CN105790845B - Single fiber bi-directional time division multiplexing optical amplification device - Google Patents
Single fiber bi-directional time division multiplexing optical amplification device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/297—Bidirectional amplification
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Abstract
A kind of single fiber bi-directional time division multiplexing optical amplification device in optical fiber time Frequency Transfer field, including：First optical branching device, the first magneto-optic shutter, the single fiber bi-directional image intensifer without isolator, the second magneto-optic shutter, the second optical branching device and control unit.The present invention utilizes the optical direction of magneto-optic shutter and the relation of control voltage, according to the optical direction of the optical signal transmission direction controlling magneto-optic shutter detected, enter the single fiber bi-directional image intensifer of no isolator before making on Time Transmission passage to the optical signal timesharing with reverse transfers, realize with the fine same fibre with the optical signal that timing signal is carried in the two-way time division multiplexing of ripple (BTDM SFSW) Time Transmission link with ripple Bi-directional amplifier, farthest ensure link symmetry, and effectively avoid influence of the multiple amplification of the noises such as Rayleigh scattering to optical fiber time transfer performance using the unidirectional thang-kng of magneto-optic shutter.
Description
Technical field
The present invention relates to optical amplification device, specifically a kind of single fiber bi-directional time division multiplexing optical amplification device.
Background technology
High-precision Time Transmission technology is in satellite navigation, Aero-Space, survey of deep space, geological mapping, fundamental physical quantity
There is important application value in the fields such as measurement.The Time Transmission technology of satellite is currently based on, such as GPS precise point positioning methods
(PPP), two-way satellite Time Transmission (TWSTFT), the Time Transmission precision of ns magnitudes can be reached.As light clock etc. is higher steady
The invention with uncertainty Zhong Yuan is spent calmly and is put into operation, and these Transfer Technologies can not meet scientific research and social development
Demand.A kind of theoretical uncertainty can be better than the 100ps space-based Time Transmission technology based on satellite laser ranging (SLR) principle
(T2L2) at present yet in development.Although above-mentioned space-based Time Transmission technology is quite ripe or feasibility is tested
Card, but there is the shortcomings of system is complicated, costly, performance period is long, security is poor, poor reliability for their own.Optical fiber
Transmission has been obtained for being widely applied with low-loss, big bandwidth, safe and reliable advantage in the communications field.Using existing
Widely distributed Networks of Fiber Communications, it is the effective way for realizing split-second precision transmission to carry out the Time Transmission based on optical fiber
Footpath.
High-precision optical fiber Time Transmission is faced with fiber link propagation delay time and become with factors such as temperature, stress and transmission wavelengths
The problem of changing and changing.In order to realize high-precision Time Transmission, generally use at present with fine transmitted in both directions scheme.With existing light
The single fiber one-way transmission used in fiber communication network and amplifying technique are different, in order to compensate light in long-distance optical fiber Time Transmission
The transmission loss of signal, it is necessary to carry out single fiber bi-directional light amplification, single fiber bi-directional amplification turns into realizes height in Networks of Fiber Communications
One of key technology of precision two-way time transfer.Polish AGH Polytechnics propose a kind of single fiber bi-directional image intensifer [1,
P.Krehlik and L.Sliwczynski,"ELSTAB-electronically stabilized time and
frequency distribution over optical fiber-an overview,"in Frequency Control
Symposium&the European Frequency and Time Forum(FCS),2015Joint Conference of
The IEEE International, 2015, pp.761-764.], make wave filter by the way that the isolator at unidirectional EDFA both ends is changed
Realize that single fiber bi-directional amplifies, ensure that the bilateral symmetry of optical fiber time relays link propagation delay time, but the noise such as Rayleigh scattering
The multiple light amplification as caused by amplifier transmitted in both directions can severe exacerbation signal to noise ratio, limit total fiber link length [2, and J."Bidirectional Optical Amplification in Long-
Distance Two-Way Fiber-Optic Time and Frequency Transfer Systems,"
Instrumentation and Measurement,vol.62,pp.253-262,2013.].Japanese national measures institute NMIJ
[3、M.Amemiya,M.Imae,Y.Fujii,T.Suzuyama,F.-L.Hong,and M.Takamoto,"Precise
frequency comparison system using bidirectional optical amplifiers,"
Instrumentation and Measurement,IEEE Transactions on,vol.59,pp.631-640,
2010.3] a kind of bi-directional light magnification scheme towards wavelength-division multiplex (WDM) optical fiber time transmission scheme is proposed.Will using WDM
The wavelength of both direction separates, and inserts an isolator, then the method for multiplex respectively to suppress the multiple of the noises such as Rayleigh scattering
Amplification.The raising of program signal to noise ratio is, it is necessary to two-way biography on amplification link using transmitted in both directions time delay asymmetry as cost
The asymmetry of defeated time delay is demarcated, and can greatly increase implementation and the operation cost of optical fiber time transmission system, and demarcate
