CN109842447A - A kind of straight tunable light emission machine inhibited with SBS - Google Patents
A kind of straight tunable light emission machine inhibited with SBS Download PDFInfo
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- CN109842447A CN109842447A CN201711209569.9A CN201711209569A CN109842447A CN 109842447 A CN109842447 A CN 109842447A CN 201711209569 A CN201711209569 A CN 201711209569A CN 109842447 A CN109842447 A CN 109842447A
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Abstract
The invention discloses a kind of straight tunable light emission machines inhibited with SBS, built-in SBS suppression circuit on the basis of straight tunable light emission machine, the input of SBS suppression circuit terminates the control circuit of straight tunable light emission machine, come the frequency range and amplitude size of control signal generator output signal, Distributed Feedback Laser is inputed to after the bias current combining of output end and laser, it by this method will be on the biasing circuit of this signal modulation to Distributed Feedback Laser, so that the breadth of spectrum line of Distributed Feedback Laser output light wave increases, to improve the SBS threshold of straight tunable light emission machine, so that the transmission range of straight tunable light emission machine is no longer limited by the SBS threshold of laser itself, thus fiber amplifier can be connect behind straight tunable light emission machine, improve incident optical power, so transmission range increases substantially.
Description
Technical field
The present invention relates to cable television technology fields, more particularly to one kind to have SBS (Stimulated Brillouin
Scattering, stimulated Brillouin scattering) inhibit straight tunable light emission machine.
Background technique
With the development of cable television, the optical sender of most 1310nm wave band will upgrade to the light of 1550nm wave band
Because the light of 1550nm wave band optical fiber attenuation in long distance transmission is less, and WDM can be used in transmitter
(Wavelength division multiplexing, wavelength-division multiplex) transmits analog and digital signal, so that 1550nm wave
Multi-wavelength's light of section can transmit in same root optical fiber, can substantially reduce the cost for being laid with long-distance optical fiber, be more suitable for remote
Distance Transmission.But in non-relay optical transmission system over long distances, for the optical signal to noise ratio for improving receiving end, after straight tunable light emission machine
Face will generally connect fiber amplifier, improve incident optical power and carry out compensated optical fiber loss, however higher incident optical power can draw
The nonlinear effect in optical fiber is played, SBS is exactly one such nonlinear effect.But the threshold power of SBS is relatively low, generally
For 7~8dBm, in order to ensure the best transmission of system, the incident optical power of system can only be limited in SBS threshold hereinafter, limiting
The extension of transmission range.Therefore, the optical sender in long haul transmission system, especially straight tunable light emission machine inhibit with SBS
Ability is very important.
The existing method for inhibiting SBS is typically all directly to be handled in area of light light, for example imitated using Raman amplifiction
SBS threshold should be improved, but the higher cost of raman amplifier, unsuitable batch commercialization are only applied in some special occasions.
Summary of the invention
In order to solve the technical problems in background technology, the invention proposes a kind of straight light modulations inhibited with SBS
Transmitter can effectively inhibit the generation of SBS, improve the stability of system, extend transmission distance.
A kind of straight tunable light emission machine inhibited with SBS proposed by the present invention, comprising:
Laser is converted into optical signal after directly modulating received radiofrequency signal, is exported by optical output port；
At least one signal generator is connect, in the set of frequency interface and amplitude of central controller setting interface
It entreats controller that frequency and amplitude that interface distinguishes control signal generator are set by set of frequency interface and amplitude, generates bandwidth
Except low-frequency ac signal；
Combiner, input side are connect with the delivery outlet of the bias current control interface of central controller and signal generator respectively,
Laser will be inputed to after the bias current of laser and low-frequency ac signal combining.
Preferably, further includes:
First adjustable radio frequency attenuator receives the radiofrequency signal obtained through rf inputs mouth, to the function of the radiofrequency signal
Rate decays；
Second radio frequency amplifier, input terminal is connect with the first adjustable radio frequency attenuator output end, to the radiofrequency signal of input
It amplifies；
Second adjustable radio frequency attenuator is connect with the output end of the second radio frequency amplifier, is carried out to the radiofrequency signal of input
Decaying, inputs laser after decaying；
Central controller connect with the first adjustable radio frequency attenuator and the second adjustable radio frequency attenuator respectively, controls respectively
The attenuation of first adjustable radio frequency attenuator and the second adjustable radio frequency attenuator.
