CN106301584A - Optical module and differential electric signal output circuit - Google Patents
Optical module and differential electric signal output circuit Download PDFInfo
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- CN106301584A CN106301584A CN201510267637.1A CN201510267637A CN106301584A CN 106301584 A CN106301584 A CN 106301584A CN 201510267637 A CN201510267637 A CN 201510267637A CN 106301584 A CN106301584 A CN 106301584A
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Abstract
The invention provides a kind of optical module and differential electric signal output circuit, wherein, optical module includes: ROSA, LA, light detecting signal output circuit, and is connected across a differential electric signal outfan of LA, and the level transmission circuit between the outfan of light detecting signal output circuit；Wherein, level transmission circuit transmits to differential electric signal outfan in order to the level exported by light detecting signal output circuit.The present invention makes optical module can butt up against the communication system of PECL or CML level mode with compatibility by the method for low cost, it is ensured that the transmission quality of information between optical module and communication system.
Description
Technical field
The present invention relates to technical field of optical fiber communication, specifically, the present invention relates to a kind of optical module and
Differential electric signal output circuit circuit.
Background technology
Along with social informatization develops, occur in that cloud computing, cloud storage, HD video and three-dimensional television etc.
The business of high bandwidth requirements, PON (Passive Optical Network, EPON) connects as light
Enter system to be widely deployed.
At present, passive optical network PON specifically includes that OLT (Optical Line Terminal, light
Road terminal), the equipment such as ONU (Optical Network Unit, optical network unit)；OLT and ONU
Between generally by the OND that is made up of optical fiber and passive optical splitters (Optical Distribution Network,
Optical Distribution Network) it is attached communication, therefore, typically requiring setting in OLT and ONU can be carried out
The optical module of opto-electronic conversion.Such as, OLT optical module converts electrical signals to optical signal, passes through optical fiber
Transmit；After the optical signal of reception is converted into the signal of telecommunication by ONU optical module, output is to communication system.
In actual application, optical module specifically includes that the transmitting list for converting electrical signals to optical signal
Unit and for the optical signal of reception being converted to the reception unit of the signal of telecommunication.Wherein, as it is shown in figure 1,
Reception unit generally includes: ROSA (Receiver Optical Subassembly, light-receiving assembly) and
LA (Limiting Amplifier, amplitude limiting amplifier circuit)；And ROSA generally includes: photodiode
With TIA (Transimpedance Amplifiers, trans-impedance amplifier).Wherein, photoelectric diode can have
Body is PIN diode, or APD (Avalanche Photo Diode, avalanche photodide).So,
The optical signal detected can be converted to the signal of telecommunication by photodiode, then, the signal of telecommunication of conversion
Through the TIA in ROSA after resistance is amplified, it is input to LA；By the integration of LA, amplification, defeated
Go out differential electric signal；At the differential electric signal that LA is exported by the communication system being connected with optical module
Reason.
In early days, the internal output circuit structure used of LA, as in figure 2 it is shown, its output is PECL
(Positive Emitter-Coupled Logic, positive emitter coupling logic) output level mode；Wherein,
It is connected to the output signal of emitter follower of two outfans of differential amplifier circuit for a pair as LA
Output signal, the signal of telecommunication of this output is PECL output level mode.For ease of describing, herein
The optical module with the LA of PECL output level mode is referred to as the optical module of PECL level mode.
Along with to equipment low-power consumption, highly integrated requirement, the output circuit knot of the LA in current optical module
Structure has been carried out improving, as shown in Figure 3；Output circuit shown in Fig. 3 is CML (Current Mode
Logic, CML) output level mode, compared to the output circuit structure of Fig. 2,
Decreasing device, circuit is the simplest, thus reduces circuit power consumption, and beneficially circuit is integrated.
For ease of describing, herein the optical module with the LA of CML output level mode is referred to as CML electricity
The optical module of square formula.
But, in actual application, the optical module of CML level mode, it is sometimes desirable to butt up against original
The communication system matched with the optical module of PECL level mode；It was found by the inventors of the present invention that
After the optical module of CML level mode docks with these communication systems, often there is communication failure,
Such as, the initialization LINK of communication system connects fault, or occurs that communication is bad, system connects not
First-class problem, it is impossible to ensure the transmission quality of information.For ease of describing, herein will original and PECL
The communication system that the optical module of level mode matches is referred to as the communication system of PECL level mode, will
The communication system that original and CML level mode optical module matches is referred to as CML level mode
Communication system.
