CN1414728A - Full optical fibre shift light pulse sequence compression-expansion mode - Google Patents

Full optical fibre shift light pulse sequence compression-expansion mode Download PDF

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CN1414728A
CN1414728A CN01136695A CN01136695A CN1414728A CN 1414728 A CN1414728 A CN 1414728A CN 01136695 A CN01136695 A CN 01136695A CN 01136695 A CN01136695 A CN 01136695A CN 1414728 A CN1414728 A CN 1414728A
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CN1264297C (en
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杨理
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Graduate School of CAS
University of Chinese Academy of Sciences
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Abstract

A pulse sequence companding mode of all-optical fibre displacement type uses a symmetric double-ring system which has a very strong self-compensation ability, such as loss compensation, phase compensation and density compensation, and at the same time, it can be conveniently used for the channels with code rate and carrier frequency in difference through requlating the equivalent ring length. The prsent invention firstly realizes that the physical transmission of communication system can carry out the free regulation indendently beyond the part of detection and control in a certain degree.

Description

Denomination of invention full optical fibre shift light pulse sequence compression-expansion mode
Technical field
What the present invention relates to is the full optical fibre shift light pulse sequence compression-expansion mode.
Prior art
The multiple connection mode (G.707-G.709 waiting) that CCITT (CCITT) is advised about SONET (synchronous optical network) and SDH (synchronous digital hierarchy) is to insert the multiple connection mode by word, when promptly requiring multiple connection tributary binary digits is carried out the fast conversion of sign indicating number for per 8 one group, by branch road code check B 1Become main line code check B 2, to distribute in each time slot of this branch road so that send into the main line, this process is called the sequence compression process; Conversely, when being tapped into branch road by the main line, code stream also has one yard fast transformation problem, is B by code check in the main line promptly 2Per 8 one group paroxysm sequence of symhols be transformed to that code check is B in the branch road 1Continuous bit stream, this process is called sequence extension.The related fast conversion of sign indicating number of the above-mentioned suggestion of CCITT generally is that the mode by electricity realizes.Because the response speed of electronic logic device can not satisfy the needs of fiber optic communication network in the future, connect and switching technology so be necessary to develop full recovery, comprising full Optical Time Division Multiplexing (OTDM) technology.Obviously, the elementary cell that can't avoid is exactly full light sign indicating number speed transformation problem in the OTDM technology.In addition, ATM(Asynchronous Transfer Mode) also has the problem of compression of sequence and expansion: 48 bytes " payload " of each cell are by the tributary binary digits compression in the main line, so develop the full optical pressure that full light atm technology also must at first solve sequence of symhols and contract-scaling problem.
Existing OTDM experimental system all is the multiple connection mode of taking by the bit insertion, and not seeing has the report that inserts the OTDM experimental system by word, and ATM then realizes by the electronic logic device.The full optical pressure of the light pulse sequence of having reported in the world contracts-and expanding unit is to be made of the fibre delay line of the fiber optic splitter of cascade and various different lengths and optically controlled optical switch, its complex structure, deviation is wayward, is difficult to adapt to various applied environment and system.
The present invention is exactly a kind of technical scheme of the full light sequence compression-scaling problem proposition of required solution during at technology such as current development OTDM and full light ATM.Content of the present invention comprises light path part, control signal generating portion and working method part.
Summary of the invention
The object of the present invention is to provide a kind of compression-expansion mode of full optical fibre shift light pulse sequence.
Below be that compression-expansion mode of the present invention is described in detail,, can be expressly understood the present invention by following description and in conjunction with later accompanying drawing.
Particular content of the present invention is as follows.
One, light path part
Light path part major technique feature of the present invention is the long l of equivalence ring in described various situations Press, l ExpandMust satisfy
Figure A0113669500061
V wherein gBe the group velocity of light pulse in the optical fiber, B 1Be the branch road chip rate, natural number N is the compression multiple of code stream, and KN is the actual local compression ratio of code stream, and natural number m is the ratio of ring length with branch road code element distance.
(1) the long constant situation of ring
The simplest situation is shown in accompanying drawing 1a, and existing is that example is illustrated with light path shown in the accompanying drawing 2a.
Compression section: shown in accompanying drawing 2a, have mixer C and optical switch S on the fiber optic loop, tributary binary digits enters fiber optic loop by the A end through C, and stack gradually is B by code check in the process that detours 1Continuous bit stream to become code check be main line code check B 2=NB 1The paroxysm code stream that is suitable for main line transmission, electrooptical switching S periodically outputs to the B end with compressed code flow under the driving of control section (seeing " summary of the invention three (2) "), injects in the particular time-slot on main line.
Expansion: its light path is identical with compression section.
Code check in the part time slot of main line is B 2The paroxysm code stream be coupled into fiber optic loop by A end through C, control signal drives the code stream that S (seeing " summary of the invention three (3) ") will go into ring and little by little is coupled out from the B end in the process that detours, and recovers original tributary signal and flows.Detailed process is referring to " embodiment one ".
