CN106506092B - A kind of low noise radio-frequency light transmission module of wide temperature range work - Google Patents
A kind of low noise radio-frequency light transmission module of wide temperature range work Download PDFInfo
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- CN106506092B CN106506092B CN201611202473.5A CN201611202473A CN106506092B CN 106506092 B CN106506092 B CN 106506092B CN 201611202473 A CN201611202473 A CN 201611202473A CN 106506092 B CN106506092 B CN 106506092B
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- fiber coupler
- optical power
- postposition
- preposition
- temperature
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
-
- 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
- H04B10/50—Transmitters
- H04B10/564—Power control
Abstract
The present invention relates to a kind of low noise radio-frequency light transmission modules of wide temperature range work, it by laser, preposition fiber coupler, postposition fiber coupler, Mach zehnder modulators, temperature control modules, forms without pilot power bias control module, wherein temperature control modules are made of TEC and analog pid circuit.No pilot power bias control module obtains the ratio that Mach zehnder modulators output and input optical power by photodetector, and as control error signal, it can exclude the influence of laser itself optical power disturbance, and steady-state error elimination is carried out by integral control loop, a regulation voltage is added on optical power ratio threshold voltage using add circuit, change regulation voltage, it can be achieved that electrooptic modulator any operating point on a large scale stabilization.The present invention realizes by introducing temperature control modules and carries out temperature-compensating to fiber coupler, reduce the variation of the coupling arm optical power as caused by temperature, improve the performance of radio frequency optical modulation.
Description
Technical field
The present invention relates to a kind of low noise radio-frequency light transmission modules of wide temperature range work, suitable for penetrating under wide warm working environment
Frequency laser transmission, belongs to fiber optic communication field.
Background technique
External modulation radio frequency optical transport technology has low-loss, the advantages that light weight, low-power consumption, electromagnetism interference, radar,
It suffers from and is widely applied in the fields such as satellite communication, measurement and detection system.
Radio-frequency light transmission module generally comprises laser, Mach zehnder modulators, fiber coupler, bias control module.
Radio-frequency light transmission module control program is usually to add low frequency perturbation signal, benefit at Mach zehnder modulators DC voltage bias end
With the feature of fundametal compoment minimum at modulation function linear zone second harmonic component minimum and extreme value, Mach once moral tune is automatically controlled
Device bias point processed.It is actually stable operating point although perturbation signal, the dither signal amplitude needed at linear zone is usual
It is 10 times or so of extreme point desired signal amplitude, therefore introduces larger noise, the transmission to radio frequency optical transport (ROF) system
Signal has some impact on.Also there is the bias voltage control scheme using power detection, due to not needing load disturbing signal, improving
There is greater advantage on signal quality, but due to the influence of laser own power fluctuation, lead to a monitoring modulator output light
The scheme stability of power is not high, and environment temperature influences whether optical path loss, and working at the same time a position and optical path loss has
It closes, it is not high so as to cause positioning accuracy.
The present invention by comprehensive study Mach zehnder modulators transmission curve characteristic, analyse in depth influence operating point because
Element proposes the bias voltage control scheme that a kind of positioning accuracy is high, noiseproof feature is good, bias voltage control of this programme based on power monitoring
Scheme outputs and inputs the ratio of optical power using modulator rather than uses single Output optical power as judgment basis, from
Inhibited in principle due to laser power it is unstable caused by working point control error, this radio-frequency light transmission module includes laser
Device, preposition fiber coupler, postposition fiber coupler, Mach zehnder modulators, temperature control modules, without pilot power bias control
Molding block.A certain proportion of laser before and after Mach zehnder modulators is transferred to nothing respectively and led by preposition and postposition fiber coupler
Frequency power bias control module, no pilot power bias control module is by adjusting the bias voltage of Mach zehnder modulators come steady
The ratio of fixed front and back optical power, temperature control modules are used to control the temperature of preposition fiber coupler and postposition fiber coupler.
This programme overcomes the influence of light source power itself disturbance, also inhibits the work point drift of modulator caused by coupler temperature change
It moves, improves the ambient adaptability of radio-frequency light transmission module, environmental suitability and the noise for improving radio frequency optical transmission chain are special
Property.
