence number, and value is 0,1,2 ..., N-1; Input port light beam dot matrix number N is 2～1000.

Constitute the optical system of described free-space optical interconnection network, its node level with dexterous picture dot FET-SEED or CMOS-SEED as photoswitch node array device, interconnection level comprises semiconductor laser alignment, entangles shape, the input pumping light system, symmetrical from axle optics 4F imaging system, cascade system, optical axis is corrected wedge and clock biasing laser beam array pumping system, it is characterized in that:

(1) described cascade system comprises and places symmetrical 1 * 2 binary position phase calculation holographic grating and symmetrical optical package between axle optics 4F imaging system diaphragm plane and output lens on axle optics 4F imaging system diaphragm plane,

(2) 1 * 2 binary position phase calculation holographic grating of described cascade system is the striated grating, and its grating phase constant is P, and the grating position phase degree of depth is D, $P=\frac{2\mathrm{F\&lambda;}}{{\mathrm{<figure-callout\; id="0"\; label="Nd"\; filenames="C9610048800182.png,C9610048800192.png"\; state="\{\{state\}\}">Nd</figure-callout>}}_0},D=\frac{\mathrm{\&lambda;}}{2(n-1)}$ Wherein N is an input port light beam dot matrix number, the adjacent two luminous point spacing d of input port ₀Be 5um-2000um, symmetrical is 5mm-50mm from axle optics 4F imaging system focal length of lens F, and lambda1-wavelength λ is 0.2um-20um, and n is the grating material refractive index.

(3) optical package of described cascade system is made up of two cylindrical lenses, also can be made up of two wedges or four wedges, and laser beam array is compressed one times in the angle of diffraction of x direction.Owing to add above-mentioned cascade system, the symmetry of this optical system can not be strict 4F system from axle optics 4F imaging system, and the 1.2-2.0 that distance can be focal length of lens F between its output lens and the diaphragm plane doubly.

For picture dot window with carrier wave hot spot, biasing light beam and the strict aligning of signal beams switching node array device, this optical system can be equipped with illumination and the monitoring system of being made up of lighting source and CCD camera head, lighting source can be from vehement lamp or light emitting diode, be radiated on the imaging plane, the hot spot dot matrix of imaging plane and the window of photoswitch node array device monitored and debugged with the CCD camera head.

For guaranteeing this optical system steady operation, its architecture adopts sealing flush type magnetic conductance rail structure, and each several part is enclosed in respectively in the steel pipe, imbeds in the magnetic conductance rail again and forms modular organization, adopts a pair of wedge accurately to adjust optical axis between the each several part.

For not increasing interconnection progression, reduce the retardation time of network, the present invention also proposes a kind of input interface that is used for optical interconnection network, by dexterous picture dot FET-SEED or CMOS-SEED as photoswitch node array device, semiconductor laser alignment, entangle shape, input pumping light system, symmetrical from axle 4F imaging system, optical axis corrects wedge and clock biasing laser beam array pumping system constitutes, and it is characterized in that:

(1) place a slice 1 * 4 binary phase grating in described symmetry on diaphragm plane between the lens of axle optics 4F imaging system, sequence number 0-N-2 optical carrier channel is adjacent two luminous point spacing d on imaging surface ₀, sequence number N-1 and the luminous point spacing d of sequence number N-2 optical carrier channel on imaging surface ₁, described 1 * 4 monobasic phase grating angle of diffraction makes d ₀≠ d ₁

(2) fan-in is the strict row standard of 2N luminous point of 2 non-homogeneous arrangements on switching node array device receive window and the described imaging surface, and its output window keeps proportional spacing to arrange.

As described optical system, this input interface can be equipped with illumination and the monitoring system of being made up of lighting source and CCD camera head, lighting source can be incandescent lamp or light emitting diode, be radiated on the imaging plane, the hot spot dot matrix of imaging plane and the window of photoswitch node array device monitored and debugged with the CCD camera head.

This input interface architecture also should adopt sealing flush type magnetic conductance rail structure, and each several part is enclosed in respectively in the steel pipe, imbeds in the magnetic conductance rail again and forms modular organization, adopts a pair of wedge accurately to adjust optical axis between the each several part.

The present invention has the following advantages:

(1) all optical carrier passages that come out from 1 * 2 binary position phase calculation holographic grating in the optical system, all all be used to constitute optical interconnection network, its utilization factor is 100%, and the transfer efficiency of optical system has improved 34% compared with prior art, causes the system transmissions rate to increase.