(2) the long adjustable situation of ring
The simplest situation is shown in accompanying drawing 1b, and existing is that example is illustrated with light path shown in the accompanying drawing 2b.
Compression section: shown in Fig. 2 b, adding Variable delay line AD in " the long constant situation of ring " light path can make the equivalence ring long in variation (being equivalent to 200ps on the time approximately) within some centimetres by regulating AD, and its effect is:
A. guarantee l Press=l Expand, to reduce requirement to boxing system precision;
B. can freely select " increasing one " and " subtracting one " two kinds of working methods;
C. can make same ring be applicable to different v gAnd B , the system of promptly different carrier frequency and branch road code check;
D. can be used for variable faint non-homogeneous compression, the main line code stream is had be independent of the confidentiality that detects control;
E. be used for non-homogeneous compression, so that insertion system information.
Expansion: light path is identical with the compression section light path.
(3) contain the compression ring and the expanded ring light channel structure compression section of optically controlled optical switch:
A. in " the long constant situation 2 of ring " S is replaced by optically controlled optical switch, light channel structure contains mixer C in the 8 word optical fiber cavities shown in Fig. 3 a at this moment 1, isolator ISO, beam splitter C 2, 50/50 coupler S 1, nonlinear crystal NLE, Variable delay line AD and the wavelength division multiplexer S that control signal CT is coupled into and is coupled out 2
Tributary binary digits is held the C that flows through by A 1Go into ring, under the control at CT after superposeing for N time through S 2Flow to C counterclockwise 2, a part is injected the main line assigned timeslot from the B end after the beam splitting, and a part disappears after flowing to waveguide isolator ISO;
B. in " the long adjustable situation 2 of ring " S is taken as optically controlled optical switch, this moment, light channel structure was at C with the difference of " a " middle light path 1And add a Variable delay line (referring to accompanying drawing 3b) between the ISO;
Expansion light path (comprising two kinds of situations of a, b) is corresponding identical with the compression section light path, and difference only is to control light signal difference (referring to accompanying drawing 4a, 4b).
(4) this situation of compression-expanded ring light channel structure that contains erbium-doped fiber amplifier (EDFA) requires EDFA to make ring be operated in (but being lower than threshold values) near the threshold values.
A. corresponding with " the long constant situation of ring ", in light path, add an EDFA to offset the loss that C, S cause, shown in accompanying drawing 1c, 2c.The compression ring light path is identical with the expanded ring light path.
B. corresponding with " the long adjustable situation of ring ", in light path, add a vairable delay line AD, shown in accompanying drawing 1d, 2d, the compression ring light path is identical with the expanded ring light path.
C. corresponding with employing optically controlled optical switch situation:
C1. " the long constant situation of ring " adds optically controlled optical switch and EDFA: changing ISO into EDFA in the light path shown in the accompanying drawing 3a;
C2. " the long adjustable situation of ring " adds optically controlled optical switch and EDFA: changing ISO into EDFA in the light path shown in the accompanying drawing 3b;
C3. in situation c1 light path with beam splitter C 2Change fiber optical circulator into;
C4. at situation c 3In the light path with C 1And add a vairable delay line AD between the EDFA.
Two, working method
Compression ring has three kinds of fundamental modes in OTDM and full light ATM:
When (1) the branch road code check is low, can adopt the compress mode that does not change the code element order, the sequence after compression this moment has and the identical line code of compression presequence, and all even non-homogeneous two kinds of compress modes are also arranged this moment;
(2) the branch road code check is very high, but closes the road when giving each branch road distributed time slot long (as the full light ATM and the OTDM of insertion frame by frame), can take the even compress mode of element interleaving formula;
(3) the branch road code check is very high, and closes the time slot (as press the OTDM of word insertion) more in short-term of giving branch road in the road, can adopt the non-homogeneous compress mode of element interleaving formula.
Expanded ring also has corresponding three kinds of working methods.
In fact realize the long l of (no matter at compression section or at expansion) just equivalent ring, control signal of telecommunication period T and these three physical quantitys of control signal high level lasting time (pulse duration) τ of the required change of conversion between these three kinds of working methods.Some other communication system parameter that relates in this tittle and the present technique must satisfy following relation:
(1) l Press=l Expand,
(2) T Press=NmT Expand,
(3) τ Press=Nm τ Expand,
Figure A0113669500071
Figure A0113669500082
B wherein =B 1Be branch road code check, v gBe the group velocity of light pulse in the optical fiber, natural number N is the compression multiple of code stream, and KN is the actual local compression ratio of code stream, and natural number m is the ratio of ring length with branch road code element distance, and the corresponding relation of positive real parameter K and natural number m and three kinds of working methods is as follows:
(1) m＞1 is the compression of element interleaving formula, wherein:
K ≠ 1 is the doubly non-homogeneous compression of K,
K=1 is evenly compression;
(2) m=1 is for keeping the line code compression, wherein:
K ≠ 1 is the doubly non-homogeneous compression of K,
K=1 is evenly compression.In the formula (6)+,-number respectively with increase a working method and subtract a working method corresponding.