Summary of the invention
The purpose of the present invention is: the low noise for breaking through radio-frequency light transmission module operating point under high and low temperature environment accurately controls skill
Art realizes the RF laser modulation under wide warm working environment.
The technical solution of the invention is as follows: a kind of low noise radio-frequency light transmission module of wide temperature range work, including laser
Device, preposition fiber coupler, postposition fiber coupler, Mach zehnder modulators, temperature control modules, without pilot power bias control
Molding block, wherein light source of the laser as whole system, preposition fiber coupler and postposition fiber coupler are respectively by Mach
A certain proportion of light before and after zehnder modulators separates no pilot power bias control module, no pilot power bias voltage control mould
Block stablizes the ratio of front and back optical power by adjusting the bias voltage of Mach zehnder modulators, using appointing based on add circuit
Working point control scheme of anticipating adds a tune using add circuit before integral control loop on optical power ratio threshold voltage
Voltage is controlled, regulates and controls voltage by changing, realizes the stabilization of electrooptic modulator any operating point on a large scale, temperature control modules use
Analog pid temperature-control circuit, it is anti-as temperature using thermistor using the TEC of strip as heating and cooling module
Element is presented, temperature control is carried out to preposition fiber coupler and postposition fiber coupler, coupling caused by reducing because of temperature change
The variation of optical power on arm is closed, while fiber coupler, TEC and thermistor are sealed using foamed plastics shell, is subtracted
The circulation of few heat.
Described includes preposition photodetector, postposition photodetector, division electricity without pilot power bias control module
Road and integral control loop, no pilot power bias control module output and input the ratio of optical power with Mach zehnder modulators
For error signal, and the elimination of steady-state error is carried out by integral control loop, meanwhile, using any work based on add circuit
Make point control program, it can be achieved that electrooptic modulator any operating point on a large scale stabilization.
The ratio that the Mach zehnder modulators output and input optical power is by preposition photodetector and postposition
Photodetector acquires the optical power on preposition fiber coupler coupling arm and postposition fiber coupler coupling arm respectively, recycles
Division circuit obtains the ratio of two-way optical power, and division circuit is designed using analog divider, if preposition photodetector
The optical power value obtained with postposition photodetector is respectively P1And P2, and the operation function that divider is arranged isIts
Middle k is proportionality coefficient, works as P1< P2When, error amount works as P less than 01> P2When, error amount is greater than 0, works as P1=P2When, error amount is
0, error amount is sent to integral control loop and carries out error concealment.
The beneficial effects of the present invention are: present invention employs the ratio works that Mach zehnder modulators output and input optical power
For error signal, the influence of light source power itself disturbance is overcome；Using the power bias control module of no pilot tone, avoids and lead
The interference of frequency signal bring；Temperature control is carried out to fiber coupler using temperature control modules, improves microwave light subchain
The environmental suitability and noise characteristic on road；Fiber coupler, TEC and thermistor are carried out using foamed plastics shell close
Envelope, reduces the circulation of heat, slows down the actual temperature change of fiber coupler, and the work for reducing temperature control modules is negative
It carries；Complete machine can the stable operation in subzero 55 DEG C to 100 DEG C of environment above freezing.
Detailed description of the invention
Fig. 1 is collectivity Scheme Design block diagram
Fig. 2 is no pilot power bias control module design frame chart
Fig. 3 is the scheme that foamed plastics shell is sealed fiber coupler, TEC and thermistor
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
As shown in Figure 1, the low noise radio-frequency light transmission module that wide temperature range of the invention works includes laser 1, preposition light
Fine coupler 2, postposition fiber coupler 3, Mach zehnder modulators 4, temperature control modules 5, without pilot power bias voltage control mould
Block 6, the input terminal of Mach zehnder modulators 4 passes through the straight-through arm of preposition fiber coupler 2 respectively and radio frequency SMA wire is connected to light
Source and radiofrequency signal, the coupling arm of preposition fiber coupler 2 are connected to no pilot power bias control module 6 and visit for preposition photoelectricity
It surveys device 7 and acquires optical signal, the output end of Mach zehnder modulators 4 is connected with the input terminal of postposition fiber coupler 3, postposition light
Fine coupler 3 leads directly to arm for output end of the output optical signal as the Transmission system, the coupling arm of postposition fiber coupler 3 with
No pilot power bias control module 6 is connected, and postposition photodetector 8 is allowed to acquire its optical signal.