(2) since in the optical system optical carrier channel be utilized fully, so do not need to be provided with 1/3 absorbing window on the switching node array device, so that this device architecture becomes is simple.

(3) optical interconnection network of the present invention is used for when multistage interconnected, and each grade interconnection function is identical, and each grade optical hardware structure is also just identical, so this optical system structure is simple relatively, easy to adjust.

(4) to propose fan-out be 4 input interface in the present invention, in the 4F imaging system, only uses a slice 1 * 4 binary phase grating can realize that it is simple in structure.It is that hundred billion optical interconnection parallel processing computers to TFlops are connected and high capacity optical switching network equipment with high capacity optical crossover in the high capacity Broadband Integrated Services Digital network that the present invention can be widely used in arithmetic speed.

Fig. 1 a is the topological diagram of optical interconnection network of the present invention.

Fig. 1 b is the interconnection topology figure when using binary number representation network input/output port sequence number

Fig. 2 is for realizing the optical system of optical interconnection network of the present invention.

Fig. 3 a is 1 * 2 binary raster optical schematic diagram of optical system cascade of the present invention system.

Fig. 3 b is 1 * 2 binary raster cycle of cascade system position phase hopping structures figure.

Fig. 4 a be N bundle input light through 1 * 2 binary raster after object plane and resemble the dot matrix sequence of face.

Fig. 4 b be N bundle input light through 1 * 2 binary raster and optical package after input/output port arrange.

Fig. 5 is an optical interconnection network system optics schematic diagram of the present invention.

Fig. 6 is an one dimension free-space optical interconnection network system.

Fig. 7 a is two-dimentional free-space optical interconnection network system.

Fig. 7 b is the corresponding segmented network topological diagram of 7a.

Fig. 8 is the optical schematic diagram of optical interconnection network of the present invention system in the interconnection of Y direction.

Fig. 9 is actual two-dimentional free space optical system interconnection.

Figure 10 is an input interface of the present invention.

Figure 11 is input interface input and output dot matrix.

Figure 12 is the input interface optical schematic diagram.

Figure 13 is the communication network that 8 practical input interface and one dimension free-space optical interconnection network are constituted for input/output port N.

Existing accompanying drawings enforcement situation of the present invention.For convenience of description, with optical interconnection network called after comega interconnection network of the present invention.

Fig. 1 a represents light beam dot matrix number N=16 o'clock, by the determined topological diagram of the interconnected relationship of optical interconnection network of the present invention, among the figure 0,1,2 ... N-1 is input port and output port sequence number, if with one group of binary number X _N-1X _N-2X ₁X ₀(n=log ₂N), then the input/output port sequence number can be represented with the following relationship formula:

Comega(X _n-1X _n-2X ₁X ₀)=DX ₀X _n-1X ₂X ₁

Corresponding interconnection network topological diagram as shown in figure 10.

Fig. 2 is for realizing the optical system of optical interconnection figure network of the present invention, with dexterous picture dot FET-SEED or CMOS-SEED as photoswitch node array device, place on this optical system imaging plane, the semiconductor laser beam of native system provides the through-put power of light carrier passage, because launching the diverging light that the ratio of the vertical and horizontal emission angle of laser beam was generally 4: 1, semiconductor laser asks, and optical system operation to need the bore diameter be the circular laser beam of collimation of 4-5mm, for this reason, semiconductor laser beam must pass through by collimation lens and entangle the collimation that the shape prism is formed, entangle shape optical system LCC1, become the circular laser beam of collimation.An input position phase calculation holographic grating BPG1 forms parallel light carrier channel array, and it can the laser beam that a branch of collimation is parallel becomes the optical carrier passage of N * M array, can be observed the hot spot dot matrix of N * M on the IP1 of the focal plane of input lens L1.The employing of this optical system is symmetrical, and it comprises input lens L1 and output lens L2 from axle optics 4F imaging system, and the focal plane of L1 is LP1, and the focal plane of L2 is LP2.The cascade system of this optical system comprise place symmetrical on axle optics 4F imaging system LP1-L1-L2-LP2 diaphragm plane 1 * 2 phase calculation holographic grating BPG2 and the optical package OCD between diaphragm plane and the output lens L2, this optical package OCD is made up of two cylindrical lenses among Fig. 2, and laser beam array is compressed one times in the angle of diffraction of directions X.For optical interconnection network being applied in high-performance computer system or the high capacity optical switching network system, must place the photoswitch node array device of a N * M picture dot on the IP1 focal plane, also must place the switching node array device on the IP2 focal plane, and for light shutter devices such as dexterous picture dot FET-SEED or CMOS-SEED are normally moved, except input N * M flashlight is incident on the signal window, also must there be non-homogeneous spacing N * 2M clock biasing beam array to be radiated on the biasing pumping window, among Fig. 2 clock biasing laser beam array pumping system II by collimation with entangle shape optical system LCC2 and carry-out bit mutually calculation holographic grating BPG3 constitute, because each node switch fan-in of the photoswitch node array on the IP2 focal plane is 2, so go on two signal windows of an optical node switch at two adjacent luminous points of horizontal X direction.The coaxial of each optical element of whole optical system all guarantees that by high accuracy mechanical processing whole optical system is divided five parts with one heart, and each several part is enclosed in respectively in No. 45 steel pipes, imbeds the structure that forms modular in the magnetic conductance rail again.Adjust optical axis exactly with a pair of wedge between each several part, make each hot spot array strictly aim at each window array.

