CN108418641A - A kind of multi-channel optical receiving unit of integrated light amplifier - Google Patents
A kind of multi-channel optical receiving unit of integrated light amplifier Download PDFInfo
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- CN108418641A CN108418641A CN201810253679.3A CN201810253679A CN108418641A CN 108418641 A CN108418641 A CN 108418641A CN 201810253679 A CN201810253679 A CN 201810253679A CN 108418641 A CN108418641 A CN 108418641A
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/672—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal
- H04B10/673—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal using an optical preamplifier
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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Abstract
It the present invention relates to the use of a kind of multi-channel optical receiving unit of integrated light amplifier in the device of stimulated emission, it includes semiconductor optical amplification device, optical connecting device and multi-channel optical reception device, optical signal passes through semiconductor optical amplification device successively and optical connecting device enters multi-channel optical reception device, optical connecting device includes spherical connecting pin and concave ball shape connecting pin, and the protruding end of spherical connecting pin and the groove ends of concave ball shape connecting pin end face coordinate.Substantial effect of the invention is：Devise a kind of multi-channel optical receiving unit using SOA and a kind of parallel optical connecting device for being collimatedly incident on multi-channel optical reception device of the outgoing beam of SOA that enables, and utilize the feedback control of SOA end monitoring modules or the ends Odemux monitoring module, make the optical signal of amplification within detection threshold, to reduce the bit error rate of electric signal output result.
Description
Technical field
It the present invention relates to the use of the device of stimulated emission more particularly to a kind of multi-channel optical reception group of integrated light amplifier
Part.
Background technology
Semiconductor optical amplifier（Semiconductor optical amplifier, abbreviation SOA）In optical fiber telecommunications system
In have a wide range of applications, can not only do the power amplifier of light transmitting terminal, the relay amplifier of circuit, optical receiving end it is preposition
Amplifier and optical branching compensate amplifier, and are also used as nonlinear device for the light such as photoswitch and wavelength shifter letter
Number processing module.
Preamplifier of the semiconductor optical amplifier as optical receiving end can carry out the signal light for entering optical receiving end
Light amplification, with transmission loss of the thermal compensation signal light in long-distance light path, this light amplification process improves the signal work(of optical receiving end
Rate and signal-to-noise ratio finally improve the detectivity of optical receiving end.A kind of light proposed such as patent CN200880131443.7
Amplification control device, semiconductor optical amplifier control method and optical transmission equipment, receiving terminal part are put before optical receiver
Semiconductor optical amplification control device is set, the signal light to entering optical receiver carries out light amplification, and is controlled in semiconductor optical amplification
Optical filter is placed between device and optical receiver, filters out the spontaneous emission noise of semiconductor optical amplification control device；Patent
A kind of optic module that CN200680044522.5 is proposed, a part of the semiconductor optical amplifier as its internal receipt end, first
Signal light to entering optic module carries out light amplification, other receiving devices being transmitted further in optic module.
Compared to other kinds of optical amplifier, such as erbium-doped fiber amplifier, optical fiber Raman amplifier, semiconductor light is put
Big utensil have the advantages that it is small, simple in structure, at low cost, be not required to pumping source, be easy to integrated with other optical devices and circuit, because
This takes advantage in the integrated application of optical communication system receiving terminal.
But above-mentioned two patent is all to apply semiconductor optical amplifier in single-channel optical communication system receiving terminal, half
Application of the conductor image intensifer in multi channel optical communication system receiving terminal is but rarely reported；And semiconductor optical amplifier is more
There is a problem of that noise is big in channel amplification, corresponding noise-removed technology is also rarely reported；In patent CN200880131443.7,
The connection type of semiconductor optical amplifier and optical receiver is optical fiber, and the minimum bending radius of optical fiber limits the ruler of optical receiving end
It is very little, so that design is unsatisfactory for the demand of miniaturization optic communication device.
