CN106100744B - The compensation method of loop tunable dispersion and device - Google Patents
The compensation method of loop tunable dispersion and device Download PDFInfo
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- CN106100744B CN106100744B CN201610608539.4A CN201610608539A CN106100744B CN 106100744 B CN106100744 B CN 106100744B CN 201610608539 A CN201610608539 A CN 201610608539A CN 106100744 B CN106100744 B CN 106100744B
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- loop
- dcf
- dispersion compensation
- photoswitch
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Optical Communication System (AREA)
Abstract
A kind of loop tunable dispersion compensation method and device, the input of the optical signals DCF loops formed is inputted in loop and circulated wherein, the output end output of optical signals loop after dispersion compensation several times, the present invention is using DCF loops come equivalent DCF long links, reduce DCF usage amount, larger compensation rate is produced, while the tunable of chromatic dispersion compensation quantity can be realized by changing the control signal of photoswitch, can be realized with existing fiber network seamless compatible.
Description
Technical field
The present invention relates to a kind of technology of fiber optic communication field, specifically a kind of loop tunable dispersion compensation method and
Device.
Background technology
In fiber optic communication, the influence of dispersion and nonlinear effect to signal is more and more prominent.Transmission rate is higher, dispersion
Influence bigger.Dispersion compensating fiber (Dispersion Compensation Fiber, DCF) is used as a kind of Passive Dispersion Compensator
Element, 1st order chromatic dispersion and 2nd order chromatic dispersion can be compensated simultaneously.However, due to DCF design features itself, fibre loss is larger,
Volume is big, and can not change its caused negative dispersion amount.
The content of the invention
The present invention can only realize that 2 times of dispersion compensation ability improves for prior art, and be fixed dispersion compensation
The defects of ability, a kind of loop tunable dispersion compensation method and device are proposed, can not only be mended dispersion by multiple circulation
The ability of repaying improves more times, additionally it is possible to cycle-index is controlled by switching, so as to neatly compensate the color of different linkage lengths
Dissipate.
The present invention is achieved by the following technical solutions：
It is the present invention relates to a kind of loop tunable dispersion compensation method, the input of the optical signals DCF loops formed is defeated
Enter in loop and circulate wherein, the output end output of the optical signals loop after dispersion compensation several times.
The circulation number of turns of optical signal in described loopWherein：DchFor standard single-mode fiber
Abbe number, LSMFFor optical signal transmission length, DDCFFor the abbe number of loop, LDCFFor the DCF length of loop.
The photoswitch as output end and input is provided with described loop.
The present invention relates to a kind of loop tunable dispersion compensation device for realizing the above method, including：DCF and conduct input
End, the photoswitch of output end, wherein：DCF both ends are connected to form loop with photoswitch respectively.
The Erbium Doped Fiber Amplifiers EDFAs (EDFA) for optical signal amplification is provided with described loop.
The control signal that described photoswitch is connected with square-wave generator and sent by it controls.
The cycle for the square wave that described square-wave generator is sent is the integral multiple of DCF length mapping times, wherein：Length is reflected
Penetrate the timeL is DCF length, and n is refractive index, and c is the light velocity.
Described square-wave generator is microcomputer development plate or waveform generator (WG).
Described photoswitch is 2 × 2 photoswitches.
2 × 2 described photoswitches are connected with Two-port netwerk photoswitch.
Technique effect
Compared with prior art, the present invention reduces DCF usage amount using DCF loops come equivalent DCF long links, produces
Raw larger compensation rate, while the adjustable of chromatic dispersion compensation quantity can be realized by changing the control signal of photoswitch, it is and existing
Fiber optic network can realize seamless compatibility.
Brief description of the drawings
Fig. 1 is loop tunable dispersion compensation device structural representation；
Fig. 2 is experimental system structure chart；
Fig. 3 is that 10Gbits/s signals pass through waveform comparative result figure before and after loop dispersion compensation.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
As shown in figure 1, the loop tunable dispersion compensation device of the present embodiment includes：DCF and as input, output end
Photoswitch, wherein：DCF both ends are connected to form loop with photoswitch respectively, and photoswitch is 2 × 2 photoswitches.2 × 2 photoswitch by
The electric signal control that outside square-wave generator is sent.
Loop tunable dispersion compensation method in the present embodiment includes DCF is formed into loop first, then optical signals ring
Circulate in the input input loop of road and wherein, finally, the output of the optical signals loop after dispersion compensation several times
End output.
