CN113376753A - Multi-order cascade optical signal delay amount adjustable delay device - Google Patents

Multi-order cascade optical signal delay amount adjustable delay device Download PDF

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CN113376753A
CN113376753A CN202110678360.7A CN202110678360A CN113376753A CN 113376753 A CN113376753 A CN 113376753A CN 202110678360 A CN202110678360 A CN 202110678360A CN 113376753 A CN113376753 A CN 113376753A
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delay
order
optical switch
switch
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王侠
欧阳竑
廖晖
何建兴
余志强
伍颖
汤科
邓东锋
杨庆锐
李文甫
刘鹏飞
唐绍宇
韦慕野
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CETC 34 Research Institute
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
    • G02B6/3548—1xN switch, i.e. one input and a selectable single output of N possible outputs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
    • G02B6/3546—NxM switch, i.e. a regular array of switches elements of matrix type constellation

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Abstract

The invention discloses a multi-order cascade optical signal delay adjustable delay device, which comprises a first 1 XN optical switch, a group of sequentially cascaded NXN optical switches and a second 1 XN optical switch which are consistent in structure, wherein N output ends of the ith-order NXN optical switch are respectively connected with N input ends of the (i + 1) th-order NXN optical switch, each connecting channel is provided with an optical delay unit formed by encircling optical fibers with specific lengths, and the optical delay units are sequentially marked as Ai1、Ai2、Ai3……AiNThe N output ports of the nth-order N × N optical switch up to the kth stage are connected to the N input ports of the second 1 × N optical switch, the input port, i.e., 1 port, of the first 1 × N optical switch is an optical input end of the delay device, and the output port, i.e., 1 port, of the second 1 × N optical switch is an optical output end of the delay device. The time delay device has the advantages of small insertion loss, arbitrarily adjustable time delay amount, low cost and good adaptability.

Description

Multi-order cascade optical signal delay amount adjustable delay device
Technical Field
The invention relates to the optical communication technology, in particular to a delay device with adjustable multi-order cascade optical signal delay amount.
Background
The optical delay technique is a technique for delaying an optical pulse signal by changing the length of a path through which the optical signal travels, and plays an important role in information technology, for example, in an optical fiber communication system, optical time division multiplexing and demultiplexing can be realized by using the optical delay technique; in the optical switching network, the optical delay technology can be used for solving the competition problem of the packets; the accurate guidance of the missile also requires a more accurate delayer-an optical delayer to be one of the good choices; in the microwave technology, because the loss of the cable is too large, the electric delayer is difficult to manufacture, and the electric signal is often converted into an optical signal, and the optical signal is recovered to the electric signal after the delay control is completed through the optical delay. In addition, optical delay techniques may also be used in buffers that control signal routing timing and to synchronize data bit streams to compensate for dispersion between different optical paths.
The existing optical delay device mostly adopts a parallel structure or a series structure of 2 multiplied by 2 optical switching units, and has small adjustable delay range, more required devices and large insertion loss.
Disclosure of Invention
The invention aims to provide a delay device with adjustable multi-order cascade optical signal delay amount aiming at the defects of the prior art. The delay device has the advantages of simple structure, small insertion loss, short shortest delay time, arbitrarily adjustable delay amount, reliable performance, convenient maintenance, strong expandability, low cost and good adaptability, and is suitable for the optical delay requirement of arbitrary stepping and arbitrary delay amount.