In order to reduce the reflection feedback in semiconductor optical amplifier, in the manufacture craft of semiconductor optical amplifier chip,
Strip active area would generally be made to deviate the certain angle, θ of cleaved facets normal, as shown in Figure 1, this is caused from semiconductor amplifier
Its transmission direction of the light beam of outgoing also has certain angle, θ relative to cleaved facets normal, i.e. outgoing beam direction deviates from
The central axis direction of semiconductor optical amplifier.In the application of multi-channel optical receiving unit, special connection structure or light are needed
Device enables being incident in next optical device of light-receiving component of the parallel collimation of the outgoing beam of semiconductor optical amplifier.
Invention content
The technical problem to be solved by the present invention is to solve the problems, such as following three：1, using SOA to multi-channel optical communication system
The optical signal of optical receiving end is amplified in system；2, design it is a kind of enable the outgoing beam of SOA it is parallel be collimatedly incident on it is more
The optical connecting device of channel optical receiver apparatus；3, SOA is eliminated to the design multi-channel optical reception group by adding narrow band filter
The influence of part；4, gain effect is controlled to reduce the mistake of electric signal output result by the bias current of real-time monitoring SOA
Code check.
Used technical solution is the present invention in order to solve the above problem：A kind of multi-channel optical reception of integrated light amplifier
Component includes semiconductor optical amplification device, optical connecting device and multi-channel optical reception device, and optical signal passes through the semiconductor light
The input terminal of amplifying device enters, and the semiconductor optical amplification device passes through the light connects with the multi-channel optical reception device
Device connects, and optical signal connects by the semiconductor optical amplification device and the optical connecting device into the multi-channel optical successively
Receiving apparatus becomes electric signal by opto-electronic conversion and is exported from multi-channel optical reception device, and the optical connecting device includes spherical connects
End and concave ball shape connecting pin are connect, the spherical shape connecting pin is the cylinder that an end face is connected to semiconductor optical amplification device output end
Shape connecting pin, another end face of the connecting pin are equipped with protrusion, and the longitudinal section of the outer rim of the protrusion is the circle that radius of curvature is R
Arc, the cross section at raised center are the circular hole of a diameter of D；The concave ball shape connecting pin is that an end face is connected to multi-channel optical
The cylindrical connecting pin of reception device input terminal coordinates with spherical connecting pin, another end face of the connecting pin is equipped with groove, should
The peripheral side wall of groove is the circular arc that longitudinal section radius of curvature is R, and the bottom centre cross section of groove is the circular hole of a diameter of D；
The spherical shape connecting pin and concave ball shape connecting pin pass through laser welding.Optical signal passes through semiconductor optical amplification device successively and light connects
Connection device enters multi-channel optical reception device, becomes electric signal from multichannel by opto-electronic conversion in multi-channel optical reception device
Optical receiver apparatus exports, and realizes and the optical signal of optical receiving end in multi-channel optical communication system is amplified and is obtained using SOA
Take the electric signal of each channel.SOA chip fabrication techniques can make strip active area deviate the certain angle, θ of cleaved facets normal,
This causes its transmission direction of light beam being emitted from SOA also to have certain angle, θ, i.e. outgoing beam relative to cleaved facets normal
Direction deviates from the central axis direction of SOA outgoing end face, makes SOA's by the rotation of spherical connecting pin and concave ball shape connecting pin
Outgoing beam is parallel to be collimatedly incident on multi-channel optical reception device.
Preferably, the semiconductor optical amplification device include several light paths, it is beam splitter, preposition optoisolator, preposition
Coupled lens, semiconductor optical amplifier, the ends SOA monitoring module, postposition coupled lens and postposition optoisolator, several light paths
It is optical signal input light path including light path L1, light path L2 and light path L3, the light path L1, the optical signal into light path L1 passes through after
Light path L2 and light path L3 are respectively enterd after crossing beam splitter, the optical signal into light path L2 passes through preposition optoisolator, preceding successively
Coupled lens, semiconductor optical amplifier, postposition coupled lens and postposition optoisolator are set, the optical signal into light path L3 enters
The ends SOA monitoring module, the ends SOA monitoring module are electrically connected with the semiconductor optical amplifier.SOA is in preposition optoisolator
Between postposition optoisolator, two isolator common guarantees one-way transmission of the optical signal in SOA.Optical signal passes through preposition
Coupled lens enter SOA, and are returned in light path by postposition coupled lens.