Preferably, further includes: the first radio frequency amplifier, be connected to rf inputs mouth and the first adjustable radio frequency attenuator it
Between.
Preferably, string has barrier inductance L2 between the bias current control interface and combiner input terminal of central controller.
Preferably, string has inductance L1 between combiner output end and the bias current input terminal of laser.
Preferably,
Laser is coaxial laser, the Distributed Feedback Laser of butterfly or EML laser.
Preferably, the radio frequency input pin of laser inputs low-frequency ac signal.
In the present invention, built-in SBS suppression circuit, SBS suppression circuit input termination on the basis of straight tunable light emission machine
The control circuit of straight tunable light emission machine, comes the frequency range and amplitude size of control signal generator output signal, output end with
Distributed Feedback Laser is inputed to after the bias current combining of laser, by this method by the biased electrical of this signal modulation to Distributed Feedback Laser
On the road, so that the breadth of spectrum line of Distributed Feedback Laser output light wave increases, to improve the SBS threshold of straight tunable light emission machine, SBS
Threshold value adjustable range is 10dBm~18dBm, so that the transmission range of straight tunable light emission machine is no longer limited by laser itself
SBS threshold, thus fiber amplifier can be connect behind straight tunable light emission machine, incident optical power is improved, so transmission range is substantially
Degree improves.
Detailed description of the invention
Fig. 1 is a kind of straight tunable light emission machine structure chart inhibited with SBS that the embodiment of the present invention 1 proposes；
Fig. 2 is the straight tunable light emission machine structure chart that there is the another kind that the embodiment of the present invention 2 proposes SBS to inhibit；
Fig. 3 is the schematic diagram of SBS suppression circuit in the embodiment of the present invention；
Fig. 4 is the straight tunable light emission machine that inhibits without SBS to be entered under length is 20km fiber condition in the light of 16dBm, is not added
The bottom of test link when input signal is made an uproar spectrogram；
Fig. 5 is that the bottom of system that the straight tunable light emission machine that there is SBS to inhibit is tested under the same conditions is made an uproar spectrogram；
Fig. 6 is the change for the MER radio frequency incoming level that the embodiment of the present invention is tested under the conditions of different incident optical powers
Change curve graph；
Fig. 7 is when SBS threshold to be transferred to 10dBm, 12dBm, 14dBm, 16dBm and 18dBm respectively, it is corresponding enter fibre
The change curve for the MER radio frequency incoming level tested under the conditions of optical power.
Specific embodiment
The embodiment of the present invention 1 proposes a kind of straight tunable light emission machine inhibited with SBS, as shown in Figure 1, comprising: first
Adjustable radio frequency attenuator (Tunable RF attenuator1) 10, reception are obtained through rf inputs mouth (RF input port)
The radiofrequency signal obtained, inputs to radio frequency amplifier (RF Amplifier) 20 after decaying to the power of the radiofrequency signal；The
Two radio frequency amplifiers 20, input terminal are connect with 10 output end of the first adjustable radio frequency attenuator, are put to the radiofrequency signal of input
Greatly；Second adjustable radio frequency attenuator (Tunable RF attenuator2) 30 connects with the output end of the second radio frequency amplifier 20
It connects, decays to the radiofrequency signal of input；(Distributed feedback laser, distributed Feedback swash DFB laser
Light device) 40, it is connect with the second adjustable radio frequency attenuator 30, is converted into optical signal after carrying out the direct modulation of radio frequency, it is defeated by light
Exit port (Optical output) output.Central controller (Control) 50, respectively with the first adjustable radio frequency attenuator 10 and
The connection of second adjustable radio frequency attenuator 30, controls the first adjustable radio frequency attenuator 10 and the second adjustable radio frequency attenuator 30 respectively
Attenuation；Signal generator (Signal Generator) 60 is arranged with the set of frequency interface and amplitude of central controller 50
The frequency that interface distinguishes control signal generator is arranged by set of frequency interface and amplitude by central controller 50 in interface connection
And amplitude, signal generator 60 generate low-frequency ac signal Dither, such as sine wave, square wave, triangular wave etc. except bandwidth；
Combiner 70, input side respectively with the bias current control interface of central controller 50 (Bias Control) and signal generator 60
Delivery outlet connection, by bias current control interface (Bias Control) control laser bias current, by the bias current of laser with it is low
DFB laser is inputed to after the combining of frequency AC signal, low-frequency ac signal Dither inputs to directly modulated lasers, plays SBS
Inhibiting effect.
