CN106330328A - Optical module and optical signal output control method - Google Patents
Optical module and optical signal output control method Download PDFInfo
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- CN106330328A CN106330328A CN201510404751.4A CN201510404751A CN106330328A CN 106330328 A CN106330328 A CN 106330328A CN 201510404751 A CN201510404751 A CN 201510404751A CN 106330328 A CN106330328 A CN 106330328A
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Abstract
An embodiment of the present invention provides an optical module and an optical signal output control method thereof. The optical module comprises a distributed Bragg reflective DBR laser, a driving circuit for supplying a driving current to the active region of the laser, a first current source, a second current source, and a circuit switching unit. The first and second current sources are used for outputting a first current and a second current. The two input ends of the circuit switching unit are respectively connected to the current output ends of the first and second current sources. The output end of the circuit switching unit is connected to the DBR area of the laser. The circuit switching unit is used for connecting the current output end of the first current source to the DBR area of the laser to output the first current to allow the laser to transmit an optical signal with operating wavelength, after an optical transmitting signal is received. The circuit switching unit is further used for connecting the DBR current output end of the second current source to the DBR area of the laser to output the second current to allow the laser to transmit an optical signal with non-operating wavelength, after an optical stopping signal is received. The optical module is operated in a burst mode and wavelength shift of the optical signal emitted by the laser is small.
Description
Technical field
The present invention relates to technical field of photo communication, specifically, the present invention relates to a kind of optical module and
Optical signal output control method.
Background technology
At present, passive optical network PON (Passive Optical Network) is as multi-plexing light accessing system
Through being widely deployed.PON generally be specially based on TDM (Time division Mutiplexing,
Time division multiplex) PON or based on WDM (Wavelength Division Multiplexing,
Wavelength-division multiplex) PON.
The configuration diagram of a kind of PON based on WDM as shown in Figure 1a, generally includes: arrange
Central office side optical line terminal OLT (Optical Line Terminal) 101, be arranged on terminal
N optical network unit ONU (Optical Network Unit) 102, and be connected to OLT101
And the ODN (Optical Distribution Network, optical distribution network) between ONU102.n
The usually natural number of 1-16.OLT101 is usually provided with n optical module, in OLT101
Optical module is connected to the AWG of OLT side in ODN (Arrayed Waveguide by optical fiber
Grating, array waveguide grating) 131 one of n uplink port, be used for launching downlink optical signal
Or reception uplink optical signal；The downlink port of the AWG of OLT side and the ONU side in ODN
The uplink port light path of AWG132 communicates；ONU102 generally arranges an optical module, ONU102
In optical module be connected by one of n downlink port of optical fiber and AWG132, be used under reception
Traveling optical signal or transmitting uplink optical signal.
Optical module is generally connected with communication system, sends for the optical signal of reception is converted to the signal of telecommunication
Process to communication system, or pass through light after the communication system reception signal of telecommunication is converted to optical signal
Fine transmission.
Launch as a example by uplink optical signal by optical module, the structural representation of optical module such as figure in ONU102
Shown in 1b, generally include: laser instrument 121 and drive circuit 122 and MCU123 thereof.
Wherein, laser instrument 121 usually LD (Laser Diode, laser diode), it is launched
The wavelength of laser can be regulated by TEC (Thermo Electric Cooler, thermoelectric refrigerator).
Laser instrument 121 typically operates under burst mode: MCU123 receives what communication system sent
During the signal of telecommunication, control drive circuit 122 and electric current will be driven to export to laser instrument 121 so that laser instrument
121 open, and are launched the uplink optical signal of provision wavelengths in ITU standard also by laser instrument 121
Output；When MCU123 does not receives the signal of telecommunication that communication system is launched, by cutting off laser instrument 121
Driving electric current close laser instrument 121 so that laser instrument 121 stop launch optical signal.
The uplink optical signal launched when laser instrument 121 is transferred to what AWG132 and this ONU was connected
During downlink port, if this downlink port that the wavelength of this uplink optical signal is in AWG132 allows logical
In the wave-length coverage crossed, then this uplink optical signal will be transmitted to OLT101 by AWG132；If
The wavelength of this uplink optical signal is not in the wave-length coverage that this downlink port permission of AWG132 is passed through
In, then this uplink optical signal will be intercepted by AWG132, it is impossible to continues transmission.Visible, AWG132
This optical module, in addition to wavelength-division multiplex demultiplexes, also has the effect of filtering.
Along with the development of optical communication technique and the bandwidth demand bigger in order to meet user, PON is gradually
To NG-PON2 (Next Generation-Passive Optical Network stage2, nothing of future generation
The source optical-fiber network stage 2) evolution.(Full Service Access Networks, full-service connects FSAN
Enter network) tissue by TWDM (Time Wavelength division Mutiplexing, time partial wave
One of divide multiplexing) standard being defined as NG-PON2 enforcement.
In theory, TWDM standard is the product that TDM and WDM standard combines.Such as, right
Each downlink port of the AWG of ONU side in PON based on WDM, with this downstream end
Optical module in multiple ONU that mouth light path communicates, with the method difference of time division multiplex (i.e. TDM)
The uplink optical signal of Same Wavelength is sent to OLT；Be equivalent to the laser instrument of optical module in multiple ONU
Share same up optical channel.
But, it was found by the inventors of the present invention that for the multiple ONU sharing same up optical channel
In laser instrument, the wavelength of its uplink optical signal launched under burst mode is susceptible to the most serious
Drift (such as more than 100Ghz), thus adjacent up optical channel is produced crosstalk, causes
Uplink optical signal is disorderly, even results in the paralysis of whole optical access network.