Preferably, the ends SOA monitoring module is used to control semiconductor light according to the light signal strength for entering light path L3
The bias current of amplifier, including photodetector, microprocessor and memory, the photodetector and the memory are equal
It is electrically connected with microprocessor, the microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier, the light
Electric explorer is used to obtain the light signal strength in light path L3, and the microprocessor is used to calculate the light signal strength in light path L2
And control the bias current of semiconductor optical amplifier.It is calculated by the ratio of light signal strength and beam splitter light splitting in L3
Go out the light signal strength in L2, then the data by being stored in memory calculate the size of bias current and control semiconductor light
The bias current of amplifier.
Preferably, it is 90 that the beam splitter, which is splitting ratio,:10 beam splitter.Selection is divided bigger beam splitting
Device so that stronger optical signal enters light path L2.
Preferably, the multi-channel optical reception device includes several light paths, optical demultiplexer, narrow band filter group, light
Electric detecting module group and the ends Odemux monitoring module, optical signal enter the Optical Demultiplexing from concave ball shape connecting pin by light path
Device separates n item light branches behind the optical demultiplexer, and every light branch end is respectively via corresponding narrow band filter and phase
The photoelectric detection module answered is attached, and n photoelectric detection module constitutes photoelectric detection module group, the photoelectric detection module group
End be electrically connected with the ends Odemux monitoring module, the ends Odemux monitoring module is electrically connected with semiconductor optical amplifier
It connects.
Preferably, the band that the narrow band filter group corresponds respectively to n item light branch optical signal centre wavelengths by n
Bandpass filter is constituted.
Preferably, the photoelectric detection module is made of photodetector and preposition electric signal amplifier, it is respectively used to
The effects that opto-electronic conversion and electric signal amplify.
Preferably, the electric signal control half that the ends Odemux monitoring module is used to be exported according to photoelectric detection module group
The bias current of conductor image intensifer, including electric signal detector, microprocessor and memory, the electric signal detector and are deposited
Reservoir is electrically connected with microprocessor, and the microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier,
The electric signal detector is used to obtain the voltage value of n photoelectric detection module output, and the microprocessor is used for according to above-mentioned
Voltage value controls the bias current of semiconductor optical amplifier.Pass through the feedback of the ends SOA monitoring module or the ends Odemux monitoring module
Effect so that the optical signal that photodetector in the photoelectric detection module of multi-channel optical reception device obtains detection threshold it
It is interior, to reduce the bit error rate of electric signal output result.
Substantial effect of the invention is：Devise a kind of multi-channel optical receiving unit using SOA and a kind of so that SOA
Outgoing beam can the parallel optical connecting device for being collimatedly incident on multi-channel optical reception device, and utilize the ends SOA monitoring module
Or the feedback control of the ends Odemux monitoring module so that the optical signal of amplification is defeated to reduce electric signal within detection threshold
Go out the bit error rate of result.
Description of the drawings
Fig. 1 is the structural schematic diagram of the multi-channel optical receiving unit of the integrated light amplifier.
Fig. 2 is the CONSTRUCTED SPECIFICATION schematic diagram of optical connecting device, wherein Fig. 2（a）For the exploded perspective view of optical connecting device,
Fig. 2（b）For the non-deflected state schematic diagram of optical connecting device, wherein Fig. 2（c）For the deflection state schematic diagram of optical connecting device.
Fig. 3 is the connection diagram of optical connecting device, wherein Fig. 3（a）Show for the non-deflected state connection of optical connecting device
It is intended to, Fig. 3（b）For the deflection state connection diagram of optical connecting device.
In figure：100, semiconductor optical amplification device, 101, beam splitter, 102, preposition optoisolator, 103, preposition coupling
Lens, 104, semiconductor optical amplifier, 105, the ends SOA monitoring module, 106, postposition coupled lens, 107, postposition optoisolator,
200, multi-channel optical reception device, 201, optical demultiplexer, 202, narrow band filter group, 203, photoelectric detection module group, 204,
The ends Odemux monitoring module, 300, optical connecting device, 301, spherical connecting pin, 302 concave ball shape connecting pins.
Specific implementation mode
Below by specific embodiment, and in conjunction with attached drawing, the specific implementation mode of the present invention is further described in detail.
