CN105790845A - Single-fiber bidirectional time-division multiplexing light amplification apparatus - Google Patents
Single-fiber bidirectional time-division multiplexing light amplification apparatus Download PDFInfo
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- CN105790845A CN105790845A CN201610216342.6A CN201610216342A CN105790845A CN 105790845 A CN105790845 A CN 105790845A CN 201610216342 A CN201610216342 A CN 201610216342A CN 105790845 A CN105790845 A CN 105790845A
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- optical
- magneto
- branching device
- time
- optic shutter
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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
Abstract
The invention relates to a single-fiber bidirectional time-division multiplexing light amplification apparatus in a fiber time frequency transmission field. The single-fiber bidirectional time-division multiplexing light amplification apparatus comprises a first optical splitter, a first magneto-optical switch, a single-fiber bidirectional optical amplifier without an isolator, a second magneto-optical switch, a second optical splitter and a control unit. On the basis of a relationship between a light passing direction of a magneto-optical switch and a control voltage, light passing directions of the magneto-optical switches are controlled according to a detected optical signal transmission direction and thus optical signals in forward transmission and backward transmission on a time transfer channel enter the single-fiber bidirectional optical amplifier at different time, so that same-fiber same-wave bidirectional amplification of optical signals with timing signals in a BTDM-SFSW time transfer link is realized and the link symmetry is guaranteed to the greatest extent. With unidirectional light passing characteristic of the magneto-optical switch, the influence on a fiber time transfer performance by multiple times of amplification of the noise like rayleigh scattering can be avoided effectively.
Description
Technical field
The present invention relates to optical amplification device, specifically a kind of single fiber bi-directional time division multiplex optical amplification device.
Background technology
High-precision Time Transmission technology is surveyed in satellite navigation, Aero-Space, survey of deep space, geological mapping, fundamental physical quantity
There is important using value in the fields such as amount.Be currently based on the Time Transmission technology of satellite, as GPS precise point positioning method (PPP),
Two-way satellite Time Transmission (TWSTFT), can reach the Time Transmission precision of ns magnitude.Along with more high stables such as light clocks
Degree and the invention of uncertainty Zhong Yuan and put into operation, these Transfer Technologies can not meet scientific research and social development
Demand.A kind of theoretical uncertainty can be better than the space-based Time Transmission technology based on satellite laser ranging (SLR) principle of 100ps
(T2L2) the most also in development.Although above-mentioned space-based Time Transmission technology is the most ripe or feasibility obtains
Checking, but their own also exists the shortcomings such as system complexity, cost intensive, length performance period, poor stability, poor reliability.
Fiber-optic transfer has low-loss, big bandwidth, safe and reliable advantage, has been obtained for being widely applied in the communications field.Profit
With existing widely distributed Networks of Fiber Communications, carrying out Time Transmission based on optical fiber is to realize having of split-second precision transmission
Effect approach.
High-precision optical fiber Time Transmission is faced with optical fiber link propagation delay time to be changed with factor changes such as temperature, stress and transmission wavelengths
Problem.In order to realize high-precision Time Transmission, current commonly used with fine transmitted in both directions scheme.With existing fiber communication network
The single fiber one-way transmission of middle employing is different with amplifying technique, for the loss of compensated optical signal in long-distance optical fiber Time Transmission,
Must carry out single fiber bi-directional light amplification, single fiber bi-directional amplifies becomes the pass realizing high accuracy two-way time transfer in Networks of Fiber Communications
One of key technology.AGH Polytechnics of Poland 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.], by the isolator at unidirectional EDFA two ends is changed work
Wave filter realizes single fiber bi-directional and amplifies, it is ensured that the bilateral symmetry of optical fiber time relays link propagation delay time, but Rayleigh scattering etc. are made an uproar
Repeatedly light amplification that sound is caused by amplifier transmitted in both directions can severe exacerbation signal to noise ratio, limit total optical 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 metering 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]
Propose a kind of bi-directional light magnification scheme towards wavelength-division multiplex (WDM) optical fiber time transmission scheme.Utilize WDM by two
The wavelength in direction separately, inserts an isolator respectively, then closes the method for ripple to suppress the repeatedly amplification of the noises such as Rayleigh scattering.Should
The raising of scheme signal to noise ratio is asymmetric as cost with transmitted in both directions time delay, needs amplifying the most right of transmitted in both directions time delay on link
Title property is demarcated, and can increase the enforcement of optical fiber time transmission system and operation cost greatly, and the overall uncertainty demarcated along with
The increase of amplifier number and the prolongation of transmission range increase；Czech CESNET [4, V.S.a.J.Vojt ě ch, " Time and
Frequency Transfer Using Amplified Optical Links, " in EFTF 2014,2014, pp.325-328.] etc. use distribution
The raman amplifier of formula carries out light amplification to the time signal of transmitted in both directions, although single fiber can ensure that the two-way right of chain circuit transmission time delay
Title property, but the noises such as Rayleigh scattering also can obtain repeatedly light amplification, there is also pump power height simultaneously, efficiency is low and relies on input light
The problems such as the polarization direction of signal.