Therefore, it is necessary to provide a kind of optical module and optical signal output control method thereof, to launch wavelength
More stable optical signal.
Summary of the invention
The shortcoming that the present invention is directed to prior art, proposes a kind of optical module and optical signal output controlling party thereof
Method, the wavelength of optical signal drift that the optical module existed in order to solve prior art exports under burst mode
The most serious problem.
The embodiment of the present invention is in terms of one, it is provided that a kind of optical module, including: distributed Bragg
Reflection DBR laser and the active area for described laser instrument provide the drive circuit driving electric current,
Also include:
First and second current source, is respectively used to export first and second electric current；
Switch circuit units, two input respectively with the current output terminal phase of first and second current source
Even, its outfan is connected with the DBR district of described laser instrument, is used for receiving optical signal transmission signal
After, the current output terminal of the first current source is connected to the DBR district of described laser instrument, swashs to described
Light device exports the first electric current so that the optical signal of operation wavelength launched by described laser instrument；And receive
After optical signal stops signal, the current output terminal of the second current source is connected to the DBR of described laser instrument
District, exports the second electric current to described laser instrument so that the light letter of inoperative wavelength launched by described laser instrument
Number.
Embodiments of the invention, in terms of another, additionally provide the optical module of a kind of optical network unit
Optical signal output control method, including:
After receiving optical signal transmission signal, the electric current of the first current source in described optical module is exported
End is connected to the DBR district of DBR laser in described optical module, to described laser instrument conveying the first electricity
First electric current of stream source output so that the optical signal of operation wavelength launched by described laser instrument；
After receiving optical signal stopping signal, the electric current of the second current source in described optical module is exported
The DBR district being connected to described laser instrument is changed in end-grain cutting, carries the second current source output to described laser instrument
The second electric current so that described laser instrument launch inoperative wavelength optical signal；
Wherein, the active area that the drive circuit in described optical module is described laser instrument provides and drives electricity
Stream.
In the embodiment of the present invention, the switch circuit units in optical module receives optical signal transmission signal
After, the current output terminal of the first current source in optical module is connected to the DBR district of laser instrument, to
Laser instrument exports the first electric current so that laser instrument launches the optical signal of operation wavelength, the light of operation wavelength
Signal can be transmitted by having the optical module of filter function in PON；And receive light
After signal stops signal, the current output terminal of the second current source in optical module is connected to laser instrument
DBR district, exports the second electric current to laser instrument so that the optical signal of inoperative wavelength launched by laser instrument,
The optical signal of inoperative wavelength is intercepted by this optical module；Thus in the optical module of the embodiment of the present invention
Laser instrument achieves launches optical signal in a burst mode.And, in the optical module of the embodiment of the present invention,
Laser instrument, without turning off, can realize launching optical signal in a burst mode, with existing in the on state
Optical module need to realize launching optical signal in a burst mode and compare by being switched on and off laser instrument,
The state of the laser instrument in embodiment of the present invention light film block is more stable, and the caloric value of laser instrument is more steady
Fixed, can the temperature of stable laser effectively, reduce its that caused because of laser temperature drift
The wave length shift of the optical signal penetrated, thus improve stablizing of the wavelength of the optical signal that laser instrument is launched
Property.
Aspect and advantage that the present invention adds will part be given in the following description, and these will be from following
Description in become obvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Present invention aspect that is above-mentioned and/or that add and advantage are from retouching embodiment below in conjunction with the accompanying drawings
Will be apparent from easy to understand in stating, wherein:
Fig. 1 a is the configuration diagram of the PON based on WDM of prior art；
Fig. 1 b is the internal circuit schematic diagram of the optical module of prior art；
Fig. 2 is the configuration diagram of the PON based on TWDM of the embodiment of the present invention；
Fig. 3 a is the internal circuit schematic diagram of the optical module of the embodiment of the present invention；
Fig. 3 b is the principle schematic of the DBR laser of the embodiment of the present invention；
Fig. 3 c is the internal circuit schematic diagram of the switch circuit units of the embodiment of the present invention；
Fig. 3 d is the circuit diagram of a special case of the switching single channel unit of the embodiment of the present invention；
Fig. 4 is the schematic flow sheet of the optical signal output control method of the optical module of the embodiment of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, its
In the most same or similar label represent same or similar element or have same or like
The element of function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this
Invention, and be not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative used herein
" one ", " one ", " described " and " being somebody's turn to do " may also comprise plural form.Should manage further
Solve, the wording used in the description of the present invention " include " referring to existing described feature, integer,
Step, operation, element and/or assembly, but it is not excluded that existence or add one or more other
Feature, integer, step, operation, element, assembly and/or their group.It should be understood that when me
Claim element to be " connected " or during " coupled " to another element, it can be directly connected or coupled to
Other elements, or intermediary element can also be there is.Additionally, " connection " used herein or " coupling
Connect " wireless connections can be included or wireless couple.Wording "and/or" used herein includes one
Or more be associated list the whole of item or any cell and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein
(including technical term and scientific terminology), have and the those of ordinary skill in art of the present invention
Be commonly understood by identical meaning.Should also be understood that those arts defined in such as general dictionary
Language, it should be understood that there is the meaning consistent with the meaning in the context of prior art, and remove
Non-as here by specific definitions, otherwise will not with idealization or the most formal implication explain.