Therefore, it is necessary to the optical module providing a kind of method of low cost to make CML level mode is permissible
Compatibility butts up against the communication system of PECL or CML level mode, it is ensured that optical module and communication system
Between the transmission quality of information.
Summary of the invention
The defect existed for above-mentioned prior art, the invention provides a kind of optical module and differential electric signal
Output circuit, can make the optical module compatibility of CML level mode butt up against by the method for low cost
The communication system of PECL or CML level mode, it is ensured that the biography of information between optical module and communication system
Transmission quality.
The present invention program provides a kind of optical module, including: light-receiving assembly ROSA, limited range enlargement
Circuit LA, light detecting signal output circuit, and level transmission circuit, it is connected across described LA
A differential electric signal outfan, and between the outfan of described light detecting signal output circuit；
Described level transmission circuit is in order to the level transmission exported by described light detecting signal output circuit
To described differential electric signal outfan.
According to a further aspect in the invention, additionally provide a kind of differential electric signal output circuit, including:
Level transmission circuit, it is connected across a differential electric signal outfan of amplitude limiting amplifier circuit LA, with
Between the outfan of light detecting signal output circuit；
Described level transmission circuit is in order to the level transmission exported by described light detecting signal output circuit
To described differential electric signal outfan.
In the scheme of the present embodiment, when the LA in optical module uses CML output level mode,
At a differential electric signal outfan of LA, with the span of the outfan of light detecting signal output circuit
Connect the level transmission circuit of a low cost.So, utilize level transmission circuit that light detecting signal is defeated
Go out a level transmission differential electric signal outfan to LA of circuit output so that two of LA
There is common-mode voltage pressure reduction between differential electric signal outfan, and maintain a period of time, i.e. make CML
The differential signal of the optical module output of level mode possesses PECL output characteristics.So, optical signal is defeated
Entering initial time, the optical module of the CML level mode after present invention improvement also has common-mode voltage arteries and veins
Rush signal, can be to butt up against the communication system of PECL level mode, it is ensured that optical module and communication system
Between the transmission quality of information.And, the optical module after improvement still can butt up against CML level side
The communication system of formula.
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
Fig. 1 is the internal structure schematic diagram receiving unit in existing optical module；
Fig. 2 is the output circuit structure schematic diagram of PECL output level mode；
Fig. 3 is the output circuit structure schematic diagram of CML output level mode；
Fig. 4 is differential signal and the LOS signal schematic representation of the optical module output of PECL level mode；
Fig. 5 is differential signal and the LOS signal schematic representation of the optical module output of CML level mode；
Fig. 6 a, 6b are two kinds of optical module structure schematic diagrams of the embodiment of the present invention；
Fig. 7 is the optical module LOS signal connected mode signal with communication system of the embodiment of the present invention
Figure；
Fig. 8 is differential signal and the LOS signal schematic representation of the optical module output of the embodiment of the present invention；
Fig. 9 a-9g is respectively seven kinds of optical module internal circuit schematic diagrams that the embodiment of the present invention provides.
Detailed description of the invention
Below with reference to accompanying drawing, technical scheme is carried out clear, complete description, it is clear that
Described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are not making the premise of creative work
All other embodiments obtained by lower, broadly fall into the scope that the present invention is protected.
The present inventor inserts, according to the optical module band fibre of different output level modes, the communication powered on
During system, the differential signal that communication system is captured, to PECL output level mode, and CML
Output level mode is analyzed, and finds: as shown in Figure 4, at the initial time having optical signal to input,
There is common-mode voltage pressure reduction between the differential signal that the optical module of PECL level mode is exported, continue
After a period of time such as 10ms, it is down to zero level.And as it is shown in figure 5, there is being optical signal to input
Initial time, common-mode voltage pressure reduction between the differential signal that the optical module of CML level mode is exported
It is 0, and all keeps stable in the whole output procedure of signal.It is to say, there is being optical signal to input
Initial time, PECL level mode optical module output differential signal exist a common-mode voltage
Pulse signal, and the optical module of CML level mode output differential signal do not exist common mode electricity
The pulse signal of pressure.
Due to, when optical module band fibre inserts the communication system powered on, the communication system of PECL level mode
System, in initializing LINK connection procedure, needs the pulse signal by common-mode voltage to trigger electricity
The reception of signal, therefore, when it docks with the optical module of CML level mode, due to light
The disappearance of signal input initial time common-mode voltage pulse signal, it is impossible to trigger the reception of the signal of telecommunication, from
And cause connecting fault, the problems such as communication is bad, system does not connects.
