CN201985866U - Frequency response equalizing device by using Brillouin processing of optical carrier wave - Google Patents
Frequency response equalizing device by using Brillouin processing of optical carrier wave Download PDFInfo
- Publication number
- CN201985866U CN201985866U CN2011200152379U CN201120015237U CN201985866U CN 201985866 U CN201985866 U CN 201985866U CN 2011200152379 U CN2011200152379 U CN 2011200152379U CN 201120015237 U CN201120015237 U CN 201120015237U CN 201985866 U CN201985866 U CN 201985866U
- Authority
- CN
- China
- Prior art keywords
- light
- polarization controller
- frequency response
- output
- optically connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model relates to a frequency response equalizing device by using Brillouin processing of optical carrier wave. The present phase modulation link can not obtain flat frequency response. In the utility model, a laser is optically connected with an input end of an optical coupler, an output end of the optical coupler is optically connected with one end of a first polarization controller, the other end of the first polarization controller is optically connected with a light input end of an electro-optics phase modulator, an output end of the electro-optics phase modulator is optically connected with one end of a single-mode fiber, and the other end of the single-mode fiber is optically connected with a port 2 of a circulator. The other output end of the optical coupler is optically connected with one end of a second polarization controller, the other end of the second polarization controller is optically connected with a light input end of the modulator, A light output end of the modulator is optically connected with an input end of an optical erbium-doped amplifier, an output end of the optical erbium-doped amplifier is optically connected with a port 1 of the circulator, and a port 3 of the circulator is optically connected with an input end of an optical high speed detector. The utility model realizes a transformation from phase to intensity, and obtains frequency response equalization with adjustable bandwidth.
Description
Technical field
The utility model relates to the radio frequency fiber optic communication field, relates in particular to a kind of frequency response balancer that utilizes light carrier Brillouin to handle.
Background technology
Adopt optical fiber link Transmission Microwave signal between console for centralized control and distributed base station, have advantages such as high bandwidth, light weight, small size and strong anti-electromagnetic interference capability, just becoming systematic research focuses such as ultra broadband two-forty mobile communication, super wideband wireless access.Usually we adopt two kinds of modulators that microwave signal is modulated on the light carrier: intensity modulator and phase-modulator.The linear modulation zone of intensity modulator is narrower, and the light carrier modulation depth is less, and needs biasing circuit that dc offset voltage is provided.When real work, surface charge that the direct current biasing point can cause because of the pyroelectricity of working temperature, lithium columbate crystal migration and have SiO
2Resilient coating and drifting about, thus make link performance change.Therefore need a complicated circuit to solve the drifting problem of direct current biasing point.Phase-modulator does not need direct current biasing, and the insertion loss is low, and the linearity of modulation signal and light phase is good, and therefore the application of phase-modulator in recent years more and more widely.But microwave signal after electro-optic phase modulator modulation, its ± phase difference of 1 rank sideband is p, the signal of telecommunication of demodulation was cancelled out each other when these characteristics made two sidebands and light carrier beat frequency.Therefore, in the phase modulated link, need the transition device of a stable and effective phase place to intensity.So far, be used for realizing that phase modulated link phase place comprises to the method for intensity transformation: utilize the optical fiber of chromatic dispersion to change the phase place of two sidebands, use fiber grating or Brillouin to amplify to break ± balance of 1 rank sideband amplitude and use to interfere and detect or the like.In these methods, utilizing CHROMATIC DISPERSION IN FIBER OPTICS is the most direct, the simplest a kind of method that should go, because the most frequently used to come the monomode fiber of transmitting radio frequency signal be exactly the optical fiber of chromatic dispersion, its Relative Zero dispersive optical fiber cost is lower.But, in the phase modulated link, though fiber dispersion effects can be broken the phase difference of phase modulated signal ± 1 rank sideband p, can be relevant with frequency, optical fiber kind and the fiber lengths of modulation signal by the sideband phase difference that fiber dispersion effects is introduced, therefore, under fixed fiber and fiber lengths situation, the phase modulated link that utilizes fiber dispersion effects to realize that phase place changes to intensity can not obtain the flat frequency response.And in a lot of the application, broadband frequency response equilibrium is necessary.Therefore, the frequency response that how to improve the phase modulated link has very important significance for the application in super broad band radio communication system.