It was found by the inventors of the present invention that in existing PON based on WDM, if multiple ONU
Optical module is all connected to the same port of the AWG of ONU side, and multiple ONU is with the side of TDM
Method shares same up optical channel, the laser instrument in the most multiple ONU be required for each regulation time
Complete in gap the signal of telecommunication of communication system is converted into the uplink optical signal of Same Wavelength and launches
Process；Compared with exclusively enjoying this up optical channel with an ONU, the laser instrument in multiple ONU
Switching frequency (i.e. the frequency of the opening and closing of drive circuit) is greatly increased, and causes the temperature of laser instrument
Degree change is more frequent, easily occurs that TEC has little time to be adjusted to laser instrument the phenomenon of design temperature,
Thus cause the wavelength of the uplink optical signal that laser instrument launches to occur the most serious drift (such as to exceed
100Ghz), other up optical channels are produced crosstalk, cause uplink optical signal disorderly, even result in
Whole optical access network is paralysed.
Present inventor have further discovered that, existing laser works is at burst mode, i.e. laser instrument is sent out
The optical signal penetrated is actually pulse signal, the dutycycle of optical signal generally with the electricity of communication system transmission
The length of signal is directly proportional；For optical module, the length of the signal of telecommunication that communication system sends be with
Machine change, cause the dutycycle of optical signal being also continually changing, and launch what dutycycle was continually changing
Optical signal typically results in the heat that in optical module, laser instrument produces and is also being continually changing, thus causes laser
There is the most serious drift in the wavelength of the uplink optical signal that device is launched.
Based on above-mentioned discovery, the light film block of the embodiment of the present invention have employed DBR (Distributed
Bragg Reflector, Distributed Bragg Reflection) laser instrument, increased newly switch circuit units and
First and second current source of first and second electric current that output current value is different；Switch circuit units can root
According to the optical signal transmission signal received, the first electric current of the first current source output is transported to laser instrument
DBR district so that laser instrument launch operation wavelength optical signal, this optical signal can by AWG to
OLT transmits；And switch circuit units can stop signal according to the optical signal received, by the second electricity
Second electric current of stream source output is transported to the DBR district of laser instrument so that inoperative ripple launched by laser instrument
Long optical signal, but this optical signal cannot be transmitted to OLT by AWG, is equivalent to this laser
Optical signal do not launched by device；Thus this laser instrument achieves and launches optical signal in a burst mode.
And, in the optical module of the embodiment of the present invention, laser instrument, without turning off, is in the on state
Can realize launching optical signal in a burst mode, the state of laser instrument is more stable, the caloric value of laser instrument
More stable, can the temperature of stable laser effectively, reduce because laser temperature drift is caused
Its wave length shift of optical signal launched, thus improve the wavelength of the optical signal that laser instrument is launched
Stability, goes for the PON of TWDM.
Further, in the optical module of the embodiment of the present invention, load on laser instrument DBR district first,
Size of current between two electric currents can be arranged to differ the least, the duty of the optical signal that laser instrument is launched
Than continuing close to 100%, it is continually changing with existing laser instrument transmitting dutycycle and (such as exists
Be continually changing between 10%-90%) optical signal compare, laser instrument produce thermal difference less, can
With the temperature of stable laser effectively, reduce its light launched caused because of laser temperature drift
The wave length shift of signal, thus improve the stability of the wavelength of the optical signal that laser instrument is launched.
The most specifically introduce the technical scheme of the embodiment of the present invention.
The configuration diagram of the PON based on TWDM of the embodiment of the present invention is as in figure 2 it is shown, include:
The OLT201 of centrally disposed local side, it is arranged on multiple ONU202 of terminal, and is connected to
ODN between OLT201 and multiple ONU202.
Wherein, ODN includes the AWG232 of AWG231 and ONU side of OLT side.
Being provided with i optical module in OLT201, each optical module in OLT201 is connected respectively by optical fiber
Receive one of i uplink port of AWG231 of OLT side, be used for launching downlink optical signal or connecing
Receiving uplink optical signal, i is natural number.The downlink port of the AWG231 of OLT side and ONU side
The uplink port light path of AWG232 communicates.
ONU202 arranges an optical module, is used for receiving downlink optical signal or launching up light letter
Number.Optical module is generally connected with communication system, sends for the optical signal of reception is converted to the signal of telecommunication
Process to communication system, or pass through light after the communication system reception signal of telecommunication is converted to optical signal
Fine transmission.
Being provided with j downlink port in the AWG232 of ONU side, j is natural number.For ONU
Each downlink port in the AWG232 of side, the optical module in several ONU202 passes through respectively
Optical fiber is connected with this downlink port.
J the downlink port of the AWG232 of ONU side is corresponding with j channel respectively.ONU side
The downlink port of AWG232, and in all ONU202 being connected to this downlink port
Optical module shares same channel.Channel may include that centre wavelength and bandwidth.
Operation wavelength and the inoperative of laser instrument in optical module is introduced below as a example by the optical module of ONU
Wavelength.
Specifically, if the optical module in ONU202 is descending with the kth of the AWG232 of ONU side
Port light path communicates, then allowed the kth downlink port of the AWG232 of ONU side to pass through
The wavelength of optical signal, the operation wavelength of the laser instrument of the optical module being preset as in this ONU, and will remove
Other wavelength outside this operation wavelength, all as laser instrument non-of optical module in this ONU
Operation wavelength, k is the natural number of no more than j.
It is preferred that can be by its in addition to kth downlink port of the AWG232 of ONU side
Its downlink port is allowed the wavelength of the optical signal passed through, swashing of the optical module being preset as in this ONU
The inoperative wavelength of light device；And then the kth+1 of the AWG232 of ONU side or k-1 downstream end
Mouth is allowed the wavelength of optical signal passed through, and is all that the operation wavelength of laser instrument with this optical module is adjacent
Wavelength.