Fig. 1 is the structural schematic diagram of the multi-channel optical receiving unit of the integrated light amplifier, including semiconductor optical amplification dress
Set 100, optical connecting device 300 and multi-channel optical reception device 200, the input that optical signal passes through semiconductor optical amplification device 100
End enters, and semiconductor optical amplification device 100 connect with multi-channel optical reception device 200 by optical connecting device 300, optical signal according to
It is secondary to enter multi-channel optical reception device 200 by semiconductor optical amplification device 100 and optical connecting device 300, by opto-electronic conversion
Become electric signal to export from multi-channel optical reception device 200.Semiconductor optical amplification device 100 includes several light paths, beam splitter
101, preposition optoisolator 102, preposition coupled lens 103, semiconductor optical amplifier 104, the ends SOA monitoring module 105, postposition coupling
Lens 106 and postposition optoisolator 107 are closed, several light paths include light path L1, light path L2 and light path L3, and light path L1 is that optical signal is defeated
Enter light path, into light path L1 optical signal then pass through beam splitter 101 after respectively enter light path L2 and light path L3, into light path
The optical signal of L2 is successively by preposition optoisolator 102, preposition coupled lens 103, semiconductor optical amplifier 104, postposition coupling
Lens 106 and postposition optoisolator 107, the optical signal into light path L3 enter the ends SOA monitoring module 105, the ends SOA monitoring module
105 are electrically connected with semiconductor optical amplifier 104.Multi-channel optical reception device 200 includes several light paths, optical demultiplexer 201, narrow
Band filter group 202, photoelectric detection module group 203 and the ends Odemux monitoring module 204, optical signal is from concave ball shape connecting pin 302
Enter optical demultiplexer 201 by light path, n item light branches is separated behind optical multiplexer, every light branch end is respectively via phase
The narrow band filter answered is attached with corresponding photoelectric detection module, and n photoelectric detection module constitutes photoelectric detection module group
203, the end of photoelectric detection module group 203 is electrically connected with the ends Odemux monitoring module 204, the ends Odemux monitoring module 204 with
Semiconductor optical amplifier 104 is electrically connected.
Fig. 2 is the CONSTRUCTED SPECIFICATION schematic diagram of optical connecting device, Fig. 2（a）For the exploded perspective view of optical connecting device, Fig. 2（b）
For the non-deflected state schematic diagram of optical connecting device, Fig. 2（c）For the deflection state schematic diagram of optical connecting device；Fig. 3 is light connects
The connection diagram of device, wherein Fig. 3（a）For the non-deflected state connection diagram of optical connecting device, Fig. 3（b）For light connects
The deflection state connection diagram of device.Optical connecting device includes spherical connecting pin 301 and concave ball shape connecting pin 302；Spherical shape is even
Connect the cylindrical connecting pin that end 301 is connected to 100 output end of semiconductor optical amplification device for an end face, the connecting pin other one
A end face is equipped with protrusion, and the longitudinal section of the outer rim of the protrusion is the circular arc that radius of curvature is R, and the cross section at raised center is straight
Diameter is the circular hole of D；Concave ball shape connecting pin 302 is the cylinder that an end face is connected to 200 input terminal of multi-channel optical reception device
Connecting pin coordinates with spherical connecting pin 301, another end face of the connecting pin is equipped with groove, and the peripheral side wall of the groove is vertical
Sectional curvature radius is the circular arc of R, and the bottom centre cross section of groove is the circular hole of a diameter of D；The spherical shape connecting pin and recessed
Spherical connecting pin passes through laser welding.The opposing end surface of the spherical connecting pin 301 and concave ball shape connecting pin 302 of optical connector apparatus
Spherical radius R having the same, it is all the circular hole of D that, which there is the diameter of perforation at the two center, and the length of optical connecting device 300 meets
The light being emitted from semiconductor optical amplification device 100 remains to pass through when drift angle is θ between 300 central axis of optical connecting device.