Stimulated Brillouin scattering (SBS) is pumping wave in the optical fiber, the stokes wave nonlinear effect by the sound wave effect.Pumping wave produces sound wave by electrostriction, causes the periodic modulation of medium refraction index, produces two coupling effects during this.One, the refractive-index grating that causes of pumping is by Bragg diffraction scattering pump light, produced the brillouin gain spectrum that frequency moves down Brillouin shift; The 2nd, stokes wave will cause Brillouin's loss spectra of frequency upper shift Brillouin shift.No matter be brillouin gain or loss, in changes in amplitude, all be accompanied by the nonlinear change of phase place.And power, frequency and fiber type, the fiber lengths of the amplification quantity of stokes wave and the waste of pumping wave and respective phase variation and stokes wave, pumping wave all have relation.Amplitude that is caused by the Brillouin scattering effect and phase change are widely used in the signal processing in the light territory in recent years.
Summary of the invention
The purpose of this utility model is to provide a kind of phase modulated link frequency response balancing device, by the phase control to light carrier in the phase modulated signal, eliminates effect of dispersion to the unbalanced influence of radio-frequency power, realizes adjustable broadband frequency response equilibrium.
The utility model technical solution technical scheme that problem is taked is:
A kind of frequency response balancer that utilizes light carrier Brillouin to handle comprises Distributed Feedback Laser, 1 * 2 optical coupler, first Polarization Controller, second Polarization Controller, electro-optic phase modulator, monomode fiber, Mach-Zehnder modulators, beche-de-mer without spike erbium amplifier, circulator and light high speed detector.
The output of Distributed Feedback Laser is connected with the input light of 1 * 2 optical coupler, an output of 1 * 2 optical coupler is connected with an end light of first Polarization Controller, the other end of first Polarization Controller is connected with electro-optic phase modulator light input end light, the electro-optic phase modulator light output end is connected with monomode fiber one end light, and the monomode fiber other end is connected with 2 mouthfuls of light of circulator.
Another output of 1 * 2 optical coupler is connected with an end light of second Polarization Controller, the other end of second Polarization Controller is connected with Mach-Zehnder modulators light input end light, the Mach-Zehnder modulators light output end is connected with beche-de-mer without spike erbium amplifier input light, and beche-de-mer without spike erbium amplifier output is connected with 1 mouthful of light of circulator.
3 mouthfuls of circulator are connected with light high speed detector input light.
The modulation signal that constitutes light carrier pumping wave and stokes wave inputs to Mach-Zehnder modulators signal of telecommunication end, the frequency microwave signal inputs to the electro-optic phase modulator electrical input, the frequency microwave signal of light high speed detector output output after the frequency response equilibrium.
The beneficial effects of the utility model: the utility model is by Brillouin's signal processing of light carrier, reduced the influence of fiber dispersion effects to the decay of phase modulated chain way RF power, inherited the advantage of using electro-optic phase modulator, realized of the transformation of effective phase place, obtained the adjustable frequency response equilibrium of bandwidth to intensity.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 utilizes Brillouin scattering to realize light carrier phase change schematic diagram;
Fig. 3 be light carrier phase place no change and variation-pi/6 ,-when pi/3, pi/6 and pi/3, the modulation of 0-20GHz frequency microwave signal phase is after the system frequency response simulation result after the transmission of 25km monomode fiber.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
The phase change of light carrier is realized by the optical fiber Brillouin scattering in the utility model, utilize brillouin gain and Brillouin's attenuation effect of light carrier simultaneously, rationally adjust pumping wave and Stokes wave frequency and amplitude, make that brillouin gain and Brillouin's decling phase of light carrier amplitude supports in the phase modulated link, the light carrier amplitude is constant, the nonlinear phase variation effect that two kinds of effects cause and brillouin gain and Brillouin decay is consistent, the phase place that guarantees light carrier in very large range changes, thereby realize the adjustable equilibrium of phase modulated link frequency response in the different frequency scope, eliminate the influence of fiber dispersion effects, guarantee the performance of wide band radio-frequency optical fiber link the link frequency response.