The technical scheme for realizing the purpose of the invention is as follows:
a multi-order cascade optical signal delay adjustable delay device comprises a first 1 xN optical switch, a group of sequentially cascaded NxN optical switches and a second 1 xN optical switch which are sequentially connected, wherein the group of sequentially cascaded NxN optical switches are consistent in structure, N is the number of input/output ports of the 1 x N, N xN optical switch, N is a positive integer not less than 2, N output ports of the first 1 xN optical switch are respectively connected with N input ports of a first, namely a 1 st order NxN optical switch, and each connecting channel is provided with a 0 th order optical delay unit A formed by encircling of optical fibers with specific length0NN is sequentially increased by 1 and is increased progressively, and 0 th order light delay units are sequentially marked as A01、A02、A03……A0N(ii) a N output ports of the 1 st order NXN optical switch are sequentially connected with N input ports of the 2 nd order NXN optical switch, a 1 st order optical delay unit formed by encircling optical fibers with specific lengths is arranged on each connecting channel, and the 1 st order optical delay units are sequentially marked as A11、A12、A13……A1NIn this way, the N output terminals of the ith order nxn optical switch are respectively connected with the N input terminals of the (i + 1) th order nxn optical switch, and each connection channel is provided with an optical delay unit surrounded by optical fibers with a specific length, which are sequentially marked as ai1、Ai2、Ai3……AiNI is an integer with an initial value of 0, and is sequentially increased by 1 to k, wherein k represents a total of k NxN optical switches, and so on until the k-th NxN optical switch has N output ports and a second output portN input ports of the 1 xn optical switch are connected, when i is equal to k, then the kth order optical delay unit aiNAre marked with A in turnk1、Ak2、Ak3……AkNWherein, the input port of the first 1 xn optical switch, i.e. 1 port, is the optical input end of the time delay device, the output port of the second 1 xn optical switch, i.e. 1 port, is the optical output end of the time delay device, when k is 0, it indicates that there is no N xn optical switch, N output ports of the first 1 xn optical switch are directly connected with N input ports of the second 1 xn optical switch in turn, and each connection channel is provided with an optical time delay unit surrounded by optical fibers with specific length, which is marked as a in turn01、A02、A03……A0N。
The length of the specific length of optical fiber is according to a formula
Figure BDA0003121784930000021
Where a is the delay time, d is the length of the optical fiber, c is the propagation speed of the optical signal in the optical fiber, and the speed c of the optical signal in the optical fiber is related to the wavelength of the optical signal, in general, a 1310nm optical wavelength delay of 1ns corresponds to a fiber length of 0.204286201m, and a 1550nm optical wavelength delay of 1ns corresponds to a fiber length of 0.204216621 m.
Each connecting channel is provided with an optical delay unit A formed by encircling optical fibers with specific lengthsiNThe configuration is specified according to:
1) setting the minimum value of the required delay amount to be A, the maximum value to be B and the step to be T, wherein A, B, T are all larger than 0, the unit is time unit including but not limited to ns, mu s, ms and the like, and B is larger than or equal to A + T, the delay amount An which can be realized by the delay device is equal to A + nT, wherein n is the delay series number and is An integer larger than or equal to 0, and the maximum delay amount A ismaxB or more, minimum delay amount Amin＝A0；
2)
Figure BDA0003121784930000022
For the delay A of the first channel between each stage of NxN optical switchesi1And, A0The value of (A) is determined by the number of the first optical switchThe fusion length of the 1 optical fiber should be as close to 0ns as possible in practical application, that is, the fusion length of the 1 st optical fiber at each stage should be as short as possible to ensure A0Less than or equal to A;
3) the required number of optical delay units is based on the formula
Figure BDA0003121784930000023
Calculating, then adopting a formula N not more than N k+11, calculating the required N multiplied by N optical switches k, wherein N, N and k are integers;
4) let A be the delay amount of the optical delay unit on each connection channeliNThen A isiN＝Ai1+[(N-1)×Ni]×T。
In general, the larger N of a 1 XN or NXN optical switch is, the smaller the number of optical switches required to complete a desired delay amount is, and the shorter the optical path is, the smaller the minimum delay amount A that can be achieved0The smaller the size; however, the larger the N is, the more difficult it is to implement the nxn optical switch, and the higher the selling price is, so what kind of scheme needs to be considered comprehensively according to the specific needs and costs of users.
The multi-order cascade optical signal delay device with any delay amount is suitable for setting optical delay units with any step and any delay amount, and optical signals can selectively pass through the optical delay units formed by encircling optical fibers with specific lengths on connecting channels through the optical switches, so that different delay amounts are obtained.
The delay device has the advantages of simple structure, small insertion loss, short shortest delay time, arbitrarily adjustable delay amount, reliable performance, convenient maintenance, strong expandability, low cost and good adaptability, and is suitable for the optical delay requirement of arbitrary stepping and arbitrary delay amount.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
fig. 2 is a schematic structural diagram of a 2 × 2 delay device in embodiment 1;
FIG. 3 is a schematic view of a 4X 4 delay device according to embodiment 2;
FIG. 4 is a schematic diagram showing a structure of an 8X 8 delay device in embodiment 3;
fig. 5 is a schematic structural diagram of a 10 × 10 delay device in embodiment 4.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto.