More preferably, for communicating with the kth downlink port light path of the AWG232 of ONU side
Optical module in ONU202, can be permitted the kth+1 of AWG232 or k-1 downlink port
The wavelength of the optical signal perhaps passed through, i.e. adjacent with the operation wavelength of the laser instrument of this optical module wavelength,
Inoperative wavelength as the laser instrument of the optical module in this ONU.
Such as, as shown in table 1 below, ONU in the PON based on TWDM of the embodiment of the present invention
The AWG232 of side has 16 downlink ports, the optical signal that each downlink port is allowed to pass through
Mid frequency and bandwidth that the centre wavelength of channel, centre wavelength are corresponding all meet ITU-T standard.
Table 1
In above-mentioned table 1, Channel Number represents the downlink port of the AWG232 of ONU side
Numbering, Channel Filter ITU Frequency represents the optical signal that downlink port is allowed to be passed through
Mid frequency, Channel Filter ITU Wavelength represents the light letter that downlink port is allowed to be passed through
Number centre wavelength；Each downlink port is allowed a width of 100Ghz of band of the optical signal passed through.If
5th downlink port of the AWG232 of ONU side is allowed the centre wavelength of the optical signal passed through
1541.35nm, as the operating wave with the laser instrument of the 5th optical module that downlink port light path communicates
Long, then in 1-4,6-16 of the AWG232 of ONU side, arbitrary downlink port is allowed to pass through
The centre wavelength of optical signal, is all the inoperative wavelength of the laser instrument of this optical module；And then the 4th and 6
Downlink port allowed centre wavelength 1542.14nm of the optical signal passed through, 1540.56nm be all with
The wavelength that the operation wavelength of the laser instrument of this optical module is adjacent.
Those skilled in the art of the present technique are appreciated that, although have employed AWG in the embodiment of the present invention and use
In wavelength-division multiplex and demultiplexing, but AWG can also be had wavelength-division multiplex and demultiplexing merit by other
Can device replace, such as, FBG (Fiber Bragg Gratting, Fiber Bragg Grating FBG) or
Person TFF (Thin Film Filter, Thin Film Filter) etc..
The internal circuit schematic diagram of the optical module in ONU202 as shown in Figure 3 a, including laser instrument
301, drive circuit the 302, first current source 303, second current source 304 of laser instrument 301 and cutting
Change circuit unit 305.It is preferred that the optical module of the embodiment of the present invention can also be applied to remove in PON
In other parts outside ONU, such as in OLT.
Wherein, laser instrument 301 can be specifically that distributed Bragg feeds back DBR laser, its knot
Structure schematic diagram as shown in Figure 3 a, including active area and DBR district.The active area of laser instrument 301
One end communicates with one end light path in DBR district.The wavelength of laser launched by laser instrument 301 can be by TEC
Regulation.
The current output terminal of drive circuit 302 is connected to the anode of the active area of laser instrument 301, is sharp
The active area of light device 301 provides and drives electric current.The light output end of the active area of laser instrument 301 (i.e. has
The other end of source region) communicate with a downlink port light path of the AWG232 of ONU side.
The operation principle of laser instrument 301 is: the active area of laser instrument 301 provides at drive circuit 302
The driving function of current under, launch the laser of multiple wavelength；The laser of multiple wavelength passes through active area
The one end communicated with DBR district light path, is incident to DBR district；Loaded in DBR district by change
The size of electric current, change the refractive index in DBR district, and then change the transmitance of DBR grating,
The laser making optionally higher to a certain transmitance wavelength in DBR district carries out concussion and amplifies；Shake
Swing the laser after amplification and be reflected back toward active area, and from the other end of active area, i.e. light output end, send out
Injection.
Such as, the operation principle schematic diagram of laser instrument 301 as shown in Figure 3 b, the abscissa in Fig. 3 b
Representing wavelength, vertical coordinate represents gain；The intensive vertical bar extended vertically up from horizontal positive axis,
Represent active area potentially multiple mode, the i.e. active area of laser instrument 301 launch a large amount of different wave lengths (or
Frequency) laser；It is positioned at the broken line above intensive vertical bar, represents active area model selection, i.e.
The size of current being carried in the DBR district of laser instrument 301 by change changes the refraction in DBR district
Rate, and then change the transmitance of DBR grating, swashing of wavelength high to some transmitance selectively
Light carries out concussion and amplifies；Vertical bar the highest in intensive vertical bar, represent lasing mode, be by
The laser of a certain wavelength that the concussion of DBR district is amplified, the laser launched as laser instrument 301 is from active
District's transmission and go out.
Laser instrument 301 can launch operation wavelength or the optical signal of inoperative wavelength；It is preferred that laser
Device 301 can launch the optical signal meeting ITU standard；Such as, laser instrument 301 can be launched
State the optical signal of centre wavelength in table 1.
First current source 303 is for output the first electric current.It is preferred that the first current source 303 output
First electric current can reach the precision of 10 μ A (microampere)；Can be regulated by the controller in optical module
The size of the first electric current.It is true that controller can be specifically the former MCU being integrated in optical module,
Additionally, controller can also be one of following device or circuit: FPGA (Field-Programmable
Gate Array, field programmable gate array), logic gates, CPU (Central Processing
Unit, central processing unit).
Second current source 304 is for output the second electric current.First electric current of the first current source 303 output
Current value (i.e. size) be different from second current source 304 output the second electric current.It is preferred that the
Second electric current of two current source 304 outputs can reach the precision of 10 μ A；Can be by optical module
Controller regulates the size of the second electric current.