As shown in Figure 1, the light of Distributed Feedback Laser 1 emission is divided into two-way through optical coupler 2, one the tunnel behind Polarization Controller 3-1, radiofrequency signal order mode fiber 7 transmission after electro-optic phase modulator 4 modulation, other one the tunnel behind Polarization Controller 3-2, the modulation signal that constitutes light carrier pumping wave and stokes wave
f P After the modulation of Mach-Zehnder modulators 5 double-side band carrier suppressed, produce the pumping wave and the stokes wave of the Brillouin scattering of light carrier in the phase modulated signal, after connect beche-de-mer without spike erbium amplifier 6 and adjust its power, by optical circulator 8 reverse transfer to monomode fiber 7, brillouin gain and Brillouin's decay of light carrier take place on monomode fiber, make that the amplitude of phase modulated signal light carrier is constant, and phase place dynamically changes, and connects high speed photodetector 9 and survey after the signal after the Optical Fiber Transmission is by optical circulator.
Utilize brillouin gain and Brillouin's attenuation effect of light carrier simultaneously, guarantee that phase modulated signal light carrier amplitude is constant but principle phase change is seen Fig. 2.Among the figure:
f P Expression constitutes the modulation signal of light carrier pumping wave and stokes wave;
f b The Brillouin shift of expression optical fiber.Modulating frequency is
f P The signal of telecommunication obtain being distributed in the light carrier both sides through Mach-Zehnder electrooptic modulator double-side band carrier suppressed modulation, the optical frequency difference is
f P Pumping wave and stokes wave, when they oppositely incided monomode fiber, brillouin gain and Brillouin scattering effect took place in light carrier simultaneously, rationally adjusted
f P , make it drop within the bandwidth of brillouin gain spectrum and loss spectra, can be so that the amplitude gain of light carrier and loss be offset, and corresponding phase change superpose, thus the light carrier amplitude is constant in the assurance phase modulated signal, and phase place is adjustable.
The frequency microwave signal
fModulate through electro-optic phase modulator, after being the frequency response of calculating behind the monomode fiber transmission 25km of 16 ps/nm * km, abbe number sees curve among Fig. 3, among the figure: curve a is light carrier phase place frequency response curve when not changing, frequency response curve when curve b is a light carrier phase change-pi/6, frequency response curve when curve c is a light carrier phase change-pi/3, frequency response curve when frequency response curve when curve d is light carrier phase change pi/6, curve e are light carrier phase change pi/3.
As seen in 0-20 GHz scope, the frequency response of link is very uneven, when radio frequency signal frequency is very low, the radiofrequency signal power that obtains through the phase modulated link transmission almost detect less than, in the whole frequency range, its minimum and firing frequency power difference 80dB.B, c among Fig. 3, d, e curve respectively corresponding phase modulation signal light carrier amplitude change-pi/6 ,-frequency response of link when pi/3, pi/6 and pi/3.Obviously, the change of light carrier phase place can well improve the frequency response of link, and different light carrier phase change can realize the frequency equilibrium in the different bandwidth.The utility model utilizes the optical fiber Brillouin scattering to realize adjustable light carrier phase change very on a large scale, thereby can improve the frequency response of phase modulated link well.
Claims (1)
1. frequency response balancer that utilizes light carrier Brillouin to handle, comprise Distributed Feedback Laser, 1 * 2 optical coupler, first Polarization Controller, second Polarization Controller, electro-optic phase modulator, monomode fiber, Mach-Zehnder modulators, the beche-de-mer without spike erbium amplifier, circulator and light high speed detector, it is characterized in that: the output of Distributed Feedback Laser is connected with the input light of 1 * 2 optical coupler, an output of 1 * 2 optical coupler is connected with an end light of first Polarization Controller, the other end of first Polarization Controller is connected with electro-optic phase modulator light input end light, the electro-optic phase modulator light output end is connected with monomode fiber one end light, and the monomode fiber other end is connected with 2 mouthfuls of light of circulator;
Another output of 1 * 2 optical coupler is connected with an end light of second Polarization Controller, the other end of second Polarization Controller is connected with Mach-Zehnder modulators light input end light, the Mach-Zehnder modulators light output end is connected with beche-de-mer without spike erbium amplifier input light, and beche-de-mer without spike erbium amplifier output is connected with 1 mouthful of light of circulator;
3 mouthfuls of circulator are connected with light high speed detector input light;