Example (b):
referring to fig. 1, a multi-order cascaded optical signal delay amount adjustable delay device includes a first 1 × N optical switch, a group of sequentially cascaded N × N optical switches and a second 1 × N optical switch, which are sequentially connected, where N is the number of input/output ports of the 1 × N, N × N optical switch, N is a positive integer not less than 2, N output ports of the first 1 × N optical switch are respectively connected with N input ports of a first, i.e., 1 st-order N × N optical switch, and each connection channel is provided with a 0 th-order optical delay unit a surrounded by optical fibers with a specific length0NN is sequentially increased by 1 and is increased progressively, and 0 th order light delay units are sequentially marked as A01、A02、A03……A0N(ii) a N output ports of the 1 st order NXN optical switch are sequentially connected with N input ports of the 2 nd order NXN optical switch, a 1 st order optical delay unit formed by encircling optical fibers with specific lengths is arranged on each connecting channel, and the 1 st order optical delay units are sequentially marked as A11、A12、A13……A1NIn this way, the N output terminals of the ith order nxn optical switch are respectively connected with the N input terminals of the (i + 1) th order nxn optical switch, and each connection channel is provided with an optical delay unit surrounded by optical fibers with a specific length, which are sequentially marked as ai1、Ai2、Ai3……AiNI is an integer with an initial value of 0, and sequentially adding 1 and increasing the k to k, where k represents a total of k N × N optical switches, and so on until N output ports of the kth-order N × N optical switch are connected to N input ports of the second 1 × N optical switch, and at this time, i is k, then the kth-order optical delay unit a isiNAre marked with A in turnk1、Ak2、Ak3……AkNWherein, the input port of the first 1 × N optical switch, i.e. the 1 port, is the optical input end of the time delay device, the output port of the second 1 × N optical switch, i.e. the 1 port, is the optical output end of the time delay device, and when k is equal to 0By time, it is meant that there are no nxn optical switches, and the N output ports of the first 1 xn optical switch are directly connected in sequence to the N input ports of the second 1 xn optical switch. Let A be the delay amount of the optical delay unit on each connection channeliNFor convenience, Table 1 is according to AiN＝Ai1+[(N-1)×Ni]The x T lists the delay A of each optical delay unit in the multi-order cascade optical signal delay device with any delayiNSpecific values of (a):
table 1:
Figure BDA0003121784930000041
the length of the specific length of the optical fiber in this example is based on the formula
Figure BDA0003121784930000042
Where a is the delay time, d is the length of the optical fiber, c is the propagation speed of the optical signal in the optical fiber, and the speed c of the optical signal in the optical fiber is related to the wavelength of the optical signal, in general, a 1310nm optical wavelength delay of 1ns corresponds to a fiber length of 0.204286201m, and a 1550nm optical wavelength delay of 1ns corresponds to a fiber length of 0.204216621 m.
In this example, each connection channel is provided with an optical delay unit A surrounded by a specific length of optical fiberiNThe configuration is specified according to:
1) setting the minimum value of the required delay amount to be A, the maximum value to be B and the step to be T, wherein A, B, T are all larger than 0, the unit is time unit including but not limited to ns, mu s, ms and the like, and B is larger than or equal to A + T, the delay amount An which can be realized by the delay device is equal to A + nT, wherein n is the delay series number and is An integer larger than or equal to 0, and the maximum delay amount A ismaxB or more, minimum delay amount Amin＝A0；
2)
Figure BDA0003121784930000043
For the delay A of the first channel between each stage of NxN optical switchesi1And, A0The value of (1) depends on the 1 st path of light between each order of optical switchesThe fusion length of the fiber should be as close to 0ns as practical, that is, the fusion length of the 1 st fiber of each stage should be as short as possible to ensure A0Less than or equal to A;
3) the required number of optical delay units is based on the formula
Figure BDA0003121784930000051
Calculating, then adopting a formula N not more than N k+11, calculating the required N multiplied by N optical switches k, wherein N, N and k are integers;
4) let A be the delay amount of the optical delay unit on each connection channeliNThen A isiN＝Ai1+[(N-1)×Ni]×T。
Specifically, the method comprises the following steps:
if the minimum delay amount of the required delay device is equal to 15ns, the maximum delay amount is equal to 640ns, and the stepping is 10ns, then
Figure BDA0003121784930000052
Because the maximum delay amount is greater than or equal to 640ns, n is a positive integer, and 63, namely the delay needed to be realized is An＝A+n×10ns，n＝0、1、2……63，
Figure BDA0003121784930000053
Ai1The fusion length of the first optical fiber between every two optical switches is controlled to make the total delay A thereof related to the fusion process of the optical fibers only0Not more than 15ns, in this example, A015ns, maximum delay a63＝A0The +63 × 10ns is 645ns > 640ns, and meets the requirement.