Summary of the invention
Present invention aims to above-mentioned the deficiencies in the prior art, it is provided that a kind of single fiber bi-directional optical amplification device.This device
Can realize transmitting with the two-way time-multiplexed optical fiber time of ripple with fine, this device has high symmetrical, the feature of low noise.This
Bright by utilizing the optical direction of magneto-optic shutter and controlling the relation of voltage, according to the optical signal transmission direction controlling magnetic detected
The optical direction of photoswitch, makes the optical signal timesharing of forward direction and reverse transfers on Time Transmission passage enter the list not having isolator
Fine bidirectional optical amplifier, it is achieved with fine with carrying timing in ripple two-way time division multiplex (BTDM-SFSW) Time Transmission link
The same fibre of the optical signal of signal is with ripple Bi-directional amplifier.
The technical solution of the present invention is as follows:
A kind of single fiber bi-directional time division multiplex optical amplification device, its feature is that composition includes: the first optical branching device, the first magneto-optic shutter,
There is no the single fiber bi-directional image intensifer of isolator, the second magneto-optic shutter, the second optical branching device and control unit；Described control
Unit is from left to right by the first photoelectric conversion module, the first identification module, time-sequence control mode, the second identification module and second
Photoelectric conversion module forms；
The conjunction terminal of the first described optical branching device is connected with left end optical fiber link, light splitting end of the first optical branching device through with
One optical port of the first described magneto-optic shutter is connected, another light splitting end of the first optical branching device and the first described photoelectricity
The light input end mouth of modular converter is connected, and the output port of this first photoelectric conversion module is through the first described identification module and institute
One input port of the time-sequence control mode stated is connected；
The conjunction terminal of the second described optical branching device is connected with right-hand member optical fiber link, a light splitting end of this second optical branching device with
One optical port of the second described magneto-optic shutter is connected, another light splitting end of the second optical branching device and the second described photoelectricity
The input of modular converter is connected, the outfan of this second photoelectric conversion module through the second described identification module with time described
Another input port of sequence control module is connected；
The outfan of described time-sequence control mode is connected with the control end of the first described magneto-optic shutter and the second magneto-optic shutter；
One port of the described single fiber bi-directional image intensifer not having isolator and another optical port phase of the first described magneto-optic shutter
Even, another port of described single fiber bi-directional image intensifer is connected with another optical port of the second described magneto-optic shutter.
The forward light signal carrying timing signal inputted from the conjunction terminal of the first optical branching device is divided by the first described optical branching device
For two-way: a road forward signal is successively through the sequential control described in the first described photoelectric conversion module, the first identification module entrance
Molding block, this time-sequence control mode output control instruction, the first magneto-optic shutter and the second magneto-optic shutter described in control are from left
To the first right state, another road forward signal sequentially passes through described the first magneto-optic shutter, not isolation from left to right simultaneously
The single fiber bi-directional image intensifer of device, the second magneto-optic shutter and the second optical branching device, by the conjunction terminal of the second described optical branching device
Output is to right-hand member optical fiber link；
The backward optical signal carrying timing signal inputted from the conjunction terminal of the second optical branching device is divided by the second described optical branching device
For two-way: a road backward signal is through the sequential described in the second described photoelectric conversion module, the second described identification module entrance
Control module, the outfan of this time-sequence control mode sends control instruction to the first described magneto-optic shutter and the second magneto-optic shutter,
The transmission direction controlling the first magneto-optic shutter and the second magneto-optic shutter optical signal is the second state from right-to-left；Another road simultaneously
Backward optical signal sequentially passes through the second described magneto-optic shutter, the described single fiber bi-directional light amplification not having isolator from right-to-left
Device, the first magneto-optic shutter and the first optical branching device, exported left end optical fiber link by the conjunction terminal of the first optical branching device.