Three, the electric control optical switch control signal obtains
(1) precondition of Shi Shiing
A. the mode of taking existing step-by-step multiple connection OTDM system to be taked makes the branch road optical signal pulses enough narrow before tandem, is unlikely to take place the main line signal aliasing phenomenon that causes owing to the pulse that enters the main line is wide;
B. take timing and simultaneous techniques in the existing step-by-step multiple connection OTDM technology, the local area network (LAN) clock signal of branch road is aimed at the backbone network clock signal forward position on main line;
C. adopt the high frequency logic processing apparatus that is adopted in the existing step-by-step multiple connection OTDM technology, comprise integrated circuit, integrated waveguide and device for non-linear optical etc.
(2) generation of compression ring control signal
Signal generates scheme referring to accompanying drawing 5a, control signal (CT) 1See accompanying drawing 5b with the relation of time t.
(3) generation of expanded ring control signal
Signal generates scheme referring to accompanying drawing 5c, control signal (CT) 2See accompanying drawing 5d with the relation of time t.
Four, the generation of optically controlled optical switch control signal
(1) control signal light source: mode locking semiconductor laser must satisfy pulse recurrence rate=B2, and operation wavelength is the response wave length of nonlinear crystal NLE, and does not wait with the data-signal wavelength; Other requires also to require consistent with standard NOLM (nonlinear optical fiber annular chamber mirror);
(2) compression control signal: the compression control signal of telecommunication that will send into electrooptical switching is originally sent into electrooptic modulator earlier, and the modulation repetition rate is B 2, by the regular light pulse sequence of control signal light source output, the light pulse sequence after the modulation is sent into optically controlled optical switch as the CT signal as compression control signal;
(3) expansion control signal: need only be with pulsewidth≤1/ (2B 2), repetition rate is that the regular light pulse sequence of B1 is sent into optically controlled optical switch and got final product as the CT signal.
To add a vairable delay line in above-mentioned (2), (3) two parts light path, so that make control signal and data-signal synchronous.And (2) corresponding light path is for to add an optical fibre variable delay line AD at (between L and the M) on the light path shown in accompanying drawing 3a, the 3b; With (3) corresponding light path such as accompanying drawing 4a, shown in the 4b.
Embodiment
Below be embodiments of the present invention,, can understand the present invention further in conjunction with above-mentioned detailed description of the present invention.
Embodiment one
Present embodiment illustrates full optical fibre shift light pulse sequence compression-expansion mode of the present invention in the simplest mode.
1. the even compression scenario with " the long constant situation 2 of ring " is an example explanation compression ring operation principle
The tributary binary digits that is coupled into ring by mixer C arrives switch S, if switch S places the not state of coupling outside ring, code stream will constantly detour in ring, makes the equivalence ring cover with foot if make fiber optic loop
Figure A0113669500091
N wherein, m is two natural numbers, by system design decision, v gBe the group velocity of light signal in optical fiber, B 1Be the branch road code check; If first enters bit code S headed by the code element in the ring 1, work as S 1Arrive C once more and q/N (the q=v that moves forward g/ B 1Be the code element distance) time, m+1 code element S in the tributary binary digits M+1Just arrive C, so subsequent symbol will be connected on S one by one 2, S 3Afterwards, and move q/N all, worked as S M+1When arriving C once more and moving forward q/N, 2m+1 code element S 2m+1Just enter in the ring by C, and the like, S worked as 1When the N time process C also moves forward (N-1) q/N, S (N-1) m+1Just arrive C, and enter in the ring, begin at S thus 1Forming gradually afterwards, the code check of lengthening is NB 1Even code stream.
Work as S 1When arriving switch S the N time, control signal places couple state outside ring with S, with S1 and subsequent symbol (S thereof M+1, S 2m+1) guide to outside the ring, work as S NmBy S from the ring come out after, control signal just places S not output state, S Mx+1Code element and subsequent symbol thereof will detour in ring, and forming code check gradually is NB 1Code stream, and the S that draws 1, S M+1, S 2m+1... S 2, S 2m+2... S NmConstitute the main line and distribute to burst in first time slot of this branch road, its code check is NB 1
With S Mx+1Treat as S 1, repeating said process, the interior burst of second time slot of this branch road is distributed on promptly exportable main line.Control section is seen " summary of the invention three (2) ".