The embodiment of the present invention 2 proposes another straight tunable light emission machine that there is SBS to inhibit, as shown in Figure 2.With Fig. 1's
Difference is, and: Fig. 2 is after issuing two low-frequency ac signal Dither1 and Dither2 combinings using two signal generators, defeated
Enter to directly modulated lasers, inhibits SBS effect.In Fig. 2 Control central controller by Frequency set1 and
Frequency set2 and Amplitude set1 and Amplitude set2 distinguishes control signal generator Signal
The frequency and amplitude of Generator1 and Signal Generator2.
In the present invention, Fig. 1 connects the connection type being not only restricted in functional block diagram with the radio frequency link in Fig. 2, can be
The first radio frequency attenuator+the+the second radio frequency attenuator of radio frequency amplifier+laser connection type in Fig. 1 and Fig. 2, can also be with
It is first the+the second radio frequency attenuator of radio frequency amplifier the+the second radio frequency amplifier of the+the first radio frequency attenuator+this connection of laser
Mode can also be other connection type.
Fig. 3 is the schematic diagram of SBS suppression circuit in the embodiment of the present invention.Drive RF to of the radio frequency of laser from the left side
The input of the port Laser, laser Laser is given in injection after capacitance C and build-out resistor R.Be on the right of Fig. 3 bias current control and
SBS suppression circuit, bias current control are inputted by the port Bias Control, low-frequency ac signal by inductance L2 and by a small margin
Dither is combined through combiner Combiner and then inputs to laser Laser by inductance L1.The effect of capacitor C is logical
AC signal obstructs direct current signal, i.e. radiofrequency signal can be injected by capacitor C to laser, but the Bias of the right input
Control direct current signal is obstructed by capacitor C, will not influence radiofrequency signal.The effect of resistance R is impedance matching, because of the invention
The RF impedance of straight tunable light emission machine is 75ohm, and the impedance of laser light emitting diode is not 75ohm, so passing through resistance R
To realize impedance matching.Inductance L1 plays the role of logical direct current signal, obstructs part AC signal, inputs to the radio frequency of laser
Signal is just blocked to L1, does not interfere with the direct current signal of Bias Control, and bias current control signal Bias
Control can provide bias current to laser by L1, but low-frequency ac signal Dither by a small margin can be inputed to by L1
Laser.Combiner is combiner, and effect is to be combined the Bias Control bias current provided and Dither signal, is combined it
Laser is inputed to by L1.There are two the effects of inductance L2, first is that barrier Dither signal, prevents it from interfering Bias
Control influences the bias current control of laser；Second is that logical Bias Control DC control signal.Dither is by a small margin
Low-frequency ac signal can be sine wave signal, square-wave signal, be also possible to triangular signal, these are all in packet of the invention
Containing range, frequency range is from 1KHz~5MHz, and amplitude range is from 1mV~5V.Dither signal is that the signal generator in Fig. 1 produces
Raw, the frequency for generating signal can be controlled by the Control in Fig. 1 or Fig. 2 and setting generates the amplitude of signal.
Fig. 4 is the straight tunable light emission machine without SBS inhibition in the case where the light of 16dBm enters length for 20km fiber condition, is not added
The bottom of test link when input signal is made an uproar spectrogram, from spectrogram as can be seen that because relatively high power light input optical fibre, deposit
In SBS nonlinear effect, after the light that receiver receives is converted to radio frequency, bottom, which is made an uproar, to be elevated very much.And Fig. 5 is with SBS suppression
The bottom of system that the straight tunable light emission machine of system is tested under the same conditions is made an uproar spectrogram, as seen from Figure 4, because there are SBS inhibition
Effect, bottom are made an uproar and are pressed substantially.
Fig. 6 is MER (Modulated Error ratio, the tune that the present invention tests under the conditions of different incident optical powers
Error rate processed) radio frequency incoming level change curve.The SBS threshold of the straight tunable light emission machine of this test is debugged to 16dBm.