Fig. 2（b）For with Fig. 3（a）The corresponding Section A-A figure of spherical port connection structure in middle dotted line frame, when spherical connecting pin 301 and recessed ball
When drift angle of the central axis of shape connecting pin 302 in perpendicular is θ, the outgoing beam of SOA parallel can be collimatedly incident on
Multi-channel optical reception device 200, such as Fig. 2（c）And Fig. 3（b）It is shown.
A kind of multi-channel optical receiving unit of integrated light amplifier of the present invention, multichannel represent 2 channels or more
Any number of channel, such as 2 channels, 4 channels, 32 channels, corresponding optical demultiplexer 201 have the output end of corresponding number
Mouthful, there is narrow band filter group 202 narrow band filter of corresponding number, photoelectric detection module group 203 to have the light of corresponding number
Electric detecting module.By taking 4 channel light receiving units as an example, the present embodiment is described and is illustrated.It is incident on input path L1
Light is four kinds of wavelength（λ1、λ2、λ3、λ4）The mixed light beam of optical signal, this mixed light beam 4 channel light receiving units of incidence, first
It is received by semiconductor optical amplification device 100.Incident light is divided into two-way by beam splitter 101 by splitting ratio size（L2 and L3）, more
Number light signal energy enters light path L2, subsequently enters the optically amplified link of the semiconductor optical amplification device 100 on rear side of optoisolator；
A small number of light signal energies enter light path L3, subsequently enter the later semiconductor optical amplification device 100 of the ends SOA monitoring module 105
Feedback control link.The specific splitting ratio of beam splitter 101 is set according to concrete condition, as the splitting ratio of two light path of L2 and L3 is
90:10.The optical signal of light path L2 enters preposition optoisolator 102, and the effect of preposition optoisolator 102 is to block light behind
Road and the reflected light of optical device, to block shadow of these reflected lights to the optical device before preposition optoisolator 102
It rings.The optical signal being emitted from preposition optoisolator 102 is guided by preposition coupled lens 103 to semiconductor optical amplifier 104.Partly lead
Body image intensifer 104 carries out light amplification to four kinds of incident wavelength channels.Mixing optical signal through light amplification is from semiconductor light
Amplifier 104 exports, and is then guided to postposition optoisolator 107 by postposition coupled lens 106, mixing optical signal passes through optically isolated
Device subsequently enters the spherical connecting pin 301 in optical connector apparatus.The effect of postposition optoisolator 107 is to block light behind
The light that road and optical device are reflected back, to block influence of these reflected lights to the optical device before postposition optoisolator 107.
107 common guarantee of preposition optoisolator 102 and postposition optoisolator unidirectional biography of the optical signal in semiconductor optical amplifier 104
It is defeated.The optical signal of light path L3 enters the ends SOA monitoring module 105, and the effect of the ends SOA monitoring module 105 is according to input path
The light signal strength feedback control semiconductor optical amplifier 104 of L3 makes semiconductor optical amplifier 104 that there is constant light intensity to export
Value.
The ends SOA monitoring module 105 is used to control semiconductor optical amplifier 104 according to the light signal strength for entering light path L3
Bias current, including photodetector, microprocessor and memory, photodetector and memory are electrically connected with microprocessor
It connects, microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier 104, and photodetector is for obtaining light path
Light signal strength in L3, microprocessor is for calculating the light signal strength in light path L2 and controlling semiconductor optical amplifier 104
Bias current.Ratio by light signal strength and the light splitting of beam splitter 101 in L3 is strong to calculate the optical signal in L2
Degree, then the data by being stored in memory calculate the size of bias current and control the biasing of semiconductor optical amplifier 104
Electric current.Since the electric signal output result of photoelectric detection module group 203 need to meet less than a certain bit error rate, this causes each light
Electric detecting module 203a/203b/203c/203d has a certain minimum detection limit Pomin and certain to incident light signal strength
One maximum probe limit Pomax, this determines the mixed light signal strength values being emitted from semiconductor optical amplification device 100 simultaneously
Range, if ranging from Pmin ~ Pmax of the corresponding mixed light signal strength values being emitted from semiconductor optical amplifier 104.It supervises at the ends SOA
Control module 105 has prestored the value range of Pmin ~ Pmax in its memory, and sets a certain value within the scope of Pmin ~ Pmax
Pset is the plan output intensity of semiconductor optical amplifier 104.The inside photodetector detection of the ends SOA monitoring module 105 from
The mixed light signal strength values of light path L3 incidences, the microprocessor of the ends SOA monitoring module 105 is according to the light splitting of beam splitter 101