The modulation signal that constitutes light carrier pumping wave and stokes wave inputs to Mach-Zehnder modulators signal of telecommunication end, the frequency microwave signal inputs to the electro-optic phase modulator electrical input, the frequency microwave signal of light high speed detector output output after the frequency response equilibrium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200152379U CN201985866U (en) | 2011-01-18 | 2011-01-18 | Frequency response equalizing device by using Brillouin processing of optical carrier wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200152379U CN201985866U (en) | 2011-01-18 | 2011-01-18 | Frequency response equalizing device by using Brillouin processing of optical carrier wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201985866U true CN201985866U (en) | 2011-09-21 |
Family
ID=44613316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200152379U Expired - Lifetime CN201985866U (en) | 2011-01-18 | 2011-01-18 | Frequency response equalizing device by using Brillouin processing of optical carrier wave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201985866U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102539380A (en) * | 2011-12-29 | 2012-07-04 | 浙江大学 | Inclined grating sensor based on stimulated brillouin scattering |
| CN103645371A (en) * | 2013-12-20 | 2014-03-19 | 电子科技大学 | Device and method for measuring half-wave voltage of electro-optic phase modulator |
| CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
-
2011
- 2011-01-18 CN CN2011200152379U patent/CN201985866U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075258A (en) * | 2011-01-18 | 2011-05-25 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102075258B (en) * | 2011-01-18 | 2014-02-19 | 汉鼎信息科技股份有限公司 | Frequency response balancer by using light carrier Brillouin treatment |
| CN102539380A (en) * | 2011-12-29 | 2012-07-04 | 浙江大学 | Inclined grating sensor based on stimulated brillouin scattering |
| CN102539380B (en) * | 2011-12-29 | 2013-07-24 | 浙江大学 | Inclined grating sensor based on stimulated brillouin scattering |
| CN103645371A (en) * | 2013-12-20 | 2014-03-19 | 电子科技大学 | Device and method for measuring half-wave voltage of electro-optic phase modulator |
| CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
| CN109724634B (en) * | 2018-12-29 | 2022-01-18 | 武汉光谷互连科技有限公司 | Optical coherent receiving method with automatic polarization equalization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ackerman et al. | Signal-to-noise performance of two analog photonic links using different noise reduction techniques | |
| Morrison et al. | Tunable microwave photonic notch filter using on-chip stimulated Brillouin scattering | |
| Chen et al. | Chirp and dispersion tolerance of a single-drive push–pull silicon modulator at 28 Gb/s | |
| CN104216196B (en) | Tunable all-optical microwave photon frequency conversion device without external electric local oscillator | |
| CN102064890B (en) | Ultra-long single span optical transmission method based on polarization multiplexing push-pull modulation encoding | |
| CN102347797A (en) | Multifunctional optical signal processing system | |
| CN102075258B (en) | Frequency response balancer by using light carrier Brillouin treatment | |
| Tahhan et al. | Characteristics of dispersion compensation for 32 channels at 40 Gb/s under different techniques | |
| CN105091776A (en) | Fiber laser static-state strain beat frequency demodulation system based on single-sideband frequency sweep modulation | |
| CN104330939A (en) | SBS broadband tunable optical fiber delay system | |
| CN201985866U (en) | Frequency response equalizing device by using Brillouin processing of optical carrier wave | |
| CN103763022A (en) | High spatial resolution optical frequency domain reflectometer system based on high-order sideband frequency sweeping modulation | |
| CN107947867B (en) | Single-sideband spectrum generation device and method based on multi-frequency phase modulation | |
| CN102932063A (en) | Analogue link dispersion compensation scheme based on double-sideband modulation | |
| Peng et al. | A novel method to realize optical single sideband modulation with tunable optical carrier to sideband ratio | |
| Parida | Fiber Bragg grating as a dispersion compensator in an optical transmission system using optisystem software | |
| Ali | Performance comparison between direct and external modulation using RZ and NRZ coding | |
| CN104597687A (en) | Optical single-side band modulation device and method | |
| Verma et al. | Comparative analysis of self phase modulation (SPM) and cross phase modulation (CPM) | |
| CN103501198B (en) | A kind of dispersion compensation method based on time reversal | |
| Bravetti et al. | Chirp-inducing mechanisms in Mach-Zehnder modulators and their effect on 10 Gb/s NRZ transmission studied using tunable-chirp single drive devices | |
| Qian et al. | Seamless all-optical bidirectional wavelength converter | |
| Das et al. | A novel radio over fiber system for long haul single mode fiber transmission | |
| Sultana et al. | Analysis of XPM effect with SPM and GVD in WDM fiber optic transmission system | |
| Huszanik et al. | On the impact of fiber nonlinear effects on the CP-DQPSK modulated ultra DWDM system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110921 Effective date of abandoning: 20140219 |
|
| RGAV | Abandon patent right to avoid regrant |