2. the even compression scenario with " the long constant situation 2 of ring " is an example explanation expanded ring operation principle
Expanded ring is identical with the compression ring light channel structure, but the control mode difference.Work as B Do=B 2=NB 1Main line code stream when entering expanded ring, establish the first sign indicating number and be S ' 1Encircle long because of expanded ring is equivalent this moment and the compression ring equivalence encircles appearance together, and { seeing summary of the invention three (3) } when control section is 1/B with the cycle 1, width is 1/B 2Regular periodic signal (CT) 2Switch S is placed outside ring during couple state, just in time one by one with S ' 1, S ' N+1, S ' 2N+1Outside the output ring, this is exported just corresponding to original S 1, S 2, S 3Tributary binary digits, thus kept the contained information of former tributary binary digits constant.
3. " increase a working method " and " work in combination mode "
Aforementioned various working method all belongs to " subtracting one " working method, and promptly the fiber optic loop equivalent length is got l = ( m - 1 KN ) v g 1 B 1 . If get l = ( m + 1 KN ) v g 1 B 1 , Sm+1 then can occur and come S 1Before, S 2m+ 1 comes S mBefore+1 ... situation.As long as l Press=l Expand=l can realize the various functions that " subtracting one " working method can realize equally.This is " increasing one " working method.The control section of the working method that " increases " is identical with " subtracting one " working method.
The work in combination mode: compress, increase when getting the mode that subtracts that a mode is expanded or when opposite, some that can realize sequence code element order are reset functions (comprising inversion); Or the like.This moment, control section was identical with " increasing one " or " subtracting one " working method respectively.
In full optical fibre shift light pulse sequence compression-extended mode of the present invention, the researcher also studies following problem:
A. about the self-compensating problem of non-homogeneous compression-expansion and the long deviation of ring
1. non-homogeneous compression
When K＞1, boil down to is heterogeneous, and the sequence of symhols of promptly finally importing the main line time slot is not to occupy this time slot equably, but concentrates on the front portion (subtracting a working method) of this time slot or concentrate on the rear portion (increasing a working method) of this time slot.The even compression control mode of the control mode that realizes this non-homogeneous compression during with K=1 is identical.
2. the expansion of non-homogeneous compression
Need only get l Expand=l Press, i.e. K Expand=K Press, the extended control mode when this extended control mode and even compression is identical, can regain the original continuous information stream of this branch road, and recover its uniformity simultaneously.
3. encircle the self-compensating of long deviation
Do not contain the ring of AD (Variable delay line) for aforementioned multiclass,, can only guarantee to encircle long error delta l≤1mm, therefore, be difficult to obtain accurately to satisfy because welding precision is limited
Figure A0113669500103
Ring.And when temperature changed, ring is long also to change thereupon, therefore the long l that departs from of ring EquivalenceBe ubiquitous.
But, consider, as long as l for any K 〉=1 Press=l Expand, all can correctly recover the branch road information flow, therefore the long error delta l of ring can be considered as that a changes delta K by K causes, that is:
Figure A0113669500104
Therefore as long as l ' Press=l ' ExpandGet final product.Because control section and K are irrelevant, therefore do not encircled the influence of long deviation fully.
A. weld the system problem: can choose a pair of long approximately equalisedly to encircling in batch process, this moment, precision greatly improved naturally;
B. temperature effect problem: l Press, l ExpandUnsuitable long, guarantee that simultaneously enforcement pressure, expansion 2 are operated under the same temperature.
B. about soliton signal stream being carried out the problem of the fast conversion of sign indicating number
Orphan's communication system belongs to intensity modulated-direct pulse digit communication system that detects (IM/DD), so this programme can be used for soliton signal stream is carried out the fast conversion of sign indicating number.Since soliton pulse mutually near the time can very complicated non-linear repulsion, the sucking action of pests occurrence rule, many in the world in recent years researchers have proposed the interactional method of a series of orphans of weakening, and wherein simple, effective two methods are with anisometric soliton pulse or the alternate transmission of not equiphase soliton pulse.Yet it is complicated that these two methods remain when carrying out.The work of this respect at present only rests on the stage of computer simulation basically.
When the present invention is used for the conversion of orphan's code stream, be able to realize not constant amplitude naturally, do not wait phase orphan's alternate transmission, thereby the result of study of orphan's code stream dynamic evolution over having utilized naturally surplus in the of ten year, with the interaction that has the optical path loss of negative consequence and additional optical distance to become originally can to weaken between orphan's code element to increase the active factor of main line code check.Its detailed process is as follows:
A. loss problem
At compression stage, because at first going into m code element of ring must detour and add half cycle N-1 week and just go out to encircle, and m the code element of the going into ring at last half cycle that need only detour can go out to encircle, therefore adjacent orphan's code element is because detour all number differences thereby loss difference, cause the amplitude difference, promptly the amplitude of the adjacent orphan's code element in the main line is different.
In extension phase, all numbers that detours during compression are many just in time is coupled out ring earlier, thereby loss is little; What all numbers that detours during compression were minimum goes out to encircle at last, thereby the loss maximum.So the difference of amplitude corresponding compensation of having got back when entering branch road.