As seen from the figure, when entering fine optical power less than or equal to 16dBm, the MER curve of left-half, with input radio frequency power
Increase and it is linearly increasing, but when incident optical power be greater than 16dBm when, the MER curve of left-half is but no longer with input power
And linear change, but after the level of input radio frequency power reaches some value, MER is all right suddenly.In Fig. 6
" 19dBm Optic In20km " this root curve, when RF input power is 8dBmV/ch, MER=33.2dB, and work as radio frequency
When input power increases to 9dBmV/ch, MER=38.3dB, RF input power only changes 1dB, the 5dB and MER has improved.
This unexpected variation, the reason is that working as incident optical power because the SBS threshold of the optical sender of this test is set to 16dBm
It has been more than this threshold value of 16dBm when for 19dBm, SBS cannot be suppressed completely, test link when being not added input signal
Bottom is made an uproar can be similar with Fig. 4, and bottom, which is made an uproar, to be elevated, at this moment, if the level of radiofrequency signal is too low, such as the 8dBmV/ch in Fig. 6, still
It cannot inhibit SBS nonlinear effect.When the level of radiofrequency signal rises to 9dBmV/ch, on the basis that SBS threshold is 16dBm
On, reach the critical value that SBS threshold is 19dBm, the SBS nonlinear effect of laser can just be inhibited, so test
MER index just improves suddenly.SBS can also be inhibited by inputting higher radiofrequency signal to optical sender, be added in principle and Fig. 3
Dither signal is the same, is all the injection low-frequency ac signal at the bias current of laser, so that the refractive index of laser is with electric current
Variation and change so that spectrum width broaden.But if inhibiting SBS only by the useful radiofrequency signal of input is improved,
The available input range very little of transmitter, within only 1dB.And in Cable TV Signal Transmission in system, radiofrequency signal
Level can be more big changes, substantially optical power change 0.5dB because optical power slightly fluctuates, and radio-frequency power will change
There is so big variation in 1dB or so, radio-frequency power, rely solely on the level of the useful signal of raising input to inhibit SBS aobvious
It is so unworkable.
Fig. 7 is when SBS threshold to be transferred to 10dBm, 12dBm, 14dBm, 16dBm and 18dBm respectively, it is corresponding enter fibre
The change curve for the MER radio frequency incoming level tested under the conditions of optical power.As seen from Figure 6, different SBS thresholds is arrived in setting
Value, the MER index tested out is also variant, and basic trend is the higher of SBS threshold tune, and peak value MER is also lower.In Fig. 7, SBS
When threshold value is 10dBm, the peak value of MER is 42.4dB, and when SBS threshold is 18dBm, MER is reduced to 38.2dB.Cause this existing
As the reason of it is related with SBS suppressing method of the invention, because be at the bias current of laser inject low-frequency ac signal, be equivalent to
It joined on the light that noise modulated is issued to laser, reducing the carrier-to-noise ratio of system, (carrier-to-noise ratio is used to indicate that carrier wave and makes an uproar
The canonical measure scale of sound relationship).And if SBS threshold is higher, it is necessary to more AC signal Tone, i.e. signal amplitude
It opposite to improve, be equivalent to and more noises are added, so peak value MER can be reduced.To solve this problem, such as Fig. 1 and Fig. 2
In, the present invention is adjusted by Frequency set and Amplitude set by software by central controller Control
The frequency and amplitude that signal generator generates signal are directly arranged when needing how many SBS thresholds by software, flexibly use,
Ensure that system index is optimal.
Of the invention is the AC signal that low frequency is injected at the bias current of laser, for inhibiting straight tunable light emission machine SBS
Effect.This mode for inhibiting straight tunable light emission machine SBS effect (is injected the AC signal of low frequency at the bias current of laser, is used
To inhibit straight tunable light emission machine SBS effect), no matter the type of laser be coaxial laser or butterfly Distributed Feedback Laser,
Either EML laser, as long as it is this inhibit SBS mode it is identical as the present invention, all should protection scope of the present invention it
It is interior.