Switch circuit units 305, two input respectively with first current source the 303, second electric current
The current output terminal electrical connection in source 304, its outfan electrically connects with the DBR district of laser instrument 301,
It controls the communication system that end is connected to dock with optical module；Switch circuit units 305 receives communication system
The signal that system sends.Such as, communication system, when needs carry out data transmission, i.e. needs to open optical mode
When the optical signal of block exports, output optical signal transmission signal is to switch circuit units 305；Terminate or
When stopping data transmission, output optical signal stops signal to switch circuit units 305.It is preferred that light
Signal can be low level Tx_Burst_Enable signal, and optical signal stops signal can
To be the Tx_Burst_Enable signal of high level.
Switch circuit units 305, will after receiving the optical signal transmission signal that communication system sends
The current output terminal of the first current source 303 is connected to the DBR district of laser instrument 301, to laser instrument 301
Export the first electric current so that the optical signal of operation wavelength launched by laser instrument 301；And receive communication
After the optical signal that system sends stops signal, it is connected to swash by the current output terminal of the second current source 304
The DBR district of light device 301, exports the second electric current to laser instrument 301 so that laser instrument 301 is launched
The optical signal of inoperative wavelength.
Owing to the optical signal of the operation wavelength of laser instrument 301 transmitting can be by ONU side
AWG232, the optical module transmission in OLT201；And the inoperative wavelength that laser instrument 301 is launched
Optical signal will be intercepted by the AWG232 of ONU side, it is impossible to continue transmission, optical mode in OLT201
Block does not receives this optical signal, is equivalent to laser instrument 301 and does not sends optical signal；Thus laser instrument 301
Achieve and launch optical signal in a burst mode.Now, this optical module of the AWG232 of ONU side
In addition to wavelength-division multiplex demultiplexes, also act the effect of filtering.
It is preferred that the current output terminal of the second current source 304 is connected to the DBR district of laser instrument 301,
Export the second electric current to laser instrument 301 so that laser instrument 301 launch in inoperative wavelength with operating wave
The optical signal of long adjacent wavelength.So, between the first electric current and the second electric current, gap is less, significantly
Reduce the amplitude of variation of the electric current in the DBR district loading on laser instrument 301, prevent the prominent of big electric current
Become the laser instrument 301 junction temperature cataclysm caused so that laser instrument 301 caloric value and temperature are more stable,
Be conducive to stable laser temperature, be greatly reduced because of laser temperature drift caused its launch
The wave length shift of optical signal.
It is preferred that in the light film block of the embodiment of the present invention, also include: filtering assembly (is not marked in figure).
Filtering assembly, its one end communicates with the light output end light path of the active area of laser instrument 301, and it is another
One end communicates with a port light path of AWG, the operation wavelength launched for transmission laser device 301
Optical signal, and intercept the optical signal of inoperative wavelength that laser instrument 301 is launched；From filtering assembly
Continuation is transmitted by the optical signal of the operation wavelength transmitted, and the inoperative wavelength intercepted by filtering assembly
Optical signal cannot continue transmission, it is achieved thereby that the optical module of the embodiment of the present invention is sent out in a burst mode
Penetrate optical signal.Filtering assembly can be specifically optical filter, filter lens or distributed Bragg grating etc.
Deng.
It is preferred that switch circuit units 305 receives the optical signal transmission signal that communication system sends
After, the current output terminal of the first current source 303 is connected to the DBR district of laser instrument 301, and breaks
Open the connection between current output terminal and the DBR district of laser instrument 301 of the second current source 304.
After switch circuit units 305 receives the optical signal stopping signal that communication system sends, by second
The current output terminal of current source 304 is connected to the DBR district of laser instrument 301, and disconnects the first electric current
Connection between current output terminal and the DBR district of laser instrument 301 in source 303.
More excellent, the internal circuit schematic diagram of switch circuit units 305 as shown in Figure 3 c, including:
First switching circuit the 351, second switching circuit 352 and the 3rd switching circuit 353.
Wherein, the first switching circuit 351, its common port is defeated as of switch circuit units 305
Entering end to be connected with the current output terminal of the first current source 303, it controls end and is connected with controller 306.
Second switching circuit 352, its common port is as another input of switch circuit units 305
Being connected with the current output terminal of the second current source 304, it controls end and is connected with controller 306.
3rd switching circuit 353, its common port is as the outfan of switch circuit units 305 and laser
The anode in the DBR district of device 301 is connected, and one contact jaw (the f end in Fig. 3 c) is cut with first
The contact jaw (a end in Fig. 3 c) changing circuit 351 is connected, its another contact jaw (figure
E end in 3c) it is connected with a contact jaw (the d end in Fig. 3 c) of the second switching circuit 352,
It controls end and is connected with controller 306.
First switching circuit 351 and the 3rd switching circuit 353 are used for receiving optical signal transmission signal
After, the current output terminal of the first current source 303 is connected to the anode in the DBR district of laser instrument 301；
And second switching circuit 352 and the 3rd switching circuit 353 receive after optical signal stops signal, will
The current output terminal switching of the second current source 304 is connected to the anode in the DBR district of laser instrument 301.
The minus earth in the DBR district of laser instrument 301.
Specifically, as shown in Figure 3 c, the first switching circuit 351 receives light letter by its control termination
After number transmission signal, by the common port of the first switching circuit 351 and contact jaw (a end) Guan Bi,
And after the 3rd switching circuit 353 receives optical signal transmission signal by its control termination, cut the 3rd
Common port and a contact jaw (f end) of changing circuit 353 close, thus by the first current source 303
Current output terminal be connected to the anode in DBR district of laser instrument 301 so that the first current source 303
First electric current of output is delivered to the DBR district of laser instrument 301 so that work launched by laser instrument 301
The optical signal of wavelength.