Described square-wave generator is microcomputer development plate, such as：Field programmable gate array (FPGA), or using any
Waveform generator.Optical signal in the output end of loop, loop can be presented with straight-through optical signal replaces output, so 2 × 2
Photoswitch (OFS) front end or rear end set a Two-port netwerk photoswitch for being used for suppressing through connect signal.
2 × 2 described photoswitches have four ports, and port numbering is respectively 1,2,3 and 4.DCF respectively with the phase of port 2 and 4
Even.When the control signal that WG is sent is in high level, 2 × 2 photoswitches are in crossing condition, i.e. port is in 1-4,2-3 and is connected
State, external optical signal input, interior lights signal output.When the control signal that WG is sent is in low level, at 2 × 2 photoswitches
In pass-through state, i.e. port is in 1-3,2-4 attached state, and loop is closed, and the optical signal in loop circulates in the loop.
Dispersion compensation caused by the single cycle of described loop is negative dispersion, can pass through length mapping timeTo determine the optical signal length that can be carried in loop, L is DCF length, and n is refractive index.Length mapping time t is
Circulate the time of a circle in the loop for optical signal.Therefore, t have to be larger than the response time of 2 × 2 photoswitches, to ensure to export
Complete signal can be obtained, is also greater than the half of the manifolding time of 2 × 2 photoswitches, to ensure that 2 × 2 photoswitches can have
The control loop state of effect.
Described square-wave generator is by changing the cycle of square wave and accounting for work(than changing the recurrent state of loop.Utilize length
Degree mapping time carrys out control loop state.The cycle of square wave must be the integral multiple of DCF length mapping times, and multiple is equal to ring
Circulate the number of turns in road.High level control enters the optical signal length of loop, the of length no more than DCF length of optical signal.Looped cycle time
Number has following relation with optical signal transmission distance, fiber lengths：Circulate the number of turnsWherein：DchFor mark
The chromatic dispersion coefficient of quasi-monomode fiber, LSMFFor optical signal transmission length, DDCFFor the abbe number of loop, LDCFFor loop
DCF length.
As shown in Fig. 2 in dispersion compensation experiment, transmission rate 10Gbits/s, including：60km single-mode fiber, 5km
DCF, 2 × 2 photoswitches and wave generator of nanosecond.Laser in figure is laser, and PC is Polarization Controller；DC
Bias is current source, and MZM is modulator, and SMF is single-mode fiber, and FS is fiber switch, and PD is detector, and OSC is oscillograph,
Attenuator is attenuator, and PPG is pattern generator.
Described single-mode fiber is formed by the 25km of volume two and the cascade of a roll of 10km optical fiber, loss about 0.2dB/km, dispersion
Coefficient is about 16ps/ (nskm).DCF loss is 0.55dB/km, and abbe number is -107ps/ (nskm), in theory can
Enough compensate 33.5km single-mode fiber.
The driving power of 2 × 2 described photoswitches is 12V, and the high level as the electric signal of control signal is no more than 5V,
Low level is 0V, and driving manifolding speed is 100kHz, and the response time is no more than 300ns, and insertion loss is up to 1.3dB.WG is sent out
The square wave amplitude 3V gone out, cycle 50us, work(ratio is accounted for as 50%.
As shown in figure 3, optical signal and through connect signal in gain loop by adjusting the EDFA in experimental circuit
In oscillograph separate, so as to distinguish by loop obtain dispersion compensation optical signal i.e. Fig. 3 middle and upper parts eye pattern with not
The through connect signal for obtaining dispersion compensation is Fig. 3 middle and lower parts eye pattern, and contrast discovery circulation loop is used so that the dispersion of signal obtains
To compensation.
Compared with prior art, the present invention reduces DCF usage amount using DCF loops come equivalent DCF long links, produces
Raw larger compensation rate, while the tunable of chromatic dispersion compensation quantity can be realized by changing the control signal of photoswitch, it is and existing
Fiber optic network can realize seamless compatibility.During as receiving terminal, after loop compensation, residual dispersion is controlled in certain limit
It is interior.When doing transmitting terminal, negative dispersion can be produced, so as to for pre-compensating for.