The above requirements are achieved by using 2 × 2, 4 × 4, 8 × 8, and 10 × 10 optical switches as experimental examples, as shown in fig. 2-5, in which the number behind each optical delay unit surrounded by optical fibers is denoted as anA + n × 10ns, wherein n is:
experiment 1: using 2X 2 optical switches, then 26＝64，63≤25+11, k takes 5, i.e. a total of 5 (th) order 2 × 2 optical switches are required, on each connection channelThe configuration of the optical delay unit is shown in fig. 2:
wherein A is0Has an actual delay amount of A0＝A01+A11+A21+A31+A41+A51The corresponding optical path is 1 × 2 in → 2 × 2 × 2, 2 × 02 × 3 → 2 × 12 × 4, 2 × 2 × 5 → 2 × 2 × 6, 2 × 2 × 7 → 2 × 2 × 8, 2 × 2 × 9 → 2 × 2 × 0, 2 × 2 × 1 → 1 × 2 out of the 1 st path of the full travel;
A1has an actual delay amount of A1＝A02+A11+A21+A31+A41+A51＝A01+T+A11+A21+A31+A41+A51＝A0+10, corresponding to the optical path 1 × 2 in → 2 × 2 × 2 out 2 nd way, 2 × 02 × 3 → 2 × 12 × 4, 2 × 2 × 5 → 2 × 2 × 6, 2 × 2 × 7 → 2 × 2 × 8, 2 × 2 × 9 → 2 × 2 × 0, 2 × 2 × 1 → 1 × 2 out 1 st way;
A2the actual delay amount is A2＝A01+A12+A21+A31+A41+A51＝A01+A11+2×T+A21+A31+A41+A51＝A0+2 × 10, corresponding to the optical path 2 × 2 × 3 → 2 × 02 × 4, the 2 nd path, 1 × 12 in → 2 × 22 × 5, 2 × 2 × 6 → 2 × 2 × 7, 2 × 2 × 8 → 2 × 2 × 9, 2 × 2 × 0 → 2 × 2 × 1, 2 × 2 × 2 → 1 × 2, and the 1 st path for all-out;
A3the actual delay amount is A3＝A02+A12+A21+A31+A41+A51＝A01+T+A11+2×T+A21+A31+A41+A51＝A0+3 × 10, corresponding to the optical path 1 × 2 in → 2 × 02 × 3, 2 × 12 × 4 → 2 × 22 × 5 in the 2 nd route, 2 × 2 × 6 → 2 × 2 × 7, 2 × 2 × 8 → 2 × 2 × 9, 2 × 2 × 0 → 2 × 2 × 1, 2 × 2 × 2 → 1 × 2 in the 1 st route;
by analogy in the following way,
A63for the actual delay amount to be A63＝A02+A12+A22+A32+A42+A52＝A01+T+A11+2×T+A21+4×T+A31+8×T+A41+16×T+A51+32×T＝A0+63 × T, corresponding to the 2 nd path of the optical path 1 × 2 in → 2 × 02 × 3, 2 × 12 × 4 → 2 × 22 × 5, 2 × 2 × 6 → 2 × 2 × 7, 2 × 2 × 8 → 2 × 2 × 9, 2 × 2 × 0 → 2 × 2 × 1, 2 × 2 × 2 → 1 × 2;
experiment 2: using 4X 4 optical switches, then 43＝64，63≤42+11, k takes 2, i.e. a total of 2 (2) order 4 × 4 optical switches are required, and the configuration of the optical delay unit on each connection channel is as shown in fig. 3:
wherein A is0The actual delay amount is A0＝A01+A11+A21The corresponding light path is the 1 st path of 1 multiplied by 4 in → 4 multiplied by 4, 4 multiplied by 4 → 4 multiplied by 1 out and all;
A1the actual delay amount is A1＝A02+A11+A21＝A01+T+A11+A21＝A0+10, corresponding to the light path 1 × 4 in → 4 × 4 r to go the 2 nd path, 4 × 4 r → 4 × 4 r, 4 × 2 r → 1 × 4 out to go the 1 st path;
A2the actual delay amount is A2＝A03+A11+A21＝A01+2×T+A11+A21＝A0+2 × 10, corresponding to the light path 1 × 4 in → 4 × 4 i go the 3 rd path, 4 × 4 i → 4 × 4 × 0, 4 × 2 i → 1 × 4 out all the 1 st path;