In further embodiment of this invention, low frequency signal is inputted in the radio frequency input pin of laser or high-frequency signal is used to
Inhibit SBS effect, is not the bias current control pin input in laser.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of straight tunable light emission machine inhibited with SBS characterized by comprising
Laser (40), is converted into optical signal after received radiofrequency signal is directly modulated, is exported by optical output port；
At least one signal generator (60) is connect with the set of frequency interface of central controller (50) and amplitude setting interface,
The frequency and amplitude that interface distinguishes control signal generator are arranged by set of frequency interface and amplitude by central controller (50),
Generate the low-frequency ac signal except bandwidth；
Combiner (70), the input side output with the bias current control interface of central controller (50) and signal generator (60) respectively
Mouthful connection, will the bias current of laser and low-frequency ac signal combining after input to laser (40).
2. the straight tunable light emission machine according to claim 1 inhibited with SBS, which is characterized in that further include:
First adjustable radio frequency attenuator (10) receives the radiofrequency signal obtained through rf inputs mouth, to the function of the radiofrequency signal
Rate decays；
Second radio frequency amplifier (20), input terminal is connect with the first adjustable radio frequency attenuator (10) output end, to the radio frequency of input
Signal amplifies；
Second adjustable radio frequency attenuator (30) is connect, to the radiofrequency signal of input with the output end of the second radio frequency amplifier (20)
Decay, inputs laser (40) after decaying；
Central controller (50) is connect with the first adjustable radio frequency attenuator (10) and the second adjustable radio frequency attenuator (30) respectively,
The attenuation of the first adjustable radio frequency attenuator (10) and the second adjustable radio frequency attenuator (30) is controlled respectively.
3. the straight tunable light emission machine according to claim 2 inhibited with SBS, which is characterized in that further include: the first radio frequency
Amplifier is connected between rf inputs mouth and the first adjustable radio frequency attenuator (10).
4. the straight tunable light emission machine according to claim 1 inhibited with SBS, which is characterized in that central controller (50)
Bias current control interface and combiner (70) input terminal between string have barrier inductance L2.
5. the straight tunable light emission machine according to claim 1 inhibited with SBS, which is characterized in that combiner (70) output
String has inductance L1 between end and the bias current input terminal of laser (40).
6. the straight tunable light emission machine according to claim 1 inhibited with SBS, which is characterized in that
Laser (40) is coaxial laser, the Distributed Feedback Laser of butterfly or EML laser.
7. the straight tunable light emission machine according to claim 1 inhibited with SBS, which is characterized in that laser (40) are penetrated
Frequency input pin inputs low-frequency ac signal.
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| CN201711209569.9A CN109842447A (en) | 2017-11-27 | 2017-11-27 | A kind of straight tunable light emission machine inhibited with SBS |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020081069A1 (en) * | 2000-11-07 | 2002-06-27 | Photon-X, Inc. | Optical fiber transmission systems with suppressed light scattering |
| CN1826739A (en) * | 2003-06-09 | 2006-08-30 | 康宁股份有限公司 | Optical communication system with suppressed sbs |
| CN202535364U (en) * | 2012-01-21 | 2012-11-14 | 北京太平洋莱特科技有限公司 | 1500 nm direct modulation optical transmitter |
| CN104579493A (en) * | 2015-01-14 | 2015-04-29 | 无锡市中兴光电子技术有限公司 | Optical transceiver module with digital adjustable SBS suppression function |
| CN205566315U (en) * | 2016-02-23 | 2016-09-07 | 珠海柏卫宽带电子有限公司 | Optical sender of mouth is intercutted in area |
-
2017
- 2017-11-27 CN CN201711209569.9A patent/CN109842447A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020081069A1 (en) * | 2000-11-07 | 2002-06-27 | Photon-X, Inc. | Optical fiber transmission systems with suppressed light scattering |
| CN1826739A (en) * | 2003-06-09 | 2006-08-30 | 康宁股份有限公司 | Optical communication system with suppressed sbs |
| CN202535364U (en) * | 2012-01-21 | 2012-11-14 | 北京太平洋莱特科技有限公司 | 1500 nm direct modulation optical transmitter |
| CN104579493A (en) * | 2015-01-14 | 2015-04-29 | 无锡市中兴光电子技术有限公司 | Optical transceiver module with digital adjustable SBS suppression function |
| CN205566315U (en) * | 2016-02-23 | 2016-09-07 | 珠海柏卫宽带电子有限公司 | Optical sender of mouth is intercutted in area |
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Application publication date: 20190604 |