CN202160181U - No-repeater optical fiber transmission system - Google Patents
No-repeater optical fiber transmission system Download PDFInfo
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- CN202160181U CN202160181U CN201120283506XU CN201120283506U CN202160181U CN 202160181 U CN202160181 U CN 202160181U CN 201120283506X U CN201120283506X U CN 201120283506XU CN 201120283506 U CN201120283506 U CN 201120283506U CN 202160181 U CN202160181 U CN 202160181U
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Abstract
The utility model discloses a no-repeater optical fiber transmission system which comprises an optical transmitter, an optical power amplifier, an optical pulse extender, an optical filter, a high-power optical fiber amplifier, a dispersion compensation module, an optical pulse compressor, a remote optically pumped preamplifier, a distributed optical fiber Raman amplifier, an optical preamplifier, a nonlinear optical loop mirror and an optical receiver which are sequentially connected by a transmission optical fiber. A remote pumping source is connected to the remote optically pumped preamplifier, and the distributed optical fiber Raman amplifier mainly comprises a Raman pumping source, a wavelength division multiplexer and an optical signal transmission optical fiber behind the remote optically pumped preamplifier. Time-domain extension is carried out on picosecond optical pulses by a linear chirped fiber bragg grating, the pulses are transmitted in the optical fibers after amplified by high power, and the pulses processed by the time-domain extension are compressed and recovered to the picosecond pulses by a linear chirped fiber bragg grating which is oppositely arranged at a proper distance so as to obtain time extension gain. The transmission distance of the no-repeater optical fiber transmission system is extended.
Description
Technical field
The utility model relates to the Optical Fiber Transmission field, is specifically related to a kind of non-relay fiber optic transmission system.
Background technology
At present; The solution of domestic and international non-relay fiber optic transmission system is for locating to adopt pump EDFA power amplifier far away in distance near the tens of kilometers of transmitter one side (50-70km); Locate to adopt pump EDFA light preamplifier far away in distance near receiver one side hundred kilometers (110-140km), and adopt distributed optical fiber Raman amplifier in receiver one side.Need could arrive pump EDFA power amplifier far away through tens of kilometers (50-70km) transmission owing to be positioned at the pump light of transmitter terminal 1480nm wavelength; And in long Distance Transmission process; Optical fiber can receive the influence of stimulated Raman scattering effect, and most of energy of its pump light will be transferred on the Raman frequency shift wavelength.Therefore, the solution of present non-relay fiber optic transmission system, its useful 1480nm wavelength pumping light power is very low, makes near the power output of the pump EDFA power amplifier far away of transmitting terminal limited; And it is limited near the input sensitivity of the pump EDFA light preamplifier far away of receiving terminal; Thereby cause the limited transmission distance between pump EDFA power amplifier far away and the pump EDFA light preamplifier far away, the transmission range of whole non-relay fiber optic transmission system is also limited thereupon.
The utility model content
In order to solve the limited transmission distance problem of present non-relay fiber optic transmission system, the utility model proposes a kind of non-relay fiber optic transmission system.Gain method when the utility model provides a kind of expansion of novel concept; And adopt the local high power light power amplifier at transmitter place to replace pump light power amplifier far away; Adopt the time domain compress technique of carrying out high power amplification and low-power expansion pulse after the expansion of psec optical pulse time domain; Gain when expanding with acquisition can improve the transmission range that has non-relay fiber optic transmission system now greatly.
The utility model solves the technical scheme that its technical problem adopted:
A kind of non-relay fiber optic transmission system comprises the optical sender, power amplifier, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier and the optical receiver that are connected successively by Transmission Fibers; Be connected with pump pumping source far away on the pump light preamplifier wherein far away, distributed optical fiber Raman amplifier then mainly is made up of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away; Its difference is also further to comprise: the light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module and the optical pulse compressor that are connected successively by Transmission Fibers;
Wherein light pulse expander and optical pulse compressor constitute by a linear chirp optical fiber grating and an optical circulator; Linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form the input and the output of light pulse expander or optical pulse compressor respectively; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding annular device, its placement in the opposite direction;
Power amplifier is connected with the light pulse expander; Optical pulse compressor links to each other with pump light preamplifier far away; Be provided with a long distance optical fiber between high-power fiber amplifier and the dispersion compensation module, be provided with another long distance optical fiber between pump light preamplifier far away and the distributed optical fiber Raman amplifier.
In the such scheme, said high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
In the such scheme, said optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier; The input of radio frequency amplifier links to each other with user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.