B. phase problem
If do not consider the problem of warbling of optical soliton source, each orphan's initial phase can be taken as equal constant in the optical soliton sequence.When being in the first code element S 1Transmitted l EquivalenceWhen distance comes back to the end points of ring, S 1More just gone into the S of ring M+1An additive phase Δ φ is arranged; S as can be known in like manner M+1Than S 2m+1One additive phase Δ φ is also arranged, or the like.
Standard fiber orphan (non-linear Schrodinger equation list orphan separates) can be written as: q ( T , Z ) = η sech ηTe i 2 η 2 Z , If get η ≈ 1, easily know Δ φ ≈ l Equivalence/ 2, note l herein EquivalenceUnit be the nondimensionalization unit length of optical fiber.The pairing Z=1 of 20ps pulse is equivalent to 100km with regard to existing dispersion shifted optical fiber.Because l EquivalenceGenerally in the 10m magnitude, so Δ φ-5 * 10 -5, therefore as long as ring is not too big, or pulse is not too narrow, just differing Δ φ can omit.
On the other hand, because adjacent orphan's amplitude difference causes the orphan to produce a phase difference in the process of main line long-distance transmissions.Equally for 20ps pulsewidth orphan, since Δ η～0.1 (for the device that does not contain EDFA), Δ (1/2 η 2)～0.1, and the total length L T of system～10 2-10 3, therefore (Δ φ) Develop～10-10 2Be that the phase difference between the adjacent not constant amplitude orphan will change between 0 to 2 π once surplus ten time in the evolutionary process, this can weaken the interaction between adjacent orphan effectively, therefore can suitably increase main line orphan's width, thereby can increase the spacing of main line image intensifer---the too small difficulty of image intensifer spacing when this has just alleviated orphan's Communication System Design to a certain extent.
The technical characterictic of full optical fibre shift light pulse sequence compression of the present invention and extended mode can be summarized as follows:
(1) one of compress mode of the present invention is to utilize fiber optic loop that contains electrooptical switching and the synthesized signal generator of controlling electrooptical switching, realizes the compression of signal flow in time domain by the displacement superimposing technique.The displacement superimposing technique is meant that choosing fiber optic loop equivalence ring length is Wherein N, m are natural number, v gBe the group velocity of light pulse, B Be the branch road bit rate, the control electricity consumption pulse period is Width is
Figure A0113669500123
Electrooptical switching is in incorgruous couple state during high level.
(2) two of compress mode of the present invention is to utilize fiber optic loop and the control electrooptical switching synthesized signal generator that contains electrooptical switching and optical combiner, realizes the compression of signal flow in time domain by the displacement superimposing technique.The displacement superimposing technique is meant that choosing optical fibre delay loop equivalence ring length is Wherein real parameter K is greater than 1.Choose the synthesized signal generator signal period as (F2) formula, width is as (F3) formula, and electrooptical switching is in incorgruous couple state during high level.
(3) three of compress mode of the present invention is the control optical pulse streams that utilize the 8 font optical fiber that contain optical combiner, beam splitter, waveguide isolator, vairable delay line and devices such as wavelength division multiplexer and nonlinear crystal to postpone chamber and the instantaneous refractive index of control nonlinear crystal, realizes the compression of signal flow in time domain by the displacement superimposing technique.The displacement superimposing technique is meant long as (F4) formula of 8 word chamber equivalent cavity of choosing, the control optical pulse stream is that the duty ratio regular optical pulse stream identical with bit period of the sequence after response wave length (being different from the signal flow wavelength), duty ratio and bit period and the compression of used nonlinear crystal generates by electrooptic modulator by wavelength, electrooptic modulator is controlled by synthesized signal generator, the signal period of synthesized signal generator, width was as (F3) formula as (F2) formula.Electrooptic modulator is in logical light state during high level.
(4) one of extended mode of the present invention is to utilize to contain fiber optic loop that electric light opens the light and the synthesized signal generator of control electrooptical switching is realized the expansion of signal flow in time domain by the displacement technology that picks.The displacement technology of picking is meant that choosing fiber optic loop equivalent cavity length is
Figure A0113669500131
Wherein N, m are natural number, get control earlier with the synthesized signal generator signal period to be
Figure A0113669500132
Width is
Figure A0113669500133
(5) two of extended mode of the present invention is to utilize fiber optic loop and the control electrooptical switching synthesized signal generator that contains electrooptical switching and optical combiner, realizes the expansion of signal flow in time domain by the displacement technology that picks.The displacement technology of picking is meant that choosing fiber optic loop equivalent cavity length is Wherein real parameter K is greater than 1; Choose the synthesized signal generator signal period as (F6), width is as (F7) formula.
