CN106506092A - 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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- CN106506092A CN106506092A CN201611202473.5A CN201611202473A CN106506092A CN 106506092 A CN106506092 A CN 106506092A CN 201611202473 A CN201611202473 A CN 201611202473A CN 106506092 A CN106506092 A CN 106506092A
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- fiber coupler
- rearmounted
- preposition
- temperature
- control
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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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to a kind of low noise radio-frequency light transmission module of wide temperature range work, by laser instrument, preposition fiber coupler, rearmounted fiber coupler, Mach zehnder modulators, temperature control modules, constitute without pilot power bias control module, wherein temperature control modules are made up of TEC and analog pid circuit.Without the ratio that pilot power bias control module obtains the input of Mach zehnder modulators and Output optical power by photodetector, and as control error signal, the impact of laser instrument itself luminous power disturbance can be excluded, and steady-state error elimination is carried out by integral control loop, a regulation and control voltage is added on optical power ratio threshold voltage using add circuit, change regulation and control voltage, stablize on a large scale by arbitrarily operating point for achievable electrooptic modulator.The present invention is realized carrying out fiber coupler temperature-compensating, reduces the change of the coupling arm luminous power caused by temperature, improve the performance of radio frequency optical modulation by introducing temperature control modules.
Description
Technical field
The present invention relates to a kind of low noise radio-frequency light transmission module of wide temperature range work, it is adaptable to penetrate under wide temperature working environment
Frequency laser is transmitted, and belongs to fiber optic communication field.
Background technology
The advantages of external modulation radio frequency optical transport technology has low-loss, light weight, low-power consumption, electromagnetism interference, radar,
Suffer from being widely applied in the fields such as satellite communication, measurement and detection system.
Radio-frequency light transmission module generally comprises laser instrument, Mach zehnder modulators, fiber coupler, bias control module.
Radio-frequency light transmission module control program is usually in the additional low frequency perturbation signal in Mach zehnder modulators DC voltage bias end, profit
With modulation function linear zone second harmonic component is minimum and extreme value at fundametal compoment minimum the characteristics of, once moral is adjusted to automatically control Mach
Device bias point processed.Although perturbation signal, is actually stable operating point, the dither signal amplitude needed at linear zone is usual
It is 10 times of extreme point desired signal amplitude or so, therefore introduces larger noise, the transmission to radio frequency optical transport (ROF) system
Signal causes certain impact.Also there is the bias voltage control scheme using power detection, as disturbing signal need not be loaded, improving
There is on signal quality greater advantage, but the impact due to the fluctuation of laser instrument own power, cause a monitoring modulator output light
The scheme stability of power is not high, and environment temperature influences whether optical path loss, while operating point location is had with optical path loss
Close, so as to cause positioning precision not high.
The present invention by comprehensive study Mach zehnder modulators transmission curve characteristic, analyse in depth affect operating point because
Element, it is proposed that a kind of positioning precision is high, the bias voltage control scheme that noiseproof feature is good, bias voltage control of this programme based on power monitoring
Scheme, using modulator input and Output optical power ratio rather than using single Output optical power as basis for estimation, from
The working point control error caused as laser power is unstable, this radio-frequency light transmission module is inhibited to include laser in principle
Device, preposition fiber coupler, rearmounted fiber coupler, Mach zehnder modulators, temperature control modules, without pilot power bias control
Molding block.Preposition and rearmounted fiber coupler respectively by Mach zehnder modulators before and after a certain proportion of Laser Transmission to without leading
Frequency power bias control module, without pilot power bias control module by adjusting the bias voltage of Mach zehnder modulators come steady
The ratio of luminous power before and after fixed, temperature control modules are used for the temperature for controlling preposition fiber coupler and rearmounted fiber coupler.
This programme overcomes the impact of light source power itself disturbance, also inhibits the modulator work point drift that coupler temperature change causes
Move, improve the ambient adaptability of radio-frequency light transmission module, the environmental suitability and noise that improve radio frequency optical transmission chain is special
Property.