Overall uncertainty with amplifier number increase and transmission range extension increase；Czech CESNET [4,
V.S.a.J.Vojtěch,"Time and Frequency Transfer Using Amplified Optical Links,"
In EFTF 2014,2014, pp.325-328.] etc. the time signal of transmitted in both directions is entered using distributed raman amplifier
Row light amplification, although can to ensure that the noises such as the bilateral symmetry of chain circuit transmission time delay, Rayleigh scattering can also obtain more for single fiber
Secondary light amplification, while the problems such as low pump power height, efficiency and polarization direction of dependence input optical signal also be present.
The content of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, there is provided a kind of single fiber bi-directional optical amplification device.Should
Device can realize with fine that with ripple two-way time-multiplexed optical fiber time transmission the device has the characteristics of symmetrical height, low noise.This
Invention is by using the optical direction of magneto-optic shutter and the relation of control voltage, according to the optical signal transmission direction controlling detected
The optical direction of magneto-optic shutter, enter no isolator to the optical signal timesharing with reverse transfers before making on Time Transmission passage
Single fiber bi-directional image intensifer, realize and believe with fine with carrying timing in the two-way time division multiplexing of ripple (BTDM-SFSW) Time Transmission link
Number optical signal it is same fibre with ripple Bi-directional amplifier.
The technical solution of the present invention is as follows：
A kind of single fiber bi-directional time division multiplexing optical amplification device, its feature are that composition includes：First optical branching device, the first magnetic
Photoswitch, the single fiber bi-directional image intensifer without isolator, the second magneto-optic shutter, the second optical branching device and control unit；It is described
Control unit from left to right by the first photoelectric conversion module, the first identification module, time-sequence control module, the second identification module and
Second photoelectric conversion module forms；
The combining end of the first described optical branching device is connected with left end fiber link, a light splitting end of the first optical branching device
It is connected through an optical port with the first described magneto-optic shutter, another light splitting end and described first of the first optical branching device
The light input end mouth of photoelectric conversion module is connected, the first identification module described in the output port warp of first photoelectric conversion module
It is connected with an input port of described time-sequence control module；
The combining end of the second described optical branching device is connected with right-hand member fiber link, a light splitting of second optical branching device
End is connected with an optical port of the second described magneto-optic shutter, another light splitting end and described second of the second optical branching device
The input of photoelectric conversion module is connected, the second described identification module of the output end of second photoelectric conversion module warp with it is described
Time-sequence control module another input port be connected；
The output end of described time-sequence control module and the control terminal of the first described magneto-optic shutter and the second magneto-optic shutter
It is connected；The a port of the described single fiber bi-directional image intensifer without isolator and another light of the first described magneto-optic shutter
Port is connected, another port of described single fiber bi-directional image intensifer and another optical port of the second described magneto-optic shutter
It is connected.
The forward light for carrying timing signal that the first described optical branching device will input from the combining end of the first optical branching device
Signal is divided into two-way：Described in forward signal passes through the first described photoelectric conversion module successively all the way, the first identification module enters
Time-sequence control module, time-sequence control module output control instruction, controls described the first magneto-optic shutter and the second magneto-optic shutter
For first state from left to right, while another way forward signal passes through the first described magneto-optic shutter, not had successively from left to right
There are the single fiber bi-directional image intensifer, the second magneto-optic shutter and the second optical branching device of isolator, by the second described optical branching device
Combining end is output to right-hand member fiber link；
The backward light for carrying timing signal that the second described optical branching device will input from the combining end of the second optical branching device
Signal is divided into two-way：Described in the second described photoelectric conversion module of backward signal warp, the second described identification module enter all the way
Time-sequence control module, the output end of the time-sequence control module sends control to described the first magneto-optic shutter and the second magneto-optic shutter
System instruction, it is the second state from right-to-left to control the transmission direction of the first magneto-optic shutter and the second magneto-optic shutter optical signal；Together
When another way after to pass through the second described magneto-optic shutter, the single fiber without isolator successively to optical signal from right-to-left double
To image intensifer, the first magneto-optic shutter and the first optical branching device, left end optical fiber chain is output to by the combining end of the first optical branching device
Road.