Claims (6)
1. a kind of loop tunable dispersion compensation method, it is characterised in that the loop input for forming optical signals DCF inputs ring
Circulate in road and wherein, the output end output of the optical signals loop after dispersion compensation several times；
The circulation number of turns of optical signal in the loop of described DCF compositionsWherein：DchFor standard list
The abbe number of mode fiber, LSMFFor optical signal transmission length, DDCFFor the abbe number of loop, LDCFFor the DCF length of loop；
The photoswitch as output end and input is provided with described loop, photoswitch is connected with square-wave generator and the control sent by it
Signal control processed；The cycle for the square wave that the square-wave generator is sent is the integral multiple of DCF length mapping times, wherein：Length is reflected
Penetrate the timeL is DCF length, and n is refractive index.
A kind of 2. loop tunable dispersion compensation device, it is characterised in that including：DCF and light as input, output end are opened
Close, wherein：DCF both ends are connected to form loop with photoswitch respectively；
The control signal that described photoswitch is connected with square-wave generator and sent by it controls；
The cycle for the square wave that described square-wave generator is sent is the integral multiple of DCF length mapping times, wherein：When length maps
BetweenL is DCF length, and n is refractive index.
3. loop tunable dispersion compensation device according to claim 2, it is characterized in that, it is provided with described loop and is used for light
The Erbium Doped Fiber Amplifiers EDFAs of signal amplification.
4. loop tunable dispersion compensation device according to claim 2, it is characterized in that, described square-wave generator is monolithic
Machine development board or waveform generator.
5. loop tunable dispersion compensation device according to claim 2, it is characterized in that, described photoswitch is that 2 × 2 light are opened
Close.
6. loop tunable dispersion compensation device according to claim 5, it is characterized in that, 2 × 2 described photoswitches are connected with two
Port photoswitch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610608539.4A CN106100744B (en) | 2016-07-29 | 2016-07-29 | The compensation method of loop tunable dispersion and device |
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| CN201610608539.4A CN106100744B (en) | 2016-07-29 | 2016-07-29 | The compensation method of loop tunable dispersion and device |
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| CN106100744B true CN106100744B (en) | 2018-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109818237B (en) * | 2019-03-28 | 2021-01-01 | 上海交通大学 | Ultrashort laser pulse shaping system based on optical fiber ring circulation modulation time grating |
| CN113804412B (en) * | 2021-07-20 | 2024-05-31 | 广东工业大学 | Micro-chromatic dispersion measuring device of optical fiber device based on annular light path structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168579A (en) * | 1996-04-02 | 1997-12-24 | 康宁股份有限公司 | Switchable fiber optic device for fiber transmission system and components thereof |
| CN1390003A (en) * | 2001-05-16 | 2003-01-08 | 古河电气工业株式会社 | Variable light-dispersing compensation model |
| CN1412967A (en) * | 2001-10-17 | 2003-04-23 | 华为技术有限公司 | Two-way optical fiber dispersion compensation device |
| CN205986880U (en) * | 2016-07-29 | 2017-02-22 | 上海南明光纤技术有限公司 | Harmonious chromatic dispersion compensation arrangement of loop |
-
2016
- 2016-07-29 CN CN201610608539.4A patent/CN106100744B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168579A (en) * | 1996-04-02 | 1997-12-24 | 康宁股份有限公司 | Switchable fiber optic device for fiber transmission system and components thereof |
| CN1390003A (en) * | 2001-05-16 | 2003-01-08 | 古河电气工业株式会社 | Variable light-dispersing compensation model |
| CN1412967A (en) * | 2001-10-17 | 2003-04-23 | 华为技术有限公司 | Two-way optical fiber dispersion compensation device |
| CN205986880U (en) * | 2016-07-29 | 2017-02-22 | 上海南明光纤技术有限公司 | Harmonious chromatic dispersion compensation arrangement of loop |
Non-Patent Citations (1)
| Title |
|---|
| 20Gbit/s-based soliton WDM transmission over transoceanic distance using periodic compensation of dispersion and its slope;M.Suzuki等;《ELECTRONICS LETTERS》;19970410;第33卷(第8期);第691-692页 * |
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Effective date of registration: 20191111 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee after: Ma Lin Address before: 4, No. 555, Lane 3111, 201401 West Ring Road, Shanghai, Fengxian District, -590 Patentee before: SHANGHAI NET MILES TECHNOLOGY CO.,LTD. Effective date of registration: 20191111 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Co-patentee after: Du Jiangbing Patentee after: Ma Lin Co-patentee after: Zhang Wenjia Co-patentee after: Bai Linbin Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Ma Lin |
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