As shown in Figure 3 c, the second switching circuit 352 receives optical signal stopping letter by its control termination
After number, by common port and contact jaw (d end) Guan Bi of the second switching circuit 352, and the
After three switching circuits 353 receive optical signal stopping signal by its control termination, by the 3rd switching circuit
The common port of 353 and contact jaw (e end) Guan Bi, thus by the electric current of the second current source 304
Outfan is connected to the anode in the DBR district of laser instrument 301 so that the second current source 304 output
Second electric current is delivered to the DBR district of laser instrument 301 so that inoperative wavelength launched by laser instrument 301
Optical signal.It is preferred that the second electric current of the second current source 304 output is delivered to laser instrument 301
DBR district so that the optical signal of wavelength adjacent with operation wavelength launched by laser instrument 301.
More excellent, as shown in Figure 3 c, switch circuit units 305 also includes: diode 354.
The anode of diode 354 and another contact jaw (b end) of the first switching circuit 351 are connected,
The minus earth of diode 354.
After first switching circuit 351 is additionally operable to receive optical signal stopping signal by its control termination, will
The current output terminal of the first current source 303 is connected to the anode of diode 354 so that the first current source
First electric current of 303 outputs is released by diode 354, with directly closedown the first current source 303 phase
Ratio, from 0 output until stably exporting the mistake of the first electric current when can avoid restarting the first current source 303
Journey, thus substantially reduce laser instrument 301 and launching optical signal and the transmitting operating wave of inoperative wavelength
Switch the required time between long optical signal, laser instrument 301 can be improved and launch the light of operation wavelength
The efficiency of signal.
Specifically, after the first switching circuit 351 receives optical signal stopping signal by its control termination,
The common port of the first switching circuit 351 and another contact jaw (b end) are closed.
It is preferred that switch circuit units 305 receives the optical signal transmission signal that communication system sends
After, the current output terminal of the first current source 303 is connected to the DBR district of laser instrument 301, and breaks
Open the connection between current output terminal and the DBR district of laser instrument 301 of the second current source 304.
More excellent, as shown in Figure 3 c, switch circuit units 305 also includes: diode 355.
The anode of diode 355 and another contact jaw (c end) of the second switching circuit 352 are connected,
The minus earth of diode 355.
After second switching circuit 352 is additionally operable to receive optical signal transmission signal, by the second current source
The current output terminal of 304 is connected to the anode of diode 355 so that the second current source 304 output
Second electric current is released by diode 355.
Specifically, after the second switching circuit 352 is additionally operable to receive optical signal transmission signal, by second
The common port of switching circuit 352 and another contact jaw (c end) close.
It is preferred that at least one characteristic following of diode 354 and diode 355 and laser instrument 301
The characteristic in DBR district identical: resistance to properties of flow, conducting resistance, bias voltage.So, the first electricity
The first electric current that stream source 303 carries to the DBR district of laser instrument 301, can be with the first current source 303
Same or like to the electric current of diode 354 conveying, eliminate or substantially reduce the first current source
303, during being switched to be connected with diode 354 from being connected with the DBR district of laser instrument 301,
The fluctuation of the first electric current of output, so that the first electric current of the first current source 303 output is more steady
Fixed.In like manner, the second electric current of the second current source 304 output is the most stable.
Further, as shown in Figure 3 c, switch circuit units 305 also includes: resistance 356.
Resistance 356, its one end is connected with the common port of the 3rd switching circuit 353, and its other end is with sharp
The anode in the DBR district of light device 301 is connected, for switching between buffering the first electric current and the second electric current,
At the current over pulse caused by the anode in the DBR district of laser instrument 301.
Further, as shown in Figure 3 c, switch circuit units 305 also includes: electric capacity 357.
Electric capacity 357, its one end is connected with the common port of the 3rd switching circuit 353, its other end ground connection,
First electric current of the anode reception for the DBR district of stable laser 301 or the second electric current.Relatively
Goodly, electric capacity 357 can be specifically the electric capacity of 10-100pf (pico farad).
A special case of switch circuit units 305 is described below, the circuit diagram of this special case such as figure
Shown in 3d, mainly include that model is all chip U33 and U34 of SGM3005, the first switching circuit
351 and second switching circuit 352 be integrated in chip U33, the 3rd switching circuit 353 is integrated in core
In sheet U34.
Specifically, COM1, NC1, NO1 and IN1 pin in chip U33, represent respectively
Common port, contact jaw (a end), contact jaw (b end) and control in first switching circuit 351
End.COM2, NC2, NO2 and IN2 pin in chip U33, represents the second switching respectively
Common port, contact jaw (c end), contact jaw (d end) and control end in circuit 352.
COM2, NC2, NO2 and IN2 pin in chip U34, represents the 3rd switching respectively
Common port, contact jaw (f end), contact jaw (e end) and control end in circuit 353.
IN1, IN2 pin in chip U33 and the IN2 pin in chip U34 all with ONU202
The communication system outside optical module be connected.
COM1, COM2 pin in chip U33 respectively with first current source the 303, second electric current
The current output terminal in source 304 is connected；NO1 pin in chip U33 is connected to diode 354
Anode, the minus earth of diode 354；NC2 pin in chip U33 is connected to diode 355
Anode, the minus earth of diode 355.
NO2, NC1 pin in chip U33 respectively with NO2, NC2 pin in chip U34
It is connected.
COM2 pin in chip U34 is connected in series to the DBR district of laser instrument 301 by resistance 356
Anode；One end of electric capacity 357 is connected with the COM2 pin in chip U34, other end ground connection.