The technique effect of the present invention is as follows：
The spy of the invention based on the optical device of maturation, determined using the optical direction of magneto-optic shutter by control voltage
Property, realized in the single fiber bi-directional image intensifer of no isolator to carrying out two-way timesharing with the fine time signal with ripple transmission
Transmission and unidirectional light amplification.
Single fiber of the present invention ensure that optical fiber time relays link propagation delay time bilateral symmetry with ripple transmission, magneto-optic shutter
One-way transmission restrained effectively the multiple amplification of the noises such as Rayleigh scattering, improve signal to noise ratio.
The present invention can be achieved with fine with the two-way time-multiplexed fiber-optic signal transmission of ripple, and the device has high symmetrical, low noise
The characteristics of sound.
Brief description of the drawings
Fig. 1 is the structural representation of single fiber bi-directional time division multiplexing optical amplification device of the present invention；
Fig. 2 is single fiber bi-directional time division multiplexing optical amplification device Bi-directional amplifier process schematic of the present invention, wherein, before (a) is
To optical signal amplification process, (b) is backward optical signal amplification process.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.Embodiment gives the detailed implementation of the present invention
Mode and specific workflow, but protection scope of the present invention is not limited to following embodiments.
, can by figure first referring to Fig. 1, Fig. 1 is the structural representation of single fiber bi-directional time division multiplexing optical amplification device of the present invention
See, single fiber bi-directional time division multiplexing optical amplification device of the present invention, composition includes：First optical branching device 1, the first magneto-optic shutter 2, do not have
The single fiber bi-directional image intensifer 3 of isolator, the second magneto-optic shutter 4, the second optical branching device 5 and control unit 6；Described control list
Member 6 is from left to right by the first photoelectric conversion module 6.1, the first identification module 6.2, time-sequence control module 6.3, the second identification module
6.4 and second photoelectric conversion module 6.5 form；
The combining end of the first described optical branching device 1 is connected with left end fiber link A, one point of the first optical branching device 1
Light end through being connected with an optical port of the first described magneto-optic shutter 2, another light splitting end of the first optical branching device 1 with it is described
The light input end mouth of the first photoelectric conversion module 6.1 be connected, the output port warp of first photoelectric conversion module 6.1 is described
First identification module 6.2 is connected with an input port of described time-sequence control module 6.3；
The combining end of the second described optical branching device 5 is connected with right-hand member fiber link B, one of second optical branching device 5
Light splitting end be connected with an optical port of the second described magneto-optic shutter 4, the second optical branching device 5 another be divided end with it is described
The input of the second photoelectric conversion module 6.5 be connected, second that the output end warp of second photoelectric conversion module 6.5 is described is known
Other module 6.4 is connected with described another input port of time-sequence control module 6.3；
The output end of described time-sequence control module 6.3 and the control of the first described magneto-optic shutter 2 and the second magneto-optic shutter 4
End processed is connected；The a port of the described single fiber bi-directional image intensifer 3 without isolator and the first described magneto-optic shutter 2
Another optical port is connected, another port of the single fiber bi-directional image intensifer 3 without isolator and the second described magnetic
Another optical port of photoswitch 4 is connected.
In embodiment, the timing signal transmitted in two-way time transfer wavelength channel is 1PPS, carries 1PPS optical signal I
Transmission direction be A to B, in Fig. 2 (a), i.e., before to the transmission direction for carrying 1PPS optical signal II is B to A, in Fig. 2
(b) it is, i.e., backward.Optical signal I and optical signal II Staggered transmittings in a link.In embodiment, photoswitch uses switching time to be micro-
1 × 1 magneto-optic shutter of second-time, when it is state I, link transmission direction be and be only before to, when it be state II link biography
Defeated direction is and is only backward；Image intensifer is free of the erbium-doped fiber amplifier (EDFA) of isolator using two ports.