A3the actual delay amount is A3＝A04+A11+A21＝A01+3×T+A11+A21＝A0+3 × 10, corresponding to the light path 1 × 4 in → 4 × 4 i go the 4 th path, 4 × 4 i → 4 × 4 × 0, 4 × 2 i → 1 × 4 out all the 1 st path;
by analogy in the following way,
A63for the actual delay amount to be A63＝A04+A14+A24＝A01+3×T+A11+12×T+A21+48×T＝A0+63 × 10, corresponding to the light path 1 × 4 in → 4 × 4 r, 4 × 4 r → 4 × 4 × 0, 4 × 4 r → 4 × 1 out the 4 th path;
experiment 3: using 8X 8 optical switches, then 82＝64，63≤81+11, k is 1, i.e.A total of 1-step (one) 8 × 8 optical switches are required, and the configuration of the optical delay unit on each connection channel is shown in fig. 4:
wherein A is0The actual delay amount is A0＝A01+A11The corresponding optical path is the 1 st path of the total walking of 1 multiplied by 8 in → 8 multiplied by 8, 8 multiplied by 8 → 8 multiplied by 1 out;
A1the actual delay amount is A1＝A02+A11＝A01+T+A11＝A0+10, corresponding to the 1 × 8 in → 8 × 8 2 nd, 8 × 8 → 8 × 1 out 1 st path;
A2the actual delay amount is A2＝A03+A11＝A03+2×T+A11＝A0+2 × 10, corresponding to the 1 × 8 light path, i.e. the 1 × 8 input → 8 × 8 output path 3, 8 × 8 → 8 × 1 output path 1;
A3the actual delay amount is A3＝A04+A11＝A01+3×T+A11＝A0+3 × 10, corresponding to the 1 × 8 in → 8 × 8 in the 4 th path, 8 × 8 → 8 × 1 out in the 1 st path;
by analogy in the following way,
A63for the actual delay amount to be A63＝A08+A18＝A01+7×T+A11+56×T＝A0+63 × 10, corresponding to the optical path 1 × 8 in → 8 × 8, 8 × 8 → 8 × 1 out the 8 th path of the full travel;
experiment 4: using a 10 × 10 optical switch, 102＝100，63≤101+11, k is 1, i.e. a total of 1 order (10 × 10) optical switches are required, and the configuration of the optical delay unit on each connection channel is as shown in fig. 5:
wherein A is0The actual delay amount is A0＝A01+A11The corresponding optical path is the 1 st path of the total walking which is 1 multiplied by 10 entering → 10 multiplied by 10, 10 multiplied by 10 → 10 multiplied by 1;
A1the actual delay amount is A1＝A02+A11＝A01+T+A11＝A0+10, corresponding to the light path 1 × 10 in → 10 × 10 out the 2 nd path, 10 × 10 → 10 × 1 out the 1 st path;
A2actual amount of delayIs A2＝A03+A11＝A03+2×T+A11＝A0+2 × 10, the corresponding optical path is 1 × 10 in → 10 × 10 go the 3 rd path, 10 × 10 → 10 × 1 go out the 1 st path;
A3the actual delay amount is A3＝A04+A11＝A01+3×T+A11＝A0+3 × 10, corresponding to the light path 1 × 10 in → 10 × 10 out the 4 th path, 10 × 10 → 10 × 1 out the 1 st path;
by analogy in the following way,
A63for the actual delay amount to be A63＝A04+A17＝A01+3×T+A11+60×T＝A0+63 × T, corresponding optical path is 1 × 10 in → 10 × 10 out the 4 th path, 10 × 10 → 10 × 1 out the 7 th path;
the maximum time delay amount which can be reached by the scheme of experiment 4 is A99＝A0The +99 × 10 is 1005ns, and the corresponding optical path is 1 × 10 in → 10 × 10, 10 × 10 → 10 × 1 out of the 10 th path of the full travel.