Than the mixed light signal strength values for extrapolating input path L2 with the mixed light signal strength values of light path L3 incidences, that is, calculates and come in and go out
Penetrate the mixed light signal strength values of semiconductor optical amplifier 104.The microprocessor of the ends SOA monitoring module 105 is further according to incident half
The mixed light signal strength values of conductor image intensifer 104 and preset plan output intensity Pset, extrapolate semiconductor light
Bias current value of the amplifier 104 to mixing optical signal due gain coefficient and corresponding semiconductor optical amplifier 104.SOA
The microprocessor of end monitoring module 105 adjusts the bias current for being applied to semiconductor optical amplifier 104 to above-mentioned respective value, to change
Become semiconductor optical amplifier 104 to the gain coefficient for mixing optical signal to above-mentioned calculated value, makes semiconductor optical amplifier 104 to mixed
The amplified output intensity of closing light signal is plan output intensity Pset.The ends SOA monitoring module 105 is realized to semiconductor optical amplification
The control of device 104 makes the latter have constant light intensity output valve.
Mixing optical signal through light amplification is exported from semiconductor optical amplification device 100, enters more letters through optical connecting device 300
Road optical receiver apparatus 200, mixing optical signal initially enter optical demultiplexer 201.The different of 201 wavelength basis of optical demultiplexer will
Four kinds of optical signals are detached to the different output end in four tunnels.Optical demultiplexer 201 can be the integrated optical demultiplexer of Miniaturizable
One of 201 types, such as dielectric film type, grating type or planar waveguide-type.
The four road optical signals detached from optical demultiplexer 201 respectively enter four narrow-band filterings of narrow band filter group 202
Device 202a/202b/202c/202d.The light that semiconductor optical amplifier 104 can generate its spontaneous radiation during light amplification
It is added on signal light and forms spontaneous emission noise, spontaneous emission noise is the main noise of semiconductor optical amplifier 104.It is spontaneous
It is random to radiate the optical wavelength generated, therefore 104 amplified signal light of semiconductor optical amplifier has wide spectral background, causes
The signal-to-noise ratio of signal light declines, this will seriously affect the result of detection of multi-channel optical reception device 200.Narrow band filter 202a/
The effect of 202b/202c/202d is the above-mentioned spontaneous emission noise for filtering out each road signal light and carrying, and improves the noise of signal light
Than.Narrow band filter 202a/202b/202c/202d is respectively provided with middle cardiac wave corresponding with 201 4 output ends of optical demultiplexer
1/ λ of a length of λ, 2/ λ, 3/ λ 4, and filter bandwidth value having the same（Three dB bandwidth）, this filter bandwidth value, which at least meets, can filter out respectively
The above-mentioned wide spectrum background of centre wavelength signal light, to ensure the signal-to-noise ratio of each wavelength signals light.
Photoelectric detection module is respectively enterd through the filtered four roads signal lights of narrow band filter 202a/202b/202c/202d
Four photoelectric detection module 203a/203b/203c/203d of group 203.In photoelectric detection module 203a/203b/203c/203d
Portion includes identical photodetector and preposition electric signal amplifier.Photoelectric detection module 203a/203b/203c/203d is to entering
The signal light penetrated carries out the effects that opto-electronic conversion and electric signal amplification respectively.
Semiconductor optical amplifier 104 is a complicated control process to the amplification of four kinds of wavelength channels, in different biasings
Under the control of electric current, semiconductor optical amplifier 104 has different gain curves, and the light of four kinds of wavelength of every gain curve pair
Signal has different gain coefficients.Due to the gain coefficient and bias current and lambda1-wavelength of semiconductor optical amplifier 104
Complex relationship, under the control of certain bias currents, the total output intensity of mixing optical signal of semiconductor optical amplifier 104 is meter
Draw output intensity Pset, but between the gain coefficient of four kinds of wavelength channels have prodigious difference, such case be easy to cause as
Lower two kinds of results：Certain wavelength channels with lowest gain coefficient are amplified in four kinds of wavelength channels, and light intensity value is small
The minimum detection limit Pomin of photoelectric detection module is corresponded in multi-channel optical reception device 200；Have in four kinds of wavelength channels
There are certain wavelength channels of highest-gain coefficient amplified, light intensity value, which is more than in multi-channel optical reception device 200, corresponds to light
The maximum probe limit Pomax of electric detecting module.Above two result can all increase by 203 electric signal output of photoelectric detection module group
As a result the bit error rate.