(6) three of extended mode of the present invention is to utilize 8 font optical fiber cavities that contain vairable delay line, optical combiner, beam splitter, waveguide isolator and devices such as wavelength division multiplexer and nonlinear crystal and the control optical pulse stream of controlling the instantaneous refractive index of nonlinear crystal, realizes the expansion of signal flow in time domain by the displacement technology that picks.The displacement technology of picking is meant chooses long as (F8) formula of 8 word chamber equivalent cavity, and the control optical pulse stream is made of regular optical pulse stream, and its wavelength is the response wave length (being different from the signal flow wavelength) of nonlinear crystal, and repetition rate is that B props up, and pulsewidth is
(7) press word (or frame by frame) and insert the required full light mapping mode of chip rate among OTDM and the full light ATM, it is characterized in that some branch road employing is compressed tributary binary digits as the compress mode described in above-mentioned (1), (2), (3) at optical networking convergence point place, corresponding branch road employing is expanded as the signaling stream poised for battle of the extended mode described in above-mentioned (4), (5), (6) at the tapping point place, and keeps every pair of compression chamber and extended cavity equivalent cavity appearance etc.
(8) be used to change mapping mode outside the chamber of pulse laser pulse recurrence rate, it is characterized in that utilizing above-mentioned (1), (2), (3) described mode that the optical pulse stream of coupled into optical fibres is compressed to generate high-repetition-rate paroxysm optical pulse stream or utilize above-mentioned (4), (5), (6) described mode to expand to the paroxysm optical pulse stream of coupled into optical fibres and generate the low repeatability optical pulse stream;
(9) generation of P-breather stream is the method for utilizing described in above-mentioned (1), (2), (3), and gets
Figure A0113669500136
Wherein P is the natural number less than N.
(10) generation of N-breather stream is a mode described in above-mentioned (2), (3), and gets K ≥ 1 + 1 / N .
(11) production method of optical soliton-breather stream is characterized in that mode produces P-breather stream described in (9), sends into electrooptic modulator then and produces such as by 101 ... periodicity optical soliton-breather code stream that 1 (P-2 continuous 1) constitutes.
(12) generation of optical soliton-breather stream produces N-breather stream as above-mentioned (10), sends into electrooptic modulator and produces such as by 101 ... periodicity optical soliton-breather code stream that 1 (N-2 continuous 1) constitutes.
(13) make fiber optic communication network physical channel main line code element instantaneous velocity can be independent of signal source, multiple connection control and detect and carry out freely regulated mode in the certain limit, described in above-mentioned (7), (do not comprise and relate to claim (1), regulate the long l of equivalent cavity by required real parameter K during content (4)), tandem-tap mode Press, l Expand
(14) be used for the mode of secure communication, as described in (13), transmit real parameter K by hidden passageway, at tandem, tapping point place simultaneously according to the secret long l of equivalent cavity that regulates of K Press, l Expand
(15) overhead nature inserted mode is to utilize above-mentioned (13) described, by the selected real parameter K of amount of overhead, regulates the long l of equivalent cavity according to K simultaneously at tandem, tapping point place Press, l Expand
(16) anti-to close road error burst mode be after tributary signal stream is carried out anti-random error error correction coding, gets as tandem-tap mode as described in above-mentioned (7).
(17) realize that naturally the orphan that soliton communication system is closed in the code stream of road is that tandem-tap mode that constant amplitude is not adjacent can utilize the content of above-mentioned (7) to realize.
(18) add vairable delay line or erbium-doped fiber amplifier on the optic fiber ring-shaped cavity that above-mentioned (1), (2), (4), (5) described mode relate to, or the both adds.
(19) add vairable delay line (in containing the annular chamber of waveguide isolator) in the 8 word optical fiber cavities that above-mentioned (3), (6) described mode relate to, or change waveguide isolator into erbium-doped fiber amplifier, or both added vairable delay line, change waveguide isolator into erbium-doped fiber amplifier again.
(20) utilize above-mentioned (18), (19) described mode can reach the purpose of above-mentioned (7) to (17).
The present invention realizes full optical pressure contracting and the expansion of light pulse sequence with a kind of brand-new thinking, its advantage is many-sided:
(1) can meet the needs of OTDM and the full optical pressure contracting-expansion of full light ATM burst.
(2) symmetrical bicyclic system has very strong oneself and compensates function, comprises loss balancing, phase compensation and density compensation.
(3) can be applicable to easily the channel of different code checks and carrier frequency by regulating equivalence ring length.
(4) synchronously regulate the equivalence ring of compression ring and expanded ring long, can under the condition that does not change control signal, make main line signal stream that the variation of density occur, thereby make general listener-in be difficult for obtaining correct information.
(5) compression of element interleaving formula makes the main line signal stream of making anti-random error Error Correction of Coding have anti-error burst function.
(6) in non-homogeneous compression situation, clock, the information such as synchronous can be inserted naturally.
(7) the code element momentary rate that has realized for the first time physical channel can be independent of to a certain extent and detect control section and regulate.
(8) the present invention is transparent to a series of branch road code checks and branch road code element in a small amount of drift of time domain.