Content of the invention
The purpose of the present invention is：Break through the low noise precise control skill of radio-frequency light transmission module operating point under high and low temperature environment
Art, realizes the RF-laser modulation under wide temperature working environment.
The present invention technical solution be：A kind of low noise radio-frequency light transmission module of wide temperature range work, including laser
Device, preposition fiber coupler, rearmounted fiber coupler, Mach zehnder modulators, temperature control modules, without pilot power bias control
The light source of molding block, wherein laser instrument as whole system, preposition fiber coupler and rearmounted fiber coupler are respectively by Mach
A certain proportion of light before and after zehnder modulators is separated without pilot power bias control module, without pilot power bias voltage control mould
By adjusting the bias voltage of Mach zehnder modulators come the ratio of luminous power before and after stablizing, temperature control modules are used for controlling block
Preposition fiber coupler and the temperature of rearmounted fiber coupler.
Described includes preposition photodetector, rearmounted photodetector, division electricity without pilot power bias control module
Road and integral control loop, without pilot power bias control module with the input of Mach zehnder modulators and the ratio of Output optical power
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 a point control program, stablize on a large scale by arbitrarily operating point for achievable electrooptic modulator.
The ratio of described Mach zehnder modulators input and Output optical power is by preposition photodetector and rearmounted
Photodetector gathers the luminous power on preposition fiber coupler coupling arm and rearmounted fiber coupler coupling arm respectively, recycles
Division circuit obtains the ratio of two-way luminous power, and division circuit is designed using analog divider, if preposition photodetector
The optical power value obtained with rearmounted photodetector is respectively P1And P2, and the operation function of divider is set isIts
Middle k is proportionality coefficient, works as P1＜ P2When, error amount works as P less than 01＞ P2When, error amount works as P more than 01=P2When, error amount is
0, error amount is sent to integral control loop carries out error concealment.
Described is before integral control loop, using addition electricity based on any working point control scheme of add circuit
Road adds a regulation and control voltage on optical power ratio threshold voltage, by changing regulation and control voltage, you can realize the big model of electrooptic modulator
Enclose stablizing for any operating point.
Described temperature control modules adopt analog pid temperature-control circuit, and are made as heating using the TEC of strip
Cold element, using thermistor as temperature feedback element, enters trip temperature to preposition fiber coupler and rearmounted fiber coupler
Control, reduces the change of the luminous power on caused coupling arm because of temperature change.Simultaneously using foamed plastics shell to optical fiber coupling
Clutch, TEC and thermistor are sealed, and reduce the circulation of heat.
The invention has the beneficial effects as follows：The ratio that present invention employs Mach zehnder modulators input and Output optical power is made
For error signal, the impact of light source power itself disturbance is overcome；Using the power bias control module without pilot tone, it is to avoid lead
The interference that frequency signal brings；Employing temperature control modules carries out temperature control to fiber coupler, improves microwave light subchain
The environmental suitability on road and noise characteristic；Employ foamed plastics shell fiber coupler, TEC and thermistor are carried out close
Envelope, reduces the circulation of heat, slow down the actual temperature change of fiber coupler, and the work for reducing temperature control modules is born
Carry；Whole machine can stable operation in subzero 55 DEG C to 100 DEG C above freezing of environment.
Description of the drawings
Fig. 1 is collectivity Scheme Design block diagram
Fig. 2 is without pilot power bias control module design frame chart
Fig. 3 is the scheme sealed to fiber coupler, TEC and thermistor by foamed plastics shell
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is further described.
As shown in figure 1, the low noise radio-frequency light transmission module of the wide temperature range work of the present invention includes laser instrument 1, preposition light
Fine coupler 2, rearmounted fiber coupler 3, Mach zehnder modulators 4, temperature control modules 5, without pilot power bias voltage control mould
Block 6, the input of Mach zehnder modulators 4 are connected to light by the straight-through arm and radio frequency SMA wire of preposition fiber coupler 2 respectively
Source and radiofrequency signal, the coupling arm of preposition fiber coupler 2 are connected to and supply preposition smooth electrical resistivity survey without pilot power bias control module 6
The collection optical signal of device 7 is surveyed, the output end of Mach zehnder modulators 4 is connected with the input of rearmounted fiber coupler 3, rearmounted light
Fine coupler 3 leads directly to arm for exporting optical signal as the output end of the Transmission system, the coupling arm of rearmounted fiber coupler 3 with
It is connected without pilot power bias control module 6, allows rearmounted photodetector 8 to gather its optical signal.