The technique effect of the present invention is as follows:
The present invention based on ripe optical device, utilize the optical direction of magneto-optic shutter by controlling the characteristic that voltage determines,
Do not have in the single fiber bi-directional image intensifer of isolator to achieve to the fine time signal with ripple transmission carry out two-way time sharing transmissions and
Unidirectional light amplifies.
Single fiber of the present invention ensure that optical fiber time relays link propagation delay time bilateral symmetry with ripple transmission, magneto-optic shutter unidirectional
Transporting restrained effectively the repeatedly amplification of the noises such as Rayleigh scattering, improves signal to noise ratio.
The present invention can realize transmitting with the two-way time-multiplexed fiber-optic signal of ripple with fine, and this device has high symmetrical, low noise
Feature.
Accompanying drawing explanation
Fig. 1 is the structural representation of single fiber bi-directional time division multiplex optical amplification device of the present invention；
Fig. 2 is single fiber bi-directional time division multiplex optical amplification device Bi-directional amplifier process schematic of the present invention, and wherein, a is forward light
Signal amplification process, b is backward optical signal amplification process.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.Embodiment gives the detailed embodiment of the present invention
With concrete workflow, but protection scope of the present invention is not limited to following embodiment.
First refer to the structural representation that Fig. 1, Fig. 1 are single fiber bi-directional time division multiplex optical amplification devices of the present invention, as seen from the figure, originally
Invention single fiber bi-directional time division multiplex optical amplification device, composition includes: first optical branching device the 1, first magneto-optic shutter 2, not every
Single fiber bi-directional image intensifer the 3, second magneto-optic shutter the 4, second optical branching device 5 and control unit 6 from device；Described control
Unit 6 is identified by first photoelectric conversion module the 6.1, first identification module 6.2, time-sequence control mode 6.3, second from left to right
Module 6.4 and the second photoelectric conversion module 6.5 form；
The conjunction terminal of the first described optical branching device 1 is connected with left end optical fiber link A, a light splitting of the first optical branching device 1
End is through being connected with an optical port of the first described magneto-optic shutter 2, and another light splitting end of the first optical branching device 1 is with described
The first photoelectric conversion module 6.1 light input end mouth be connected, the output port of this first photoelectric conversion module 6.1 is through described
First identification module 6.2 is connected with an input port of described time-sequence control mode 6.3；
The conjunction terminal of the second described optical branching device 5 is connected with right-hand member optical fiber link B, point of this second optical branching device 5
Light end is connected with an optical port of the second described magneto-optic shutter 4, and another light splitting end of the second optical branching device 5 is with described
The input of the second photoelectric conversion module 6.5 be connected, the outfan of this second photoelectric conversion module 6.5 is through described second knowledge
Other module 6.4 is connected with described another input port of time-sequence control mode 6.3；
The outfan of described time-sequence control mode 6.3 and the first described magneto-optic shutter 2 and control of the second magneto-optic shutter 4
End processed is connected；One port of the described single fiber bi-directional image intensifer 3 not having isolator and the first described magneto-optic shutter 2
Another optical port be connected, another port and described second of the described single fiber bi-directional image intensifer 3 not having isolator
Another optical port of magneto-optic shutter 4 is connected.