Description of drawings
Accompanying drawing 1-4 is compression ring of the present invention and expanded ring structural representation;
Accompanying drawing 1a. " the long constant situation 1 of ring " compression (expansion) ring structure schematic diagram;
Accompanying drawing 1b. " the long adjustable situation 1 of ring " compression (expansion) ring structure schematic diagram;
Accompanying drawing 1c. " the long constant situation 1 of ring " (containing EDFA) compression (expansion) ring structure schematic diagram;
Accompanying drawing 1d. " the long adjustable situation 1 of ring " (containing EDFA) compression (expansion) ring structure schematic diagram;
In the above-mentioned accompanying drawing, S is an electric control optical switch, and P is a synthesized signal generator, and AD is the optical fibre variable delay line, and EDFA is an erbium-doped fiber amplifier, and signal flow is held output by the input of A end, B.
Accompanying drawing 2a. " the long constant situation 2 of ring " compression (expansion) ring structure schematic diagram;
Accompanying drawing 2b. " the long adjustable situation 2 of ring " compression (expansion) ring structure schematic diagram;
Accompanying drawing 2c. " the long constant situation 2 of ring " (containing EDFA) compression (expansion) ring structure schematic diagram;
Accompanying drawing 2d. " the long adjustable situation 2 of ring " (containing EDFA) compression (expansion) ring structure schematic diagram;
In the above-mentioned accompanying drawing, C is the optical fiber mixer, and all the other are with accompanying drawing 1.
The light-operated compression ring structural representation of accompanying drawing 3a. " the long constant situation 2 of ring ";
The light-operated compression ring structural representation of accompanying drawing 3b. " the long adjustable situation 2 of ring ";
The light-operated expanded ring structural representation of accompanying drawing 4a. " the long constant situation 2 of ring ";
The light-operated expanded ring structural representation of accompanying drawing 4b. " the long adjustable situation 2 of ring ";
In the above-mentioned accompanying drawing, C 1Be optical fiber mixer, C 2Be fiber optic splitter, ISO is a fibre optic isolater, S 1Be 50/50 fiber coupler (operation wavelength is a signal light wavelength), S 2Be 0/100 fiber coupler (operation wavelength is the control optical wavelength), NLE is a nonlinear crystal, and L is a pulse laser, and M is an electrooptic modulator, and all the other are with accompanying drawing 1.
Accompanying drawing 5 is to generate the scheme schematic diagram (5a, 5c) of control signal CT and the graph of a relation (5b, 5d) of CT and time t in the compression-expansion mode of the present invention;
Accompanying drawing 5a. compression ring control signal generates the scheme schematic diagram.Input CP is the branch clock signal;
The graph of a relation of accompanying drawing 5b. compression ring control signal and time t.T 1=1/B Be the branch clock pulse signal cycle;
Accompanying drawing 5c. expanded ring control signal generates the scheme schematic diagram.Input CP is the main line clock signal;
The graph of a relation of accompanying drawing 5d. expanded ring control signal and time t.T 2=1/B DoBe the main line clock pulse signal cycle.

Claims (5)

1. full optical fibre shift light pulse sequence compression-expansion mode is characterised in that:
(1) utilizes fiber optic loop that contains electrooptical switching and the synthesized signal generator of controlling electrooptical switching, realize the compression of signal flow in time domain by the displacement superimposing technique.The displacement superimposing technique is meant that choosing fiber optic loop equivalence ring length is
Figure A0113669500021
Wherein N, m are natural number, v gBe the group velocity of light pulse, B Be the branch road bit rate, the control electricity consumption pulse period is Width is Electrooptical switching is in incorgruous couple state during high level.