For with hot spot dot matrix alignment light switching node array device window strictly, this optical system is equipped with the illumination monitoring system of being made up of lighting source and CCD camera head, illumination monitoring system I1-CCD1 is made up of lighting source 11 and CCD camera head CCD1, when observing monitoring, in light path, insert two λ/2 wave plates, see View sign among Fig. 2, allow lighting source be radiated on the IP1 focal plane, hot spot dot matrix and window are carried out the strictness monitoring with the CCD1 camera head.I2-CCD2 is the monitoring system of IP2 focal plane.Because each level has the monitoring system of independently throwing light on, with photoswitch node array device interface, debugging is convenient, when system moves, λ/2 wave plates is extracted out from light path, sees openation among Fig. 2.

Fig. 3 a is 1 * 2 a binary position phase calculation holographic grating BPG2 optical schematic diagram of this optical system cascade system, and it places on the diaphragm plane between L1 and the L2, and making each bundle optical diffraction is m=1 and m=-1 two bundle diffraction lights, according to position phase calculation holographic grating equation:

P (dn θ _d-sin θ _i)=m λ is θ wherein _iBe beam incident angle, θ _dBe the angle of diffraction of m order diffraction light beam, P is the grating cycle, and λ is a light beam wavelength, and m is the m order of diffraction, as long as change the periodic structure P of BPG32, just can change the diffraction angle of m=1 and each order of diffraction of m=-1 _d, be the output lens L2 of f from the diffraction light of grating output by focal length, will change into by the diffraction light changes at different levels of angular distribution output as the plane on by the spot array of space distribution, the hot spot of each diffraction light is apart from the distance of optical axis 00 ＇.

h=ftgθ _d

In order to make the optical carrier passage satisfy the interconnected relationship of optical interconnection network in the sequence of the input port of lens L1 front focal plane and the output port on the lens L2 back focal plane, 1 * 2 binary position phase calculation holographic grating BPG2 can be by following method not: the light beam dot matrix of establishing input port on the object lens face is N, arranging sequence number is 0,1,2 ... N-2, N-1, its adjacent two luminous point spacings are d ₀, behind BPG2, every bundle input beam is divided into m=1 and m=-1 two bundle diffraction lights, and should be Nd in the spacing that is output on the image planes ₀The angle of two bundle diffraction lights of m=± 1 should be designed to $\mathrm{\&Delta;\&theta;}=2\mathrm{<figure-callout\; id="0"\; label="arctg\; Nd"\; filenames="C9610048800182.png,C9610048800192.png"\; state="\{\{state\}\}">arctg</figure-callout>}\frac{{\mathrm{Nd}}_{}}{}\frac{{}_0}{2f}$