It, also can be in order to make semiconductor optical amplifier 104 that there is the gain coefficient of relatively flat to four kinds of wavelength channels
The ends Odemux monitoring module 204 is added after photoelectric detection module 203a/203b/203c/203d, to control semiconductor optical amplifier
104 bias current makes with respect to four kinds wavelength channels of gain curve of semiconductor optical amplifier 104 at this time more in appropriate value
It is flat.The ends Odemux monitoring module 204 is used to control semiconductor optical amplification according to the electric signal that photoelectric detection module group 203 exports
The bias current of device 104, including electric signal detector, microprocessor and memory, electric signal detector and memory with it is micro-
Processor is electrically connected, and microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier 104, electric signal detector
Voltage value for obtaining the output of n photoelectric detection module, microprocessor are used to control semiconductor light according to above-mentioned voltage value and put
The bias current of big device 104.Pass through the feedback effect of the ends SOA monitoring module 105 or the ends Odemux monitoring module 204 so that more
The optical signal that photodetector in the photoelectric detection module of channel optical receiver apparatus 200 obtains within detection threshold, to
Reduce the bit error rate of electric signal output result.The ends Odemux monitoring module 204 has prestored photodetection in its memory
Electrical signal intensity the output area Vomin ~ Vomax, Vomin and Vomax of module 203a/203b/203c/203d is respectively and light
The light intensity detection limit Pomin and Pomax of electric detecting module 203a/203b/203c/203d is corresponding, concurrently set Vomin ~
A certain value Vset is that the plan of each photoelectric detection module exports electrical signal intensity value, and the tolerance of Vset is arranged within the scope of Vomax
For Δ V.
Tetra- tunnels microprocessor monitors photoelectric detection module 203a/203b/203c/203d of the ends Odemux monitoring module 204
The intensity of electric signal exports as a result, four tunnel electrical signal intensities are exported results and Vomin ~ Vomax and Vset ± Δs V by counting circuit
Two ranges are made comparisons, and are ideal output knot when four tunnel electrical signal intensity output results are all fallen within the scope of Vset ± Δs V
Fruit, it is believed that the ends Odemux monitoring module 204 is ideal operation to the control of semiconductor optical amplifier 104；When four road electric signals are strong
At least electrical signal intensity output result is higher than Vset+ Δ V values all the way in degree output result, and four tunnel electrical signal intensities export result
When both greater than Vomin, the microprocessor of the ends Odemux monitoring module 204 reduces the bias current of semiconductor optical amplifier 104, with
Reduce the gain of semiconductor optical amplifier 104；When at least electrical signal intensity exports all the way in four tunnel electrical signal intensity output results
As a result it is less than Vset- Δ V values, and when four tunnel electrical signal intensities output results are both less than Vomax, the ends Odemux monitoring module 204
Microprocessor increase the bias current of semiconductor optical amplifier 104, to increase the gain of semiconductor optical amplifier 104；When four
When at least electrical signal intensity output result is less than Vomin values or higher than Vomax values all the way in the electrical signal intensity output result of road,
The bias current pressure of semiconductor optical amplifier 104 is set as initial value by the microprocessor of the ends Odemux monitoring module 204.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, on the premise of not exceeding the technical scheme recorded in the claims also other variations and modifications.