(2) utilize fiber optic loop and the control electrooptical switching synthesized signal generator that contains electrooptical switching and optical combiner, realize the compression of signal flow in time domain by the displacement superimposing technique.The displacement superimposing technique is meant that choosing optical fiber prolongs and know ring equivalence ring length and be Real parameter K 〉=1 wherein.Choose the synthesized signal generator signal period as (F2) formula, width is as (F3) formula, and electrooptical switching is in incorgruous couple state during high level;
(3) utilize 8 font fiber optic loop that contain optical combiner, beam splitter, waveguide isolator, vairable delay line and devices such as wavelength division multiplexer and nonlinear crystal and the control optical pulse stream of controlling the instantaneous refractive index of nonlinear crystal, realize the compression of signal flow in time domain by the displacement superimposing technique; The displacement superimposing technique is meant long as (F4) formula of 8 word chamber equivalent cavity of choosing, the control optical pulse stream is that the duty ratio regular optical pulse stream identical with bit period of the sequence after response wave length (being different from the signal flow wavelength), duty ratio and bit period and the compression of used nonlinear crystal generates by electrooptic modulator by wavelength, electrooptic modulator is controlled by synthesized signal generator, the signal period of synthesized signal generator, width was as (F3) formula as (F2) formula; Electrooptic modulator is in logical light state during high level;
(4) utilize and to contain fiber optic loop that electric light opens the light and the synthesized signal generator of control electrooptical switching is realized the expansion of signal flow in time domain by the displacement technology that picks.The displacement technology of picking is meant that choosing optical fibre delay loop equivalent cavity length is
Figure A0113669500025
Wherein N, m are natural number, get control earlier with the synthesized signal generator signal period to be Width is
Figure A0113669500031
(5) utilize fiber optic loop and the control electrooptical switching synthesized signal generator that contains electrooptical switching and optical combiner, realize the expansion of signal flow in time domain by the displacement technology that picks.The displacement technology of picking is meant that choosing fiber optic loop equivalent cavity length is Real parameter K 〉=1 wherein; Choose the synthesized signal generator signal period as (F6), width is as (F7) formula;
(6) utilize 8 font fiber optic loop that contain vairable delay line, optical combiner, beam splitter, waveguide isolator and devices such as wavelength division multiplexer and nonlinear crystal and the control optical pulse stream of controlling the instantaneous refractive index of nonlinear crystal, realize the expansion of signal flow in time domain by the displacement technology that picks; The displacement technology of picking is meant chooses long as (F8) formula of 8 word chamber equivalent cavity, and the control optical pulse stream is made of regular optical pulse stream, and its wavelength is the response wave length (being different from the signal flow wavelength) of nonlinear crystal, and repetition rate is B , pulsewidth is τ Expand
2. mode according to claim 1 is characterized in that:
(1) adopt described compress mode that tributary binary digits is compressed at a certain branch road in optical fiber telecommunications system convergence point place, adopt described extended mode that part main line code stream is expanded at this branch road of tapping point place, and keep every pair of compression chamber and extended cavity equivalent cavity appearance etc.;
(2) utilize described mode that the regular optical pulse stream of coupled into optical fibres is compressed to generate high-repetition-rate paroxysm optical pulse stream or utilize described mode to expand to the paroxysm optical pulse stream of coupled into optical fibres and generate the low repeatability optical pulse stream;
(3) utilize described method, and get Wherein P is the natural number less than N.
(4) mode is according to claim 1 wherein got K ≥ 1 + 1 / N ;
(5) mode produces P-breather stream according to claim 1, sends into electrooptic modulator and produces such as by 101 ... periodicity optical soliton-breather code stream that 1 (P-2 continuous 1) constitutes;
(6) mode produces N-breather stream according to claim 1, sends into electrooptic modulator and produces such as by 101 ... periodicity optical soliton-breather code stream that 1 (N-2 continuous 1) constitutes.
3. mode according to claim 1 and 2 is characterized in that:
(1) adopts described tandem-tap mode, regulate the long l of equivalent cavity by required real parameter K Press, l Expand
(2) transmit real parameter K by hidden passageway, regulate the long l of equivalent cavity according to K simultaneously at tandem, tapping point place Press, l Expand
(3) by the selected real parameter K of amount of overhead, regulate the long l of equivalent cavity according to K simultaneously at tandem, tapping point place Press, l Expand
4. according to the described mode of above any one claim, it is characterized in that tributary signal stream implemented anti-random error coding, get described tandem-tap mode, and get parameter m＞1.
5. according to any one described mode of claim 1～4, it is characterized in that in optic fiber ring-shaped cavity or 8 font chambeies, adding vairable delay line or erbium-doped fiber amplifier, or the both adds.
CNB011366958A 2001-10-26 2001-10-26 Full optical fibre shift light pulse sequence compression-expansion mode Expired - Fee Related CN1264297C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176105A (en) * 2011-03-10 2011-09-07 上海交通大学 Direct-phase-modulation-based femtosecond wideband pulse generation optical ring
WO2015100629A1 (en) * 2013-12-31 2015-07-09 华为技术有限公司 Annular optical shifter and optical signal shifting method
US9807478B2 (en) 2013-12-31 2017-10-31 Huawei Technologies Co., Ltd. Optical buffer and methods for storing optical signal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176105A (en) * 2011-03-10 2011-09-07 上海交通大学 Direct-phase-modulation-based femtosecond wideband pulse generation optical ring
CN102176105B (en) * 2011-03-10 2012-09-19 上海交通大学 Direct-phase-modulation-based femtosecond wideband pulse generation optical ring
WO2015100629A1 (en) * 2013-12-31 2015-07-09 华为技术有限公司 Annular optical shifter and optical signal shifting method
CN105556356A (en) * 2013-12-31 2016-05-04 华为技术有限公司 Annular optical shifter and optical signal shifting method
US9709744B2 (en) 2013-12-31 2017-07-18 Huawei Technologies Co., Ltd. Annular optical shifter and method for shifting optical signal
US9807478B2 (en) 2013-12-31 2017-10-31 Huawei Technologies Co., Ltd. Optical buffer and methods for storing optical signal
CN105556356B (en) * 2013-12-31 2019-02-19 华为技术有限公司 A kind of displacement method of ring light shift unit and optical signal

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