In order to determine grating phase constant p, consider under the normal incidence situation incident angle θ _i=0, the diffraction angle of m=± 1 grade _{+ 1}Be that half of light angle △ θ, i.e. θ are penetrated in two bundle dirts _{+ 1} $=\mathrm{\&Delta;\&theta;}/2=\mathrm{<figure-callout\; id="0"\; label="arctg\; Nd"\; filenames="C9610048800182.png,C9610048800192.png"\; state="\{\{state\}\}">arctg</figure-callout>}\frac{{\mathrm{Nd}}_{}}{}\frac{{}_0}{2f}$ , have according to grating equation: P (sin △ θ/2-sin θ _i)=λ, $P=\frac{\mathrm{\&lambda;}}{\sin \mathrm{\&Delta;\&theta;}/2}=\frac{\mathrm{\&lambda;}}{\sin \left(\mathrm{<figure-callout\; id="0"\; label="arctg\; Nd"\; filenames="C9610048800182.png,C9610048800192.png"\; state="\{\{state\}\}">arctg</figure-callout>}\frac{{\mathrm{Nd}}_{}}{}\frac{{}_0}{2f}\right)}\&ap;\frac{2\mathrm{f\&lambda;}}{{\mathrm{<figure-callout\; id="0"\; label="Nd"\; filenames="C9610048800182.png,C9610048800192.png"\; state="\{\{state\}\}">Nd</figure-callout>}}_0}$ For example working as input port light beam dot matrix is N=8, adjacent two-beam dot spacing d ₀=400um, lambda1-wavelength λ are 0.85um, the focal distance f=25mm of fourier transform lens, and then can calculate p by following formula is 13.28um, according to the value of grating phase constant p, can design and produce 1 * 2 grating, its grating cycle position phase hopping structures is shown in Fig. 3 b.

Fig. 4 a shows that after N asked input light through the BPG2 phase grating, it was Nd that every bundle input light all is divided into spacing to same direction successively ₀Two the bundle flashlights, forms 2N light beam dot matrix, its arrangement sequence number be N-1, N-2 ... 2,1,0, N-1, N-2 ..., 2,1,0

Because the fan-in fan-out of switching node all is 2, so adjacent two-beam is incident on the node, the output port sequence number on the imaging surface is arranged as $0^{\&prime;}\&CenterDot;\&CenterDot;\&CenterDot;{(\frac{N}{2}-2)}^{\&prime;},$ ${(\frac{N}{2}-1)}^{\&prime;},\frac{N^{\&prime;}}{2},\&CenterDot;\&CenterDot;\&CenterDot;{(N-2)}^{\&prime;},{(N-1)}^{\&prime;}$ And the spacing of two adjacent output ports has increased by one times, sees Fig. 4 a.Be convenient narration, with N=8 is example, the optical carrier channel of input port sequence number K=0, being transferred to output sequence number K ' by this optical system is 3 ' and 7 ' port, the optical carrier channel of input sequence number K=6, be transferred to sequence number K ' and be 0 ' and 4 ' port, and the adjacent port spacing just in time is the twice of input port spacing on the output plane, shown in Fig. 4 a.

In the optical system of reality, for convenience of cascade, adjacent spots spacing and input plane hot spot dot matrix adjacent spots spacing should be identical in the output plane hot spot dot matrix, because BPG2 has enlarged one times with input beam array subtended angle, so between BPG2 and output lens L2, must introduce an optical package OCD, this optical package with laser beam array in that the compression of the angle of diffraction of directions X-doubly, it can be made up of two cylindrical mirrors, sees Fig. 5.

The one dimension free-space optical interconnection network system that figure G represents is made up of many interconnection level of identical interconnected relationship, on the input and output plane, if the N port is arranged in directions X, n bit data coding is arranged in the y direction, and the data of N port are fully with parallel port form parallel transfer.It is rearrangeable that but this one dimension interconnected network system composition data is encoded to N input/output port of n position, the low obstruction or choke free interconnection exchange communication network.

Free space multistage network system is divided into peacekeeping two dimension free space network, and in the two-dimentional free space comega multistage network, input and output plane upper port is arranged as two-dimensional array as 4 * 4, and 8 * 8,16 * 16 ... N * N.Realize the communication of any port in the two-dimensional array port on the input and output plane, must adopt two-dimentional free space network system.Two dimension free space Comega interconnection network.The port of arranging in the Y direction on the input and output plane is pressed the Comega interconnection function and is connected on the Y direction, be called Y direction Comega interconnection network.For discussing for simplicity, be arranged as 4 * 4 arrays with input and output plane port, two-dimentional free space Comega network shown in Fig. 7 a is that example is discussed, and the 0th and the 1st interconnection level is the one dimension Comega interconnection of directions X among the figure, and the 2nd and the 3rd interconnection level is the one dimension Comega interconnection of Y direction.Fig. 7 a two dimension free space Comega network.Its corresponding sectional type one dimension Comega network topology structure is seen Fig. 7 b.