From A to B, the light amplification process in direction such as (a) in Fig. 2 is shown.Optical signal I warps being transmitted from A to B, carrying 1PPS
One 1：10% optical signal is inputted control unit 6 by 9 the first optical branching device 1, remaining 90% first magneto-optic shutter 2 of input.
Control unit 6 according to before receiving into optical signal I t at the time of fixed timing mark (1PPS)1, it is determined that the first magneto-optic is opened next time
The magneto-optic shutter 4 of pass 2 and second is arranged to t at the time of state I11<t1+T-ts, wherein T is the cycle for the timing signal being passed, ts
For the switching time of magneto-optic shutter.Reaching, moment t is set11When, control unit 6 opens the first magneto-optic shutter 2 and the second magneto-optic
Close 4 and set and be simultaneously maintained at state I so that carry next time 1PPS optical signal I successively by the first magneto-optic shutter 2, without every
Single fiber bi-directional image intensifer 3, the second magneto-optic shutter 4 and the second optical branching device 5 from device, by the combining of second optical branching device 5
End is output to fiber link；
From B to A, the light amplification process in direction such as (b) in Fig. 2 is shown.The carrying 1PPS transmitted from B to A optical signal II warps
Cross one 1：10% optical signal is inputted control unit 6 by 9 the second optical branching device 5, remaining 90% second magneto-optic shutter of input
4.Control unit 6 is according to t at the time of detecting fixed timing mark (1PPS) in backward optical signal II2, it is determined that next time by the first magnetic
The magneto-optic shutter 4 of photoswitch 2 and second is arranged to t at the time of state I I21<t2+T-ts.Reaching, moment t is set21When, control is single
First magneto-optic shutter 2 and the second magneto-optic shutter 4 are set and are maintained at state I I by member 6 so that carry 1PPS light letter next time
Number II passes through the second magneto-optic shutter 4, the single fiber bi-directional image intensifer 3 without isolator, the first magneto-optic shutter 2 and the first light successively
Shunt 1, fiber link is output to by the combining end of first optical branching device 1.
From A to B, the light amplification process in direction such as (a) in Fig. 2 is shown.Optical signal I warps being transmitted from A to B, carrying 1PPS
One 1：10% optical signal is inputted control unit 6 by 9 the first optical branching device 1, remaining 90% first magneto-optic shutter 2 of input.
Control unit 6 is in the targeting signal (time difference between targeting signal and timing code start mark before detecting into optical signal I>
The switching time of number × magneto-optic shutter of amplifier in link) when, immediately by the first magneto-optic shutter 2 and the second magneto-optic shutter 4
Set and be maintained at state I so that remaining 90% optical signal I is successively by the first magneto-optic shutter 2, the single fiber without isolator
Bidirectional optical amplifier 3, the second magneto-optic shutter 4 and the second optical branching device 5, light is output to by the combining end of second optical branching device 5
Fine link B；
From B to A, the light amplification process in direction such as (b) in Fig. 2 is shown.The carrying 1PPS transmitted from B to A optical signal (II)
By one 1：10% optical signal is inputted control unit 6 by 9 the second optical branching device 5, and remaining 90% second magneto-optic of input is opened
Close 4.Control unit 6 after detecting into optical signal II targeting signal (between targeting signal and timing code start mark when
Between it is poor>The switching time of number × magneto-optic shutter of amplifier in link) when, by the first magneto-optic shutter 2 and the second magneto-optic shutter 4
Set and be maintained at state I I so that remaining 90% optical signal II passes through the second magneto-optic shutter 4, the list without isolator successively
Fine bidirectional optical amplifier 3, the first magneto-optic shutter 2 and the first optical branching device 1, are output to by the combining end of first optical branching device 1
Fiber link A.