Claims (3)

1. A multi-order cascade optical signal delay adjustable delay device is characterized by comprising a first 1 xN optical switch, a group of sequentially cascaded NxN optical switches and a second 1 xN optical switch which are in consistent structure, wherein N is the number of input/output ports of the 1 x N, N xN optical switch, N is a positive integer not less than 2, N output ports of the first 1 xN optical switch are respectively connected with N input ports of a first 1-order NxN optical switch, and each connecting channel is provided with a 0-order optical delay unit A formed by encircling of optical fibers with specific lengths0NN is sequentially increased by 1 and is increased progressively, and 0 th order light delay units are sequentially marked as A01、A02、A03……A0N(ii) a N output ports of the 1 st order NXN optical switch are sequentially connected with N input ports of the 2 nd order NXN optical switch, a 1 st order optical delay unit formed by encircling optical fibers with specific lengths is arranged on each connecting channel, and the 1 st order optical delay units are sequentially marked as A11、A12、A13……A1NBy analogy, the N output terminals of the ith order nxn optical switch are respectively in line with the (i + 1) th order NN input ends of the N optical switches are connected, and each connecting channel is provided with an optical delay unit which is formed by encircling optical fibers with specific length and is marked as A in sequencei1、Ai2、Ai3……AiNI is an integer with an initial value of 0, and sequentially adding 1 and increasing the k to k, where k represents a total of k N × N optical switches, and so on until N output ports of the kth-order N × N optical switch are connected to N input ports of the second 1 × N optical switch, and at this time, i is k, then the kth-order optical delay unit a isiNAre marked with A in turnk1、Ak2、Ak3……AkNWherein, the input port of the first 1 xn optical switch, i.e. 1 port, is the optical input end of the time delay device, the output port of the second 1 xn optical switch, i.e. 1 port, is the optical output end of the time delay device, when k is 0, it indicates that there is no N xn optical switch, N output ports of the first 1 xn optical switch are directly connected with N input ports of the second 1 xn optical switch in turn, and each connection channel is provided with an optical time delay unit surrounded by optical fibers with specific length, which is marked as a in turn01、A02、A03……A0N。
2. The delay apparatus of claim 1, wherein the delay apparatus comprises a plurality of stages of cascaded optical signals,
the length of the specific length of optical fiber is according to a formula
Figure FDA0003121784920000011
And calculating, wherein A is delay time, d is the length of the optical fiber, and c is the propagation speed of the optical signal in the optical fiber.
3. The delay apparatus of claim 1, wherein the delay apparatus comprises a plurality of stages of cascaded optical signals,
each connecting channel is provided with an optical delay unit A formed by encircling optical fibers with specific lengthsiNThe configuration is specified according to:
1) setting the minimum value of the required delay amount to be A, the maximum value to be B and the step to be T, wherein A, B, T are all larger than 0 and the unit is a time unitAnd B is more than or equal to A + T, the delay amount which can be realized by the delay device is An-A + nT, wherein n is the delay progression and is An integer which is more than or equal to 0, and the maximum delay amount AmaxB or more, minimum delay amount Amin＝A0；
2)
Figure FDA0003121784920000012
For the delay A of the first channel between each stage of NxN optical switchesi1And, A0The value of (1) depends on the fusion length of the 1 st optical fiber between each step of optical switch;
3) the required number of optical delay units is based on the formula
Figure FDA0003121784920000013
Calculating, then adopting a formula N not more than Nk+11, calculating the required N multiplied by N optical switches k, wherein N, N and k are integers;
4) let A be the delay amount of the optical delay unit on each connection channeliNThen A isiN＝Ai1+[(N-1)×Ni]×T。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101000395A (en) * 2006-01-12 2007-07-18 杨淑雯 Adjustable optical-fibre time-relay system
CN207096498U (en) * 2016-12-09 2018-03-13 上海信及光子集成技术有限公司 A kind of high-precision N bit adjustable light delays
CN108227079A (en) * 2016-12-09 2018-06-29 上海信及光子集成技术有限公司 A kind of high-precision N-bit adjustable light delays
CN212086198U (en) * 2019-12-18 2020-12-04 中国电子科技集团公司第四十三研究所 Self-adaptive high-precision optical fiber delay system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101000395A (en) * 2006-01-12 2007-07-18 杨淑雯 Adjustable optical-fibre time-relay system
CN207096498U (en) * 2016-12-09 2018-03-13 上海信及光子集成技术有限公司 A kind of high-precision N bit adjustable light delays
CN108227079A (en) * 2016-12-09 2018-06-29 上海信及光子集成技术有限公司 A kind of high-precision N-bit adjustable light delays
CN212086198U (en) * 2019-12-18 2020-12-04 中国电子科技集团公司第四十三研究所 Self-adaptive high-precision optical fiber delay system

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