As shown in Fig. 2, firstly, setting 1 power of laser as Pin1, laser is through 1: α1The preposition fiber coupler 2 of splitting ratio
Insertion loss is β1, the output end that wherein ratio is 1 is β by insertion loss3FC interface after by no pilot power bias voltage control
The preposition photodetector 7 (PD2) of module 6 acquires, the reference value as 1 power of laser；Ratio is α1Output end pass through
FC interface enters Mach zehnder modulators 4, if insertion loss and the loss of 4 attenuated inside of Mach zehnder modulators are β2, and set horse
(Peak point) Output optical power is P when conspicuous 4 standard-sized sheet of zehnder modulatorsin2；If being exported after 4 stabilization of operating point of Mach zehnder modulators
Optical power is Pout1, the ratio of Output optical power is η when accounting for Mach 4 standard-sized sheet of zehnder modulators；Output optical power is through 1: α2Splitting ratio
Postposition fiber coupler 3 insertion loss be β4, the output end that ratio is 1 is β by insertion loss6FC interface after it is rear
Set photodetector 8 (PD1) acquisition.Using PD1 and the collected current ratio of PD2 as control error signal, laser can be excluded
Influence of the variation of the power of device 1 to error signal itself.When PD1 is equal with PD2 electric current, error signal 0 controls back at this time
Road reaches stable state, has:
The ratio η of power when Output optical power accounts for modulator standard-sized sheet after control loop is stablized can be obtained are as follows:
By formula (2) as it can be seen that the operating point of optical power ratio scheme and front and back coupler splitting ratio, electrooptic modulator loss
It is related with the factors such as FC interface loss, and it is unrelated with the power of laser itself, therefore light source power variation can be inhibited to introduce
Error.
Specific implementation is as shown in Figure 1, complete the measurement of front and back optical power ratio, two photodetections using division circuit 9
Device converts current signal for the laser power of 4 front and back of Mach zehnder modulators respectively, then passes through division circuit 9 for current difference
Value is converted to voltage value output, in this, as error signal, then carries out error concealment, integral using integral control loop 10
Operational formula isAny working point control scheme 11 based on add circuit by before integral element,
A regulation voltage is added on optical power ratio threshold voltage using add circuit, regulates and controls voltage by changing, electric light can be realized
The stabilization of modulator any operating point on a large scale.
Using analog pid temperature-control circuit, feedback end accesses thermistor, and output end accesses the TEC of strip,
Temperature control is carried out to preposition fiber coupler 2 and postposition fiber coupler 3 by cooling fin on TEC, thermistor is placed on two
It is used to the temperature of two fiber couplers of real-time measurement between fiber coupler.Use foamed plastics shell as shown in Figure 3 simultaneously
12 pairs of fiber couplers, TEC and thermistor are sealed, and reduce the circulation of heat.
The low noise radio-frequency light transmission module of wide temperature range work of the present invention is using the optical power before and after Mach zehnder modulators 4
Ratio controls Mach zehnder modulators 4 as error signal, using no pilot power bias control module 6, and to light
Fine coupler carries out temperature control, and by verifying and complete machine joint-trial, the present invention improves determining for 4 just bias point of Mach zehnder modulators
Position precision, overcomes the influence of light source power itself disturbance, avoids the interference of pilot signal bring, improves radio frequency optical transport
The environmental suitability and noise characteristic of link, complete machine can the stable operations in subzero 55 DEG C to 100 DEG C of environment above freezing.
Claims (3)
1. a kind of low noise radio-frequency light transmission module of wide temperature range work, it is characterised in that: including laser (1), preposition optical fiber
Coupler (2), postposition fiber coupler (3), Mach zehnder modulators (4), temperature control modules (5), without pilot power bias
Control module (6), wherein light source of the laser (1) as whole system, preposition fiber coupler (2) and postposition fiber coupler
(3) a certain proportion of light before and after Mach zehnder modulators (4) is separated into no pilot power bias control module (6) respectively,
No pilot power bias control module (6) stablizes front and back optical power by adjusting the bias voltage of Mach zehnder modulators (4)
Ratio, using any working point control scheme (11) based on add circuit, before integral control loop (10), using adding
Method circuit adds a regulation voltage on optical power ratio threshold voltage, regulates and controls voltage by changing, realizes the big model of electrooptic modulator
The stabilization of any operating point is enclosed, temperature control modules (5) use analog pid temperature-control circuit, using the TEC conduct of strip
Heating and cooling module, using thermistor as temperature feedback element, to preposition fiber coupler (2) and postposition fiber coupling
Device (3) carries out temperature control, reduces the variation because of optical power on coupling arm caused by temperature change, while using foamed plastics
Shell (12) is sealed fiber coupler, TEC and thermistor, reduces the circulation of heat.