According to preceding surface analysis, the Optical Implementation of the Optical Implementation of two-dimentional free space Comega network and one dimension free space Comega network is identical, and the Optical Implementation of directions X one dimension free space Comega network and optical system are as shown in Figure 5.The one dimension free space Comega network Optical Implementation and the optical system of Y direction get final product BPG2 among Fig. 2 and Fig. 5 and light beam subtended angle compression optical combiner OCD rotation 90, see Fig. 8.It should be noted that, light interconnection line in Fig. 7 a and the actual optical system is incomplete same, and concerning directions X one dimension Comega interconnection, the inversion imaging relations of Y direction has been left in the basket, concerning Y direction one dimension Comega interconnection, the inversion imaging relations of directions X has been left in the basket.For the 4f imaging system, this ignores the not influence of realization to the interconnection topology of one dimension Comega network, because Fig. 8 has expressed the necessary spot displacement that is produced by BPG and lens.In the actual optical system, optical carrier interconnection light beam as shown in Figure 9.In directions X one dimension Comega network, be inverted sign if on output plane, will be arranged in the node ID of Y direction, see first and second node levels among Fig. 9.On the Y direction one dimension Comega network output plane, the node ID that is arranged in directions X is inverted sign sees third and fourth node level among Fig. 9, then the pairing sectional type Comega network topology of two-dimentional free space Comega network and Fig. 7 b as shown in Figure 9 is identical.

The free space multistage network is made up of interconnection level and node level, and at present, the photoswitch node level is divided into five types: 2 pattern nodes, (2,1,1) node, (2,2,2) node, (4,1,1) node and (4,4,4) photoswitch node.Optical system for reality, one peacekeeping two dimension Free Space Optics Comega network, all adopt (2,1,1) the photoswitch node is formed clog-free or low obstruction free space optical communication network, in order not increase interconnection progression, reduce the retardation time of network, then joint is counted at least to expand and is twice, obviously from the input port plane to the asking of Free Space Optics Comega network, also need input interface.Figure 10 is for implementing the optical system of input interface of the present invention.The input port number of this input interface is N, and the fan-out of each port is 4, and then the output port number of network interface becomes 2N, and its fan-in is 2, and the input and output dot matrix of input interface of the present invention is seen Figure 11.

The optical system that realizes input interface network shown in Figure 11 as shown in figure 12, the position phase binary raster BPG4 of a slice 1 * 4 is inserted in the 4f optical system on the diaphragm plane between two lens.BPG4 is with a branch of) optical diffraction becomes M=+1 ,+3 ,-1 ,-3 four orders of diffraction.BPG4 is divided into 4 beam optics passages with each beam optics carrier channel, can make the different orders of diffraction have different angles if change the BPG4 periodic structure as previously described, when 4N bar light beam scioptics, output lens is made angle one spatial alternation to 4N bar light, will become 4N hot spot array on imaging surface to the 4N bar light that optical axis has different angles.In the output facula that makes the input interface network, the hot spot of the high diffracting grade that noise is useless does not produce string to data passage hot spot dot matrix and lives.Must adjust the angle of diffraction of BPG4, make the hot spot of the high diffracting grade that noise is useless deviate from the hot spot dot matrix of data channel, promptly d0 ≠ d1 is as seen in Figure 11 and Figure 12, from the N bar carrier wave optical channel of 1 * N port in the 4F imaging optical system, positive PG4 and output lens through 1 * 4, having formed fan-in on the output imaging plane is 2N output port of 2 non-homogeneous arrangements.Accurately design FET-SEED receive window array the non-homogeneous window strictness of itself and 2N is aimed at, and the output window of FET-SEED still keeps evenly being spaced, and the assurance system normally moves.

With n bit data coding input/output port is that the system of N is an example, (2,1,1) the photoswitch node is seen Figure 13 (attention interconnection level and node level are adjusted according to port number N) as the communication network system clog-free or low obstruction of the one dimension Free Space Optics Comega network system composition of network node level.So this network can be generalized to the two-dimentional Free Space Optics network system of N * N.Two dimension Free Space Optics Comega network can be used for high capacity Broadband Integrated Services Digital network communication system.Figure 10 and Comega input interface network shown in Figure 11 can be used as the input interface network of Fig. 7-a or shown in Figure 9 two-dimentional free space Comega optical switching network system.Constitute jumbo optical switching network in the Broadband Integrated Services Digital network.