Claims (2)
- The optical amplification device 1. a kind of single fiber bi-directional is time-multiplexed, is characterised by that its composition includes：First optical branching device (1), first Magneto-optic shutter (2), the single fiber bi-directional image intensifer (3) without isolator, the second magneto-optic shutter (4), the second optical branching device (5) and Control unit (6)；Described control unit (6) is from left to right by the first photoelectric conversion module (6.1), the first identification module (6.2), time-sequence control module (6.3), the second identification module (6.4) and the second photoelectric conversion module (6.5) composition；The combining end of described the first optical branching device (1) is connected with left end fiber link (A), one of the first optical branching device (1) Light splitting end be connected with an optical port of described the first magneto-optic shutter (2), the first optical branching device (1) another light splitting end and The light input end mouth of described the first photoelectric conversion module (6.1) is connected, the output port of first photoelectric conversion module (6.1) It is connected through described the first identification module (6.2) with an input port of described time-sequence control module (6.3)；The combining end of described the second optical branching device (5) is connected with right-hand member fiber link (B), and the one of second optical branching device (5) Individual light splitting end is connected with an optical port of described the second magneto-optic shutter (4), another light splitting end of the second optical branching device (5) It is connected with the input of described the second photoelectric conversion module (6.5), the output end of second photoelectric conversion module (6.5) is through institute The second identification module (6.4) stated is connected with another input port of described time-sequence control module (6.3)；The output end of described time-sequence control module (6.3) and described the first magneto-optic shutter (2) and the second magneto-optic shutter (4) Control terminal is connected；The a port of the described single fiber bi-directional image intensifer (3) without isolator is opened with the first described magneto-optic Close (2) another optical port be connected, another port of the single fiber bi-directional image intensifer (3) without isolator with it is described Another optical port of the second magneto-optic shutter (4) be connected.
- The optical amplification device 2. single fiber bi-directional according to claim 1 is time-multiplexed, it is characterised in that：The first described light point The forward direction optical signal of the carrying timing signal inputted from the combining end of the first optical branching device (1) is divided into two-way by road device (1)：All the way Forward signal enters described SECO through described the first photoelectric conversion module (6.1), the first identification module (6.2) successively Module (6.3), time-sequence control module (6.3) output control instruction, controls described the first magneto-optic shutter (2) and the second magneto-optic (4) are switched as first state (I) from left to right, while pass through described first successively from left to right to optical signal before another way Magneto-optic shutter (2), single fiber bi-directional image intensifer (3), the second magneto-optic shutter (4) and the second optical branching device (5) without isolator, Right-hand member fiber link (B) is output to by the combining end of described the second optical branching device (5)；Described the second optical branching device (5) believes the backward light of the carrying timing signal inputted from the combining end of the second optical branching device Number it is divided into two-way：Described the second photoelectric conversion module (6.5) of backward signal warp, described the second identification module (6.4) all the way Into described time-sequence control module (6.3), the output end of the time-sequence control module (6.3) is to the first described magneto-optic shutter (2) and the second magneto-optic shutter (4) sends control instruction, control the first magneto-optic shutter (2) and the second magneto-optic shutter (4) optical signal Transmission direction is the second state (II) from right-to-left；Simultaneously after another way to optical signal from right-to-left successively by described the Two magneto-optic shutters (4), the single fiber bi-directional image intensifer (3), the first magneto-optic shutter (2) and the first light without isolator point Road device (1), left end fiber link (A) is output to by the combining end of the first optical branching device (1).
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| CN106357336B (en) | 2016-08-31 | 2018-12-25 | 上海交通大学 | High-precision long-distance distributed optical fiber time delivering method and system |
| CN107231196B (en) * | 2017-07-03 | 2023-12-22 | 宁波超速达通讯科技有限公司 | Single-ended bidirectional optical fiber transmission channel |
| CN109327257A (en) * | 2018-10-22 | 2019-02-12 | 上海交通大学 | Optics Instantaneous Frequency Measurement device |
| CN111711055B (en) * | 2020-06-11 | 2021-09-10 | 武汉光迅科技股份有限公司 | Bidirectional Raman erbium-doped fiber hybrid amplifier, optical signal amplification method and system |
| CN112688736B (en) * | 2020-12-10 | 2021-12-21 | 中国计量科学研究院 | Self-adaptive time-sharing transmission bidirectional symmetrical light amplification device |
| CN114499667B (en) * | 2022-01-28 | 2023-06-13 | 上海交通大学 | Device and method for optimizing gain of bidirectional optical amplifier in single-fiber bidirectional optical fiber link |
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