2. the low noise radio-frequency light transmission module of wide temperature range work according to claim 1, it is characterised in that: the nothing
Pilot power bias control module (6) include preposition photodetector (7), postposition photodetector (8), division circuit (9) and
Integral control loop (10), no pilot power bias control module (6) output and input optical power with Mach zehnder modulators
Ratio is error signal, and the elimination of steady-state error is carried out by integral control loop (10), meanwhile, using based on add circuit
Any working point control scheme (11), it can be achieved that electrooptic modulator any operating point on a large scale stabilization.
3. the low noise radio-frequency light transmission module of wide temperature range work according to claim 2, it is characterised in that: the horse
The ratio that conspicuous zehnder modulators output and input optical power is by preposition photodetector (7) and postposition photodetector (8)
The optical power on preposition fiber coupler (2) coupling arm and postposition fiber coupler (3) coupling arm is acquired respectively, recycles division
Circuit (9) obtains the ratio of two-way optical power, and division circuit (9) is designed using analog divider, if preposition photodetection
The optical power value that device (7) and postposition photodetector (8) obtain is respectively P1And P2, and the operation function that divider is arranged isWherein k is proportionality coefficient, works as P1< P2When, error amount works as P less than 01> P2When, error amount is greater than 0, works as P1=
P2When, error amount is sent to integral control loop (10) and carries out error concealment by error amount 0.
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| CN108768536B (en) * | 2018-05-02 | 2021-10-26 | 南京大学（苏州）高新技术研究院 | High-security space chaotic laser communication system |
| CN111638675A (en) * | 2020-06-28 | 2020-09-08 | 西安方元明科技股份有限公司 | Automatic bias control circuit for electro-optic modulator |
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| JP2003295138A (en) * | 2002-04-05 | 2003-10-15 | Toshiba Corp | Optical modulator controller and optical transmitter using the same, method of controlling optical modulator, and control program recording medium |
| JP2009163164A (en) * | 2008-01-10 | 2009-07-23 | Sony Corp | Mach-zehnder interference type light signal modulator and control method therefor, and transceiver |
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| CN106712854A (en) * | 2016-12-20 | 2017-05-24 | 武汉光迅科技股份有限公司 | Locking method and apparatus of random work points of MZI external modulator |
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| CN103281130B (en) * | 2013-05-31 | 2016-05-25 | 上海交通大学 | Based on single multiple frequence millimeter wave generating device that drives Mach zehnder modulators |
| CN103957058B (en) * | 2014-05-08 | 2016-08-17 | 中国科学院半导体研究所 | The device of triangle microwave signal is produced based on Dual Drive Mach zehnder modulators |
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- 2016-12-22 CN CN201611202473.5A patent/CN106506092B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003295138A (en) * | 2002-04-05 | 2003-10-15 | Toshiba Corp | Optical modulator controller and optical transmitter using the same, method of controlling optical modulator, and control program recording medium |
| JP2009163164A (en) * | 2008-01-10 | 2009-07-23 | Sony Corp | Mach-zehnder interference type light signal modulator and control method therefor, and transceiver |
| CN101807085A (en) * | 2010-03-12 | 2010-08-18 | 上海华魏光纤传感技术有限公司 | Device for controlling and driving biasing and method for controlling and driving light intensity modulator |
| CN105099569A (en) * | 2015-06-25 | 2015-11-25 | 北京邮电大学 | Bias control system and bias control method of Mach-Zehnder modulator |
| CN106712854A (en) * | 2016-12-20 | 2017-05-24 | 武汉光迅科技股份有限公司 | Locking method and apparatus of random work points of MZI external modulator |
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