In order to eliminate the light Kerr nonlinearity effect that occurs in the transmission line, also be serially connected with nonlinear optical loop mirror between said light preamplifier of such scheme and the optical receiver.
Compared with prior art, the utility model carries out external modulation loading user profile to the wide range psec light impulse source that repetition rate equals the rate of information throughput.The wide range psec light pulse that loads user profile is carried out the time domain expansion through linear chirped fiber grating, and the high-power fiber amplifier through the transmitter place carries out the luminous power amplification then.The light signal power output of amplifying is at SBS (stimulated Brillouin scattering) and SRS (stimulated Raman scattering) below the threshold value.Because adopt wide spectrum light source, the SBS threshold value has surpassed the SRS threshold value, so the light signal power output of amplifying is the upper limit with the SRS threshold value.The time domain expansion light signal of this amplification transmits in long-distance optical fiber; Carry out dispersion compensation and place the linear chirp optical fiber grating identical at suitable distance and position with the transmitter place; But its placement direction is opposite; After this processing, time domain expansion light pulse is by compression and back psec light pulse again, and peak power obtains gain (gaining during expansion) owing to pulsewidth is compressed; Corresponding pump light preamplifier far away can be put into farther distance, thereby has realized the extension of non-relay fiber optic transmission system transmission range.Consider the insertion loss (2dB) of optical pulse compressor, gaining when gain can reach the resulting expansion of 24dB, 622Mbit/s speed during resulting expansions of 2.5Gbit/s speed to reach 30dB.Concerning optical fiber (loss 0.20dB/km) G.652,2.5Gbit/s speed can be expanded non-relay apart from 120km, and 622Mbit/s speed can be expanded non-relay apart from 150km; Concerning Pure Silica Core Fiber (loss 0.15dB/km) G.654,2.5Gbit/s speed can be expanded non-relay apart from 160km, and 622Mbit/s speed can be expanded non-relay apart from 200km.In addition, for the light Kerr nonlinearity effect that occurs in the transmission line, the utility model also can adopt full light 2R technology (like nonlinear optical loop mirror technology etc.) that optical pulse waveform is recovered at the receiver place.
Description of drawings
Fig. 1 is the light path system sketch map of the utility model;
Fig. 2 is a kind of light pulse expander of the utility model sketch map;
Fig. 3 is a kind of optical pulse compressor sketch map of the utility model.
Embodiment
Referring to Fig. 1, a kind of non-relay fiber optic transmission system of the utility model comprises optical sender, power amplifier, light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module, optical pulse compressor, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier, nonlinear optical loop mirror and the optical receiver that is connected successively by Transmission Fibers.Be connected with pump pumping source far away on the pump light preamplifier wherein far away, distributed optical fiber Raman amplifier then mainly is made up of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away.Said optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier.The input of radio frequency amplifier links to each other with user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.The output of power amplifier connects the light pulse expander, and the output of light pulse expander links to each other with high-power fiber amplifier through optical filter.The output of high-power fiber amplifier links to each other with dispersion compensation module through the first long distance optical fiber.The output of dispersion compensation module connects optical pulse compressor, and the output of optical pulse compressor is connected to one of them input of pump light preamplifier far away.Another input of pump light preamplifier far away links to each other with pump pumping source far away, and the output of pump light preamplifier far away links to each other with an input of wavelength division multiplexer through the second long distance optical fiber.Another input of wavelength division multiplexer connects raman pump source, and the output of wavelength division multiplexer connects light preamplifier.The output of light preamplifier is connected to optical receiver via nonlinear optical loop mirror.
The utility model light pulse expander is identical substantially with the optical pulse compressor structure.Wherein the light pulse expander is made up of a linear chirp optical fiber grating and an optical circulator; Linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form the input and the output of light pulse expander respectively.Optical pulse compressor also is made up of a linear chirp optical fiber grating and an optical circulator; Linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form the input and the output of optical pulse compressor respectively.For can be with the light pulse after time domain expansion compression and back picopulse again, above-mentioned optical pulse compressor and the identical linear chirp optical fiber grating of light pulse expander employing, but it is when being connected on the corresponding annular device, its placement in the opposite direction.Referring to Fig. 2 and Fig. 3.
In the utility model preferred embodiment, the Repetition Frequency Laser device of being selected for use is a mode locked fiber laser.Said power amplifier, pump light preamplifier far away and light preamplifier are all selected erbium-doped fiber amplifier for use; High-power fiber amplifier is then selected erbium/ytterbium co-doped fiber amplifier for use.