In embodiment, in two-way time transfer wavelength channel, the timing signal of transmission is 1PPS, carries the optical signal I of 1PPS
Transmission direction be A to B, such as Fig. 2 a, i.e. forward direction, the transmission direction of the optical signal II carrying 1PPS is B to A, as
Fig. 2 b, the most backward.Optical signal I and optical signal II Staggered transmitting in a link.In embodiment, photoswitch uses switching time
For 1 × 1 magneto-optic shutter of musec order, when it is state I, link transmission direction is and only forward direction, when it is state II
Link transmission direction is and the most backward；Image intensifer uses two ports erbium-doped fiber amplifier without isolator
(EDFA)。
From the light amplification process such as Fig. 2 (a) in A to B direction Suo Shi.Light that transmit to B from A, that carry 1PPS is believed
The optical signal of 10% is inputted control unit 6 through first optical branching device 1 of a 1:9 by number I, remaining 90% input first magnetic
Photoswitch 2.Control unit 6 is according to receiving the moment t of fixed timing mark (1PPS) in forward light signal I1, determine next
The secondary moment t that first magneto-optic shutter 2 and the second magneto-optic shutter 4 are set to state I11<t1+T-ts, wherein T is quilt
The cycle of the timing signal of transmission, tsSwitching time for magneto-optic shutter.In arrival, moment t is set11Time, control unit 6 will
First magneto-optic shutter 2 and the second magneto-optic shutter 4 arrange and are maintained at state I so that carry the optical signal I of 1PPS next time
Sequentially pass through the first magneto-optic shutter 2, single fiber bi-directional image intensifer the 3, second magneto-optic shutter 4 without isolator and the second light to divide
Road device 5, is exported optical fiber link by the conjunction terminal of this second optical branching device 5；
From the light amplification process such as Fig. 2 (b) in B to A direction Suo Shi.The optical signal carrying 1PPS transmitted to A from B
The optical signal of 10% is inputted control unit 6 through second optical branching device 5 of a 1:9 by II, remaining 90% input second magnetic
Photoswitch 4.Control unit 6 is according to detecting the moment t of fixed timing mark (1PPS) in backward optical signal II2, determine next
The secondary moment t that first magneto-optic shutter 2 and the second magneto-optic shutter 4 are set to state I I21<t2+T-ts.Arrange arriving
Moment t21Time, the first magneto-optic shutter 2 and the second magneto-optic shutter 4 are arranged and are maintained at state I I by control unit 6 so that under
The optical signal II once carrying 1PPS sequentially passes through the second magneto-optic shutter 4, single fiber bi-directional image intensifer 3 without isolator,
First magneto-optic shutter 2 and the first optical branching device 1, is exported optical fiber link by the conjunction terminal of this first optical branching device 1.
From the light amplification process such as Fig. 2 (a) in A to B direction Suo Shi.Light that transmit to B from A, that carry 1PPS is believed
The optical signal of 10% is inputted control unit 6 through first optical branching device 1 of a 1:9 by number I, remaining 90% input first magnetic
Photoswitch 2.The control unit 6 targeting signal (targeting signal and timing code start mark in detecting forward light signal I
Between time difference > switching time of the number × magneto-optic shutter of amplifier in link) time, immediately by the first magneto-optic shutter 2 and
Two magneto-optic shutters 4 arrange and are maintained at state I so that remaining optical signal I of 90% sequentially passes through the first magneto-optic shutter 2, no
Single fiber bi-directional image intensifer the 3, second magneto-optic shutter 4 containing isolator and the second optical branching device 5, by this second optical branching device 5
Conjunction terminal export optical fiber link B；
From the light amplification process such as Fig. 2 (b) in B to A direction Suo Shi.The optical signal carrying 1PPS transmitted to A from B
(II) optical signal of 10% is inputted control unit 6 by the second optical branching device 5 through a 1:9, remaining 90% input the
Two magneto-optic shutters 4.Control unit 6 after detecting the targeting signal in optical signal II (targeting signal and timing code initiate
Time difference between labelling > switching time of the number × magneto-optic shutter of amplifier in link) time, by the first magneto-optic shutter 2 and
Two magneto-optic shutters 4 arrange and are maintained at state I I so that remaining optical signal II of 90% sequentially passes through the second magneto-optic shutter 4,
Single fiber bi-directional image intensifer the 3, first magneto-optic shutter 2 without isolator and the first optical branching device 1, by this first optical branching device
The conjunction terminal of 1 exports optical fiber link A.