As shown in Fig. 2 first, if 1 power of laser instrument is Pin1, laser is through 1: α1The preposition fiber coupler 2 of splitting ratio
Insertion loss is β1, wherein ratio be 1 output end through insertion loss be β3FC interfaces after by without pilot power bias voltage control
Preposition photodetector 7 (PD2) collection of module 6, used as the reference value of 1 power of laser instrument；Ratio is α1Output end pass through
FC interfaces enter Mach zehnder modulators 4, if insertion loss and the loss of 4 attenuated inside of Mach zehnder modulators are β2, and set horse
During conspicuous 4 standard-sized sheet of zehnder modulators, (Peak points) Output optical power is Pin2；If exporting after 4 stabilization of operating point of Mach zehnder modulators
Luminous power is Pout1, when accounting for Mach 4 standard-sized sheet of zehnder modulators, the ratio of Output optical power is η；Output optical power is through 1: α2Splitting ratio
Rearmounted fiber coupler 3 insertion loss be β4, ratio be 1 output end through insertion loss be β6FC interfaces after rear
Put photodetector 8 (PD1) collection.The current ratio that PD1 and PD2 is collected can exclude laser as control error signal
Impact of the change of device 1 power to error signal itself.When PD1 is equal with PD2 electric currents, error signal is 0, now controls back
Road reaches stable state, has：
When after control loop can be obtained stably, Output optical power accounts for modulator standard-sized sheet, ratio η of power is：
From formula (2), the operating point of luminous power ratio scheme and in front and back coupler splitting ratio, electrooptic modulator loss
Relevant with factors such as FC interface loss, and unrelated with the power of laser instrument itself, light source power change therefore can be suppressed to introduce
Error.
Implement as shown in figure 1, complete the measurement of before and after's luminous power ratio using division circuit 9, two photodetections
Laser power before and after Mach zehnder modulators 4 is converted into current signal by device respectively, then passes through division circuit 9 by difference between current
Value is converted to magnitude of voltage output, in this, as error signal, then carries out error concealment using integral control loop 10, and which integrates
Operational formula isAny working point control scheme 11 based on add circuit passed through before integral element,
A regulation and control voltage is added on optical power ratio threshold voltage using add circuit, by changing regulation and control voltage, you can realize electric light
Stablize on a large scale by arbitrarily operating point for modulator.
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 rearmounted fiber coupler 3 by fin on TEC, thermistor is placed on two
It is used for the temperature for measuring two fiber couplers in real time between fiber coupler.Foamed plastics shell is adopted simultaneously as shown in Figure 3
12 pairs of fiber couplers, TEC and thermistors 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 luminous power before and after Mach zehnder modulators 4
Ratio is controlled to Mach zehnder modulators 4 as error signal, is adopted without pilot power bias control module 6, and to light
Fine coupler carries out temperature control, and by checking and whole machine joint-trial, the present invention improves determining for 4 just bias point of Mach zehnder modulators
Position precision, overcomes the impact of light source power itself disturbance, it is to avoid the interference that pilot signal is brought, and improves radio frequency optical transport
The environmental suitability of link and noise characteristic, whole machine can stable operations in subzero 55 DEG C to 100 DEG C above freezing of environment.