Be example with G.654 Pure Silica Core Fiber, 2.5Gbit/s transmission rate below, come the utility model preferred embodiment is elaborated:
It is the light pulse of 2.5GHz that the Repetition Frequency Laser device produces repetition, and signal to noise ratio is greater than 50dB, and spectrum 3dB width is about 3.5nm, and pulsewidth is 1ps.This repetition light pulse sequence gets into intensity modulator, and user's light signal of 2.5Gbit/s speed is that the signal of telecommunication amplifies rear drive intensity modulator generation user's binary switch keying (OOK) modulated light signal through radio frequency amplifier through light-to-current inversion.User profile promptly is loaded on the picopulse of Repetition Frequency Laser.
The picopulse sequence of carrying user profile is carried out the pulse power adjustment through power amplifier, gets into the light pulse expander that is made up of linear chirp optical fiber grating and circulator the wide range pulse is carried out the linear chrip broadening to nanosecond order.The light pulse sequence entering three dB bandwidth of time domain broadening is that the logical optical filter of band of 0.1nm carries out filtering, and output spectral width is 0.1nm, and pulse duration is the light pulse sequence of 400ps.The high-power fiber amplifier that this pulse train entering erbium/ytterbium is mixed altogether is with Pulse Power Magnification.The low-loss big mode field area that the light pulse sequence that amplifies gets into first long distance as input signal G.654 optical fiber transmits.Be designed into fiber optical power and be lower than stimulated Raman scattering (SRS) threshold value, to avoid the appearance of SRS effect.Because the spectrum width of light pulse is 0.1nm, is far longer than the brillouin gain bandwidth of stimulated Brillouin scattering (SBS), and the excited Brillouin threshold value is improved greatly, has effectively suppressed the generation of SBS effect.
With dispersion compensation module dispersion compensation is carried out in light pulse after the G.654 Optical Fiber Transmission through the long distance of first section low-loss, the light pulse after the compensation is compressed to the 1ps pulsewidth through optical pulse compressor with the light pulse of 400ps pulsewidth.Gain will embody during the expansion of light pulse here; Because optical pulse width has been pressed narrow 400 times; The peak power of light pulse gains in the time of will obtaining the expansion of 26dB, and the peak power of small-signal can be reached more than the input sensitivity of pump light preamplifier far away.
Subsequently; Light signal gets into pump light preamplifier far away the peak power of picopulse light signal is amplified into the G.654 Optical Fiber Transmission of second section longer distance, and distributed optical fiber Raman amplifier further amplifies and improve signal to noise ratio to the light signal that in second section optical fiber, transmits.
After second section Optical Fiber Transmission, because the optical pulse broadening that CHROMATIC DISPERSION IN FIBER OPTICS makes 1ps is to about the 300ps, this pulse duration can be suitable for the Clock Extraction of receiver preferably, so that the data decision of " 1 " and " 0 " bit.Because optical fiber dispersion causes optical pulse broadening and fiber transmission attenuation that the light signal peak power is reduced; The preposition image intensifer of light that light signal gets into before the receiver carries out the amplification of light pulse small-signal; Carry out the shaping of light pulse through nonlinear optical loop mirror, modulate light Kerr nonlinearity effects light pulse with elimination cross-phase in phase modulated and band.At last, the light pulse after the shaping gets into optical receiver and recovers user profile.
Like this; This transmission system adopts the picosecond optical pulse broadening and the compress technique of novel concept; Gain when obtaining extra expansion; In conjunction with pump light preamplifier far away, distributed optical fiber Raman amplifier and utilize the G.654 big mode field area and the low transmission loss characteristic of optical fiber, the non-relay fiber optic transmission system of long distance that can realize adopting optical fiber G.652 to realize.This system has avoided the use of pump EDFA power amplifier far away.