It is (the most low level that chip U33 receives optical signal transmission signal by its IN1 pin
Tx_Burst_Enable signal) after, the COM1 pin in chip U33 is connected with NC1 pin,
And after chip U34 receives optical signal transmission signal by its IN2 pin, by chip U34
COM2 pin connect with NC2 pin；First electric current of the first current source 303 output, flows through
Chip U33 and U34 is input to the anode in the DBR district of laser instrument 301 so that 301, laser instrument
Penetrate the optical signal of operation wavelength.
It is preferred that after chip U33 receives optical signal transmission signal by its IN2 pin, by core
COM2 pin in sheet U33 connects with NC2 pin so that the of the second current source 304 output
Two electric currents, flow through chip U33 and diode 355 is released to ground.
Chip U33 by its IN2 pin receive optical signal stop signal (such as high level
Tx_Burst_Enable signal) after, the COM2 pin in chip U33 is connected with NO2 pin,
And after chip U34 receives optical signal stopping signal by its IN2 pin, by chip U34
COM2 pin connect with NO2 pin；Second electric current of the second current source 304 output, flows through
Chip U33 and U34 is input to the anode in the DBR district of laser instrument 301 so that 301, laser instrument
Penetrate the optical signal of inoperative wavelength.
It is preferred that after chip U33 receives optical signal stopping signal by its IN1 pin, by core
COM1 pin in sheet U33 connects with NO1 pin so that the of the first current source 303 output
One electric current, flows through chip U33 and diode 354 is released to ground.
It is true that the pin definitions after the ONU202 encapsulation of the embodiment of the present invention can be such as table 2 below
Shown in.
Table 2
In above-mentioned table 2, PIN represents the numbering of the pin of ONU, and Symbol represents the pin of ONU
Mark, Name/Description represents title or the description of the pin of ONU.
In actual applications, the controller 306 in the optical module in the ONU202 of the embodiment of the present invention
The optical signal that communication system sends can be obtained by above-mentioned table 2 is designated the pin of Tx_Burst
Transmission signal and optical signal stop signal.
More excellent, the pin definitions of the ONU202 in the embodiment of the present invention is assisted at standard SFF MSA
Improve to some extent on the basis of view.Such as, PIN1 in above-mentioned table 2, i.e. it is designated the pin of RxMon,
Add the definition to the control that firmware (firmware) upgrades.
Internal circuit based on above-mentioned optical module, the embodiment of the present invention additionally provides the light of a kind of optical module
Signal output control method, the schematic flow sheet of the method as shown in Figure 4, comprises the steps:
S401: after receiving optical signal transmission signal, by the current output terminal of the first current source 303 even
Receive the DBR district of laser instrument 301.
Specifically, after the switch circuit units 305 in optical module receives optical signal transmission signal, will
The current output terminal of the first current source 303 is connected to the DBR district of laser instrument 301, to laser instrument 301
Carry the first electric current of the first current source 303 output so that the light of operation wavelength launched by laser instrument 301
Signal.Drive circuit 302 is always for the active area offer driving electric current of laser instrument 301.
It is preferred that after switch circuit units 305 receives optical signal transmission signal, also by the second electric current
The current output terminal in source 304 is connected to the sun of the diode 355 being connected with switch circuit units 305
Pole so that the second electric current of the second current source 304 output is released by diode 355；This diode
Minus earth.
It is preferred that the light of the operation wavelength launched by the filtering assembly transmission laser device 301 in optical module
Signal so that this optical signal can arrive the port of AWG through filtering assembly；Wherein, light filter
One end of part communicates with the light output end light path of the active area of laser instrument 301, and the other end is with AWG's
Port light path communicates.
S402: after receiving optical signal stopping signal, by the current output terminal of the second current source 304 even
Receive the DBR district of laser instrument 301.
Specifically, after switch circuit units 305 receives optical signal stopping signal, by the second current source
The current output terminal of 304 is connected to the DBR district of laser instrument 301, carries second to laser instrument 301
The dbr current that current source defeated 304 goes out so that the optical signal of inoperative wavelength launched by laser instrument 301.
Drive circuit 302 is always for the active area offer driving electric current of laser instrument 301.
It is preferred that after switch circuit units 305 receives optical signal stopping signal, also by the first electric current
The current output terminal in source 303 is connected to the sun of the diode 354 being connected with switch circuit units 305
Pole so that the first electric current of the first current source 303 output is released by diode 354；This diode
Minus earth.
It is preferred that intercepted the optical signal of the inoperative wavelength that laser instrument 301 is launched by filtering assembly.
In the embodiment of the present invention, the optical signal of the operation wavelength that the laser instrument of optical module is launched, Ke Yitong
Cross and PON has the optical module of filter function be transmitted；And the inoperative ripple that laser instrument is launched
Long optical signal will be intercepted by this optical module, be equivalent to laser instrument and not launch optical signal；Thus this
Laser instrument in the optical module of bright embodiment achieves launches optical signal in a burst mode.
And, in the optical module of the embodiment of the present invention, switch circuit units receives optical signal transmission letter
After number, the current output terminal of the first current source is connected to the DBR district of laser instrument, defeated to laser instrument
Go out the first electric current so that the optical signal of operation wavelength launched by laser instrument；And receive optical signal stopping
After signal, the current output terminal of the second current source is connected to the DBR district of laser instrument, to laser instrument
Export the second electric current so that the optical signal of inoperative wavelength launched by laser instrument.Need with existing optical module
Will realize launching optical signal in a burst mode compare by being switched on and off laser instrument, the present invention implements
Laser instrument in the optical module of example, it is not necessary to turn off, can realize in the on state sending out in a burst mode
Penetrating optical signal, the state of laser instrument is more stable, and the caloric value of laser instrument is more stable, can be effective
The temperature of ground stable laser, its optical signal launched that reduction is caused because of laser temperature drift
Wave length shift, thus improve the stability of the wavelength of the optical signal that laser instrument is launched, go for
The PON of TWDM.