Claims (9)

1. free-space optical interconnection network of forming by node level and interconnection level, node fan-in and fan-out are 2 on the node level, it is characterized in that the interconnected relationship between the node level is:

Wherein K is a network input port sequence number, and K ' is a network output mouth sequence number, and value is 0,1,2 ..., N-1; Input port light beam dot matrix number N is 2～1000.

2. optical system that is used to constitute the described optical interconnection network of claim 1, its node level with dexterous picture dot FET-SEED or CMOS-SEED as photoswitch node array device, interconnection level comprises semiconductor laser alignment, entangles shape, the input pumping light system, symmetrical from axle optics 4F imaging system, cascade system, optical axis is corrected wedge and clock biasing laser beam array pumping system, it is characterized in that:

(1) described cascade system comprises and places symmetrical 1 * 2 binary position phase calculation holographic grating and symmetrical optical package between axle optics 4F imaging diaphragm plane and output lens on axle optics 4F imaging system diaphragm plane;

(2) 1 * 2 binary position phase calculation holographic grating of described cascade system is the striated grating, and its grating phase constant is P, and the grating position phase degree of depth is D, $P=\frac{2\mathrm{F\&lambda;}}{{\mathrm{Nd}}_0},D=\frac{\mathrm{\&lambda;}}{2(n-1)}$ Wherein N is an input port light beam dot matrix number, the adjacent two luminous point spacing d of input port ₀Be 5um-2000um, symmetrical is 5mm-50mm from axle optics 4F imaging system focal length of lens F, and incident light wave is grown into and is that 0.2um-20um, n are the grating material refractive index.

(3) optical package of described cascade system is made up of two cylindrical lenses, and laser beam array is compressed one times in the angle of diffraction of x direction.

3. optical system as claimed in claim 2 is characterized in that described symmetry distance between axle optics 4F imaging system output lens and diaphragm plane can be 1.2-2.0 times of focal length of lens F.

4. as claim 2 or 3 described optical systems, it is characterized in that this optical system is equipped with illumination and the monitoring system of being made up of lighting source CCD camera head, lighting source can be incandescent lamp or light emitting diode, be radiated on the imaging plane, the hot spot dot matrix of imaging plane and the window of photoswitch node array device monitored and debugged with the CCD camera head.

5. as claim 2 or 3 described optical systems, it is characterized in that its architecture adopts sealing flush type magnetic conductance rail structure, each several part is enclosed in respectively in the steel pipe, imbeds in the magnetic conductance rail again and forms modular organization, adopts between the each several part-wedge is accurately adjusted optical axis.

6. optical system as claimed in claim 4, it is characterized in that its architecture adopts sealing flush type magnetic conductance rail structure, each several part is enclosed in respectively in the steel pipe, imbeds in the magnetic conductance rail again and forms modular organization, adopts a pair of wedge accurately to adjust optical axis between the each several part.

7. input interface that is used for the described optical interconnection network of claim 1, by from electrooptical effect spatial light modulator SEED, dexterous picture dot FET-SEED or CMOS-SEED as photoswitch node array device, semiconductor laser alignment, entangle shape, input pumping light system, symmetrical from axle optics 4F imaging system, optical axis corrects wedge and clock biasing laser beam array pumping system constitutes, and it is characterized in that:

(1) place a slice 1 * 4 binary phase grating in described symmetry on diaphragm plane between axle optics 4F imaging system two lens, sequence number 0-N-2 optical carrier channel is adjacent two luminous point spacing d on imaging surface ₀, sequence number N-1 and the luminous point spacing d of sequence number N-2 optical carrier channel on imaging surface ₁, described 1 * 4 binary phase grating angle of diffraction makes d ₀≠ d ₁

(2) fan-in is strict aligning of 2N luminous point of 2 non-homogeneous arrangements on switching node array device receive window and the described imaging surface, and its output window keeps proportional spacing arrangement.

8. input interface as claimed in claim 7, it is characterized in that this input interface is equipped with illumination and the monitoring system of being made up of lighting source and CCD camera head, lighting source can be incandescent lamp or light emitting diode, be radiated on the imaging plane, the hot spot dot matrix of imaging plane and the window of photoswitch node array device monitored and debugged with the CCD camera head.

9. as claim 7 or 8 described input interfaces, it is characterized in that its architecture adopts sealing flush type magnetic conductance rail structure, each several part is enclosed in respectively in the steel pipe, imbeds in the magnetic conductance rail again and forms modular organization, adopts a pair of wedge accurately to adjust optical axis between the each several part.

Images