Claims (8)
1. a kind of multi-channel optical receiving unit of integrated light amplifier, which is characterized in that connect including semiconductor optical amplification device, light
Connection device and multi-channel optical reception device, optical signal is entered by the input terminal of the semiconductor optical amplification device, described partly to lead
Body optical amplification device is connect with the multi-channel optical reception device by the optical connecting device, and optical signal passes through described half successively
Conductor optical amplification device and the optical connecting device enter the multi-channel optical reception device, become electric signal by opto-electronic conversion
It is exported from multi-channel optical reception device,
The optical connecting device includes spherical connecting pin and concave ball shape connecting pin, and the spherical shape connecting pin is that an end face is connected to
The cylindrical connecting pin of semiconductor optical amplification device output end, another end face of the connecting pin be equipped with protrusion, the protrusion outside
The longitudinal section of edge is the circular arc that radius of curvature is R, and the cross section at raised center is the disk of a diameter of D；The concave ball shape
Connecting pin is the cylindrical connecting pin that an end face is connected to multi-channel optical reception device input terminal, is coordinated with spherical connecting pin,
Another end face of the connecting pin is equipped with groove, and the peripheral side wall of the groove is the circular arc that longitudinal section radius of curvature is R, groove
Bottom centre cross section is the disk of a diameter of D；The spherical shape connecting pin and concave ball shape connecting pin pass through laser welding.
2. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 1, which is characterized in that described half
Conductor optical amplification device include several light paths, beam splitter, preposition optoisolator, preposition coupled lens, semiconductor optical amplifier,
The ends SOA monitoring module, postposition coupled lens and postposition optoisolator, several light paths include light path L1, light path L2 and light path
L3, the light path L1 be optical signal input light path, into light path L1 optical signal then pass through beam splitter after respectively enter light
Road L2 and light path L3, the optical signal into light path L2 pass through preposition optoisolator, preposition coupled lens, semiconductor optical amplification successively
Device, postposition coupled lens and postposition optoisolator, the optical signal into light path L3 enter the ends SOA monitoring module, the ends the SOA prison
Control module is electrically connected with the semiconductor optical amplifier.
3. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 2, which is characterized in that described
The ends SOA monitoring module is used to control the bias current of semiconductor optical amplifier according to the light signal strength for entering light path L3, including
Photodetector, microprocessor and memory, the photodetector and the memory are electrically connected with microprocessor, described
Microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier, and the photodetector is for obtaining light path L3
In light signal strength, the microprocessor is for calculating the light signal strength in light path L2 and control semiconductor optical amplifier
Bias current.
4. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 2, which is characterized in that the light
Beam splitter is that splitting ratio is 90:10 beam splitter.
5. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 1, which is characterized in that described more
Channel optical receiver apparatus includes several light paths, optical demultiplexer, narrow band filter group, photoelectric detection module group and the ends Odemux prison
Module is controlled, optical signal enters the optical demultiplexer by light path from concave ball shape connecting pin, n items are separated behind the optical multiplexer
Light branch, every light branch end are attached via corresponding narrow band filter with corresponding photoelectric detection module respectively, n
Photoelectric detection module constitutes photoelectric detection module group, end and the ends the Odemux monitoring module of the photoelectric detection module group
Electrical connection, the ends Odemux monitoring module are electrically connected with semiconductor optical amplifier.
6. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 5, which is characterized in that described narrow
The bandpass filter that band filter group corresponds respectively to n item light branch optical signal centre wavelengths by n is constituted.
7. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 5, which is characterized in that the light
Electric detecting module is made of photodetector and preposition electric signal amplifier, is respectively used to opto-electronic conversion and Current amplifier.
8. a kind of multi-channel optical receiving unit of integrated light amplifier according to claim 5, which is characterized in that described
The ends Odemux monitoring module is used to control the biased electrical of semiconductor optical amplifier according to the electric signal that photoelectric detection module group exports
Stream, including electric signal detector, microprocessor and memory, the electric signal detector and memory are electrically connected with microprocessor
It connects, the microprocessor is electrically connected with the bias current control module of semiconductor optical amplifier, and the electric signal detector is used for
The voltage value of n photoelectric detection module output is obtained, the microprocessor is used to control semiconductor light according to above-mentioned voltage value and put
The bias current of big device.
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| CN114122906A (en) * | 2021-11-02 | 2022-03-01 | 深圳市欧深特信息技术有限公司 | Semiconductor optical amplifier drive protection circuit, control method thereof and optical module |
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