More preferably, in the optical module of the embodiment of the present invention, load on laser instrument DBR district first,
Size of current difference between two electric currents is the least, and the dutycycle of the optical signal that laser instrument is launched continues close
In 100%, compared with the optical signal that existing laser instrument transmitting dutycycle is continually changing, laser instrument produces
Raw thermal difference is less, can the temperature of stable laser effectively, reduce because laser temperature is floated
Move the wave length shift of its optical signal launched caused, thus improve the optical signal that laser instrument is launched
The stability of wavelength.
Further, the optical module of the embodiment of the present invention, can carry out on the basis of existing optical module
Local improvement forms, and compared with the brand-new design whole optical module of exploitation, has more preferable compatibility, becomes
This is cheap, contributes to reducing the networking cost of PON based on TWDM.
The above is only the some embodiments of the present invention, it is noted that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, it is also possible to make some improvement
And retouching, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. an optical module, including: Distributed Bragg Reflection DBR laser and be described
The active area of laser instrument provides the drive circuit driving electric current, it is characterised in that also include:
First and second current source, is respectively used to export first and second electric current；
Switch circuit units, two input respectively with the current output terminal phase of first and second current source
Even, its outfan is connected with the DBR district of described laser instrument, is used for receiving optical signal transmission signal
After, the current output terminal of the first current source is connected to the DBR district of described laser instrument, swashs to described
Light device exports the first electric current so that the optical signal of operation wavelength launched by described laser instrument；And receive
After optical signal stops signal, the current output terminal of the second current source is connected to the DBR of described laser instrument
District, exports the second electric current to described laser instrument so that the light letter of inoperative wavelength launched by described laser instrument
Number.
Optical module the most according to claim 1, it is characterised in that also include:
Filtering assembly, it communicates, for transmission with the light output end light path of the active area of described laser instrument
The optical signal of the operation wavelength that described laser instrument is launched, and intercept the inoperative that described laser instrument is launched
The optical signal of wavelength.
Optical module the most according to claim 1 and 2, it is characterised in that described switching circuit
Unit specifically includes:
First switching circuit, its common port is as an input and first of described switch circuit units
The current output terminal of current source is connected；
Second switching circuit, its common port is as another input and of described switch circuit units
The current output terminal of two current sources is connected；
3rd switching circuit, its common port is as outfan and the described laser of described switch circuit units
The anode in Qi DBR district is connected, one contact jaw and a contact jaw phase of the first switching circuit
Even, a contact jaw of its another contact jaw and the second switching circuit is connected；And
After first and third switching circuit is used for receiving optical signal transmission signal, by the electricity of the first current source
Stream outfan is connected to the anode in the DBR district of described laser instrument；And second and third switching circuit use
After receiving optical signal stopping signal, the current output terminal of the second current source is switched described in being connected to
The anode in the DBR district of laser instrument.
Optical module the most according to claim 3, it is characterised in that also include:
Diode, another contact jaw of its anode and the first switching circuit is connected, its minus earth；
And
After first switching circuit is additionally operable to receive optical signal stopping signal, by the electric current of the first current source
Outfan is connected to the anode of described diode.
Optical module the most according to claim 3, it is characterised in that also include:
Diode, another contact jaw of its anode and the second switching circuit is connected, its minus earth；
And
Second switching circuit is additionally operable to after control receives optical signal transmission signal, by the second current source
Current output terminal is connected to the anode of described diode.
6. according to the optical module described in claim 4 or 5, it is characterised in that described diode
At least one characteristic following is identical with the characteristic in the DRB district of described laser instrument:
Resistance to properties of flow, conducting resistance, bias voltage.
7. according to the optical module described in claim 1-2, any one of 4-5, it is characterised in that also wrap
Include:
Resistance, its one end is connected with the common port of the 3rd switching circuit, its other end and described laser instrument
DBR district anode be connected, for buffering first and second electric current between switch caused electric current mistake
Punching.
8. according to the optical module described in claim 1-2, any one of 4-5, it is characterised in that also wrap
Include:
Electric capacity, its one end is connected with the common port of the 3rd switching circuit, its other end ground connection, for steady
The electric current that the anode in the DBR district of fixed described laser instrument receives.
9. the optical signal output control method of an optical module, it is characterised in that including:
After receiving optical signal transmission signal, the electric current of the first current source in described optical module is exported
End is connected to the DBR district of Distributed Bragg Reflection DBR laser in described optical module, to described
Laser instrument carries the first electric current of the first current source output so that operation wavelength launched by described laser instrument
Optical signal；
After receiving optical signal stopping signal, the electric current of the second current source in described optical module is exported
End is connected to the DBR district of described laser instrument, carries the of the second current source output to described laser instrument
Two electric currents so that the optical signal of inoperative wavelength launched by described laser instrument；
Wherein, the active area that the drive circuit in described optical module is described laser instrument provides and drives electricity
Stream.
Method the most according to claim 9, it is characterised in that also include:
The optical signal of the operation wavelength launched by laser instrument described in filtering assembly transmission, and intercept described
The optical signal of the inoperative wavelength that laser instrument is launched；
Wherein, described filtering device communicates with the light output end light path of the active area of described laser instrument.
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| CN112166535B (en) * | 2018-05-21 | 2024-01-16 | 谷歌有限责任公司 | Wavelength drift suppression for burst mode tunable EML transmitters |
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