Claims (4)
1. non-relay fiber optic transmission system comprises the optical sender, power amplifier, pump light preamplifier far away, distributed optical fiber Raman amplifier, light preamplifier and the optical receiver that are connected successively by Transmission Fibers; Be connected with pump pumping source far away on the pump light preamplifier wherein far away, distributed optical fiber Raman amplifier then mainly is made up of the optical signal transmission optical fiber behind raman pump source, wavelength division multiplexer and the pump light preamplifier far away; It is characterized in that also further comprising: the light pulse expander, optical filter, high-power fiber amplifier, dispersion compensation module and the optical pulse compressor that connect successively by Transmission Fibers;
Wherein light pulse expander and optical pulse compressor constitute by a linear chirp optical fiber grating and an optical circulator; Linear chirp optical fiber grating is connected on second port of optical circulator, and first port of optical circulator and the 3rd port form the input and the output of light pulse expander or optical pulse compressor respectively; Above-mentioned optical pulse compressor and light pulse expander adopt identical linear chirp optical fiber grating, but it is when being connected on the corresponding annular device, its placement in the opposite direction;
Power amplifier is connected with the light pulse expander; Optical pulse compressor links to each other with pump light preamplifier far away; Be provided with a long distance optical fiber between high-power fiber amplifier and the dispersion compensation module, be provided with another long distance optical fiber between pump light preamplifier far away and the distributed optical fiber Raman amplifier.
2. non-relay fiber optic transmission system according to claim 1 is characterized in that: said high-power fiber amplifier is erbium/ytterbium co-doped fiber amplifier.
3. non-relay fiber optic transmission system according to claim 1 and 2 is characterized in that: said optical sender mainly is made up of Repetition Frequency Laser device, intensity modulator and radio frequency amplifier; The input of radio frequency amplifier links to each other with user profile, and the output of the output of radio frequency amplifier and Repetition Frequency Laser device is connected on 2 inputs of intensity modulator, and the output of intensity modulator is connected with power amplifier.
4. non-relay fiber optic transmission system according to claim 1 and 2 is characterized in that: also be serially connected with nonlinear optical loop mirror between said light preamplifier and the optical receiver.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120283506XU CN202160181U (en) | 2011-08-05 | 2011-08-05 | No-repeater optical fiber transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120283506XU CN202160181U (en) | 2011-08-05 | 2011-08-05 | No-repeater optical fiber transmission system |
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| CN202160181U true CN202160181U (en) | 2012-03-07 |
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| CN201120283506XU Expired - Fee Related CN202160181U (en) | 2011-08-05 | 2011-08-05 | No-repeater optical fiber transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049123A (en) * | 2015-07-01 | 2015-11-11 | 武汉光迅科技股份有限公司 | Bidirectional remote pump transmission system sharing remote gain units |
| CN105553559A (en) * | 2016-01-05 | 2016-05-04 | 烽火通信科技股份有限公司 | Long-distance passive optical network system based on chirp grating and dispersion compensation method |
| CN105762625A (en) * | 2016-05-13 | 2016-07-13 | 无锡市德科立光电子技术有限公司 | Amplifier device capable of being configured and upgraded on site |
| CN112468233A (en) * | 2020-11-23 | 2021-03-09 | 长沙军民先进技术研究有限公司 | System for suppressing phase noise of remote unrepeatered transmission optical fiber hydrophone system |
| CN113544984A (en) * | 2019-07-26 | 2021-10-22 | 京瓷株式会社 | Optical fiber power supply system |
-
2011
- 2011-08-05 CN CN201120283506XU patent/CN202160181U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105049123A (en) * | 2015-07-01 | 2015-11-11 | 武汉光迅科技股份有限公司 | Bidirectional remote pump transmission system sharing remote gain units |
| CN105049123B (en) * | 2015-07-01 | 2017-12-22 | 武汉光迅科技股份有限公司 | Share the two-way distant pump Transmission system of remote gain unit |
| CN105553559A (en) * | 2016-01-05 | 2016-05-04 | 烽火通信科技股份有限公司 | Long-distance passive optical network system based on chirp grating and dispersion compensation method |
| CN105762625A (en) * | 2016-05-13 | 2016-07-13 | 无锡市德科立光电子技术有限公司 | Amplifier device capable of being configured and upgraded on site |
| CN105762625B (en) * | 2016-05-13 | 2018-08-21 | 无锡市德科立光电子技术有限公司 | It is a kind of can situ configuration and upgrading amplifier installation |
| CN113544984A (en) * | 2019-07-26 | 2021-10-22 | 京瓷株式会社 | Optical fiber power supply system |
| CN113544984B (en) * | 2019-07-26 | 2023-10-13 | 京瓷株式会社 | Optical fiber power supply system |
| CN112468233A (en) * | 2020-11-23 | 2021-03-09 | 长沙军民先进技术研究有限公司 | System for suppressing phase noise of remote unrepeatered transmission optical fiber hydrophone system |
| CN112468233B (en) * | 2020-11-23 | 2022-04-15 | 长沙军民先进技术研究有限公司 | System for suppressing phase noise of remote unrepeatered transmission optical fiber hydrophone system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20130805 |