Claims (5)
1. the low noise radio-frequency light transmission module that a kind of wide temperature range works, it is characterised in that：Including laser instrument (1), preposition optical fiber
Coupler (2), rearmounted fiber coupler (3), Mach zehnder modulators (4), temperature control modules (5), without pilot power bias
Control module (6), wherein light source of the laser instrument (1) as whole system, preposition fiber coupler (2) and rearmounted fiber coupler
(3) respectively a certain proportion of light before and after Mach zehnder modulators (4) is separated without pilot power bias control module (6),
Without pilot power bias control module (6) by adjusting the bias voltage of Mach zehnder modulators (3) come luminous power before and after stablizing
Ratio, temperature control modules (5) are used for controlling the temperature of preposition fiber coupler (2) and rearmounted fiber coupler (3).
2. the low noise radio-frequency light transmission module that wide temperature range according to claim 1 works, it is characterised in that：Described nothing
Pilot power bias control module (6) include preposition photodetector (7), rearmounted photodetector (8), division circuit (9) and
Integral control loop (10), without pilot power bias control module (6) with the input of Mach zehnder modulators and Output optical power
Ratio is error signal, and carries out the elimination of steady-state error by integral control loop (10), meanwhile, using based on add circuit
Any working point control scheme (11), stablize on a large scale by arbitrarily operating point for achievable electrooptic modulator.
3. the low noise radio-frequency light transmission module that wide temperature range according to claim 2 works, it is characterised in that：Described horse
The ratio of conspicuous zehnder modulators input and Output optical power is by preposition photodetector (7) and rearmounted photodetector (8)
Gather the luminous power on preposition fiber coupler (2) coupling arm and rearmounted fiber coupler (3) coupling arm respectively, recycle division
Circuit (9) obtains the ratio of two-way luminous power, and division circuit (9) is designed using analog divider, if preposition photodetection
The optical power value that device (7) and rearmounted photodetector (8) are obtained is respectively P1And P2, and the operation function of divider is set isWherein k is proportionality coefficient, works as P1＜ P2When, error amount works as P less than 01＞ P2When, error amount works as P more than 01=P2
When, error amount is 0, and error amount is sent to integral control loop (10) carries out error concealment.
4. the low noise radio-frequency light transmission module that wide temperature range according to claim 2 works, it is characterised in that：Described base
It is before integral control loop (10), using add circuit in light work(in any working point control scheme (11) of add circuit
Rate regulates and controls voltage than adding a regulation and control voltage on threshold voltage by changing, you can realize electrooptic modulator any work on a large scale
Make stablizing for point.
5. the low noise radio-frequency light transmission module that wide temperature range according to claim 1 works, it is characterised in that：Described temperature
Degree control module (5) adopt analog pid temperature-control circuit, using strip TEC as heating and cooling module, using heat
Quick resistance carries out temperature control as temperature feedback element to preposition fiber coupler (2) and rearmounted fiber coupler (3), drop
The change of luminous power on low coupling arm caused because of temperature change, while using foamed plastics shell (12) to fiber coupling
Device, TEC and thermistor are sealed, and reduce the circulation of heat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611202473.5A CN106506092B (en) | 2016-12-22 | 2016-12-22 | A kind of low noise radio-frequency light transmission module of wide temperature range work |
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| CN201611202473.5A CN106506092B (en) | 2016-12-22 | 2016-12-22 | A kind of low noise radio-frequency light transmission module of wide temperature range work |
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Cited By (3)
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| CN108768536A (en) * | 2018-05-02 | 2018-11-06 | 南京大学（苏州）高新技术研究院 | A kind of high secrecy spatial chaos 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 |
| CN115882955A (en) * | 2022-12-09 | 2023-03-31 | 中国电子科技集团公司第三十八研究所 | Low-stray light modulator bias control device and method |
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| CN103957058A (en) * | 2014-05-08 | 2014-07-30 | 中国科学院半导体研究所 | Device for generating triangular microwave signals based on dual drive Mach-Zehnder modulator |
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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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| CN115882955A (en) * | 2022-12-09 | 2023-03-31 | 中国电子科技集团公司第三十八研究所 | Low-stray light modulator bias control device and method |
| CN115882955B (en) * | 2022-12-09 | 2024-05-10 | 中国电子科技集团公司第三十八研究所 | Low-spurious light modulator bias control device and method |
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