Claims (2)
1. a single fiber bi-directional time division multiplex optical amplification device, is characterised by that its composition includes: the first optical branching device (1), first
Magneto-optic shutter (2), there is no the single fiber bi-directional image intensifer (3) of isolator, the second magneto-optic shutter (4), the second optical branching device
And control unit (6) (5)；Described control unit (6) from left to right by the first photoelectric conversion module (6.1), first
Identification module (6.2), time-sequence control mode (6.3), the second identification module (6.4) and the second photoelectric conversion module (6.5)
Composition；
The conjunction terminal of described the first optical branching device (1) is connected with left end optical fiber link (A), the first optical branching device (1)
One light splitting end through being connected with an optical port of described the first magneto-optic shutter (2), another of the first optical branching device (1)
Individual light splitting end is connected with the light input end mouth of described the first photoelectric conversion module (6.1), this first photoelectric conversion module (6.1)
Output port through an input of described the first identification module (6.2) with described time-sequence control mode (6.3)
Mouth is connected；
The conjunction terminal of described the second optical branching device (5) is connected with right-hand member optical fiber link (B), this second optical branching device (5)
A light splitting end be connected with an optical port of described the second magneto-optic shutter (4), another of the second optical branching device (5)
Individual light splitting end is connected with the input of described the second photoelectric conversion module (6.5), this second photoelectric conversion module (6.5)
Outfan is connected with described time-sequence control mode (6.3) another input port through described the second identification module (6.4)；
The outfan of described time-sequence control mode (6.3) and described the first magneto-optic shutter (2) and the second magneto-optic shutter
(4) control end is connected；One port of the described single fiber bi-directional image intensifer (3) not having isolator and described the
Another optical port of one magneto-optic shutter (2) is connected, another of the described single fiber bi-directional image intensifer (3) not having isolator
Individual port is connected with another optical port of described the second magneto-optic shutter (4).
Single fiber bi-directional time division multiplex optical amplifier arrangement the most according to claim 1, it is characterised in that: described first
The forward light signal carrying timing signal inputted from the conjunction terminal of the first optical branching device (1) is divided into two by optical branching device (1)
Road: a road forward signal enters described through described the first photoelectric conversion module (6.1), the first identification module (6.2) successively
Time-sequence control mode (6.3), this time-sequence control mode (6.3) output control instruction, the first magneto-optic shutter described in control
(2) and the second magneto-optic shutter (4) is the first state (I) from left to right, and another road forward light signal is from left to right simultaneously
Sequentially pass through described the first magneto-optic shutter (2), there is no the single fiber bi-directional image intensifer (3) of isolator, the second magneto-optic shutter
(4) and the second optical branching device (5), is exported right-hand member optical fiber link (B) by the conjunction terminal of described the second optical branching device (5)；
The backward light letter carrying timing signal that described the second optical branching device (5) will input from the conjunction terminal of the second optical branching device
Number it is divided into two-way: a road backward signal is through described the second photoelectric conversion module (6.5), described the second identification module (6.4)
Time-sequence control mode (6.3) described in entrance, the outfan of this time-sequence control mode (6.3) is to the first described magneto-optic shutter
(2) and the second magneto-optic shutter (4) sends control instruction, controls the first magneto-optic shutter (2) and the second magneto-optic shutter (4)
The transmission direction of optical signal is the second state (II) from right-to-left；Sequentially pass through from right-to-left to optical signal behind another road simultaneously
Described the second magneto-optic shutter (4), described there is no the single fiber bi-directional image intensifer (3) of isolator, the first magneto-optic shutter (2)
With the first optical branching device (1), the conjunction terminal of the first optical branching device (1) export left end optical fiber link (A).
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| CN107231196A (en) * | 2017-07-03 | 2017-10-03 | 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 |
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| CN111711055A (en) * | 2020-06-11 | 2020-09-25 | 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 |
| CN112688736A (en) * | 2020-12-10 | 2021-04-20 | 中国计量科学研究院 | Self-adaptive time-sharing transmission bidirectional symmetrical light amplification device |
| CN114499667A (en) * | 2022-01-28 | 2022-05-13 | 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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| EP3484069A4 (en) * | 2016-08-31 | 2019-07-31 | Shanghai Jiao Tong University | High precision and long distance distributed optical fiber time transmission method and system |
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| CN111711055A (en) * | 2020-06-11 | 2020-09-25 | 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 |
| CN112688736A (en) * | 2020-12-10 | 2021-04-20 | 中国计量科学研究院 | Self-adaptive time-sharing transmission bidirectional symmetrical light amplification device |
| 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 |
| CN114499667A (en) * | 2022-01-28 | 2022-05-13 | 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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| CN105790845B (en) | 2017-12-26 |
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