Additionally, present inventor have further discovered that, optical module generally also includes: light detecting signal exports
Circuit.Light detecting signal output circuit is in order to detect whether optical module has light to input, and to optical module
MCU or communication system export corresponding LOS (Loss of Signal, signal loss detection indicates)
Signal alerts.In actual application, light detecting signal output circuit can use prior art many
Kind of circuit structure has detected whether that optical signal input, and such as, one circuit structure can be based on
In ROSA, the response current of photodiode (such as, APD or PIN) has detected whether optical signal
Input；Whether another kind of circuit structure can have optical signal defeated by the electrical signal detection that TIA exports
Enter.As space is limited, the internal structure of light detecting signal output circuit is the most no longer discussed in detail.Light is examined
Survey signal output apparatus, generally when judging that optical module inputs without optical signal, exports the LOS of high level
Signal；Otherwise, the LOS signal of output low level.
Based on above-mentioned analysis, the present inventor considers, it is possible to use the spy of LOS signal
Property so that LA has the output circuit of CML output level mode, PECL can be exported defeated
Go out the signal of telecommunication of level mode: in a difference telecommunications of the LA with CML output level mode
The transient state bridging a low cost number between outfan, and the outfan of light detecting signal output circuit passes
Defeated delay circuit.So, transient carrier delay circuit is utilized to be exported by light detecting signal output circuit
Level transmits a differential electric signal outfan to LA so that two differential electric signal of LA are defeated
Go out and there is common-mode voltage pressure reduction between end, and maintain a period of time, i.e. make CML level mode
The differential signal of optical module output possesses PECL output characteristics.
Due to, the differential signal of the optical module output of the CML level mode after the present invention improves
Also possessed PECL output characteristics, say, that optical signal input initial time, the present invention improves
After the optical module of CML level mode also there is common-mode voltage pulse signal, therefore, in docking
During the communication system of PECL level mode, communication system can touch according to common-mode voltage pulse signal
The reception of electrical signal, complete the initialization that LINK connects, it is ensured that between optical module and communication system
The transmission quality of information；Being additionally, since in actual application, the communication system of CML level mode is the most permissible
Butt up against the optical module of CML level mode, it is also possible to butt up against the optical module of PECL level mode,
Therefore, the optical module after the present invention improves still can be to butt up against the communication system of CML level mode.
Describe technical scheme below in conjunction with the accompanying drawings in detail.
The invention provides a kind of optical module, as shown in Fig. 6 a, 6b, including: ROSA (Receiver
Optical Subassembly, light-receiving assembly), LA (Limiting Amplifier, amplitude limiting amplifier circuit),
Light detecting signal output circuit, and transient carrier delay circuit.
Wherein, the output circuit of LA is the output circuit of CML output level mode；In actual application,
The output circuit of LA can use circuit structure as shown in Figure 3.
In actual application, transient carrier delay circuit can be built in optical module, it is also possible to is integrated in
With in the external component of optical module grafting or equipment.The transient carrier delay circuit of the present invention is with LA's
Two differential electric signal outfans, and the outfan of light detecting signal output circuit, constitute differential electrical
Signal output apparatus.
It is true that LA has a pair differential signal outputs, such as, shown in Fig. 6 a, 6b
Rx_OUT+ end and Rx_OUT-end；And transient carrier delay circuit can be with the Rx_OUT+ end of LA
It is connected, or is connected with the Rx_OUT-end of LA.For ease of describe, herein by LA with transient state
The differential electric signal outfan that transmission delay circuit is connected is referred to as the first differential electric signal outfan；Will
In LA, another differential electric signal outfan is referred to as the second differential electric signal outfan.
Additionally, the differential electric signal outfan Rx_OUT+ end of LA and the difference of Rx_OUT-end output
Signal can be by capacitive transmission to communication system.In actual application, this electric capacity can be arranged at optical mode
Block side, or it is arranged at communication system side；When electric capacity is arranged at optical module side, be referred to Fig. 6 a,
In 6b, the position of the electric capacity of two differential signal outputs of LA is configured:
A kind of set-up mode is: the electric capacity on the first differential electric signal outfan is arranged at circuit connection point
And between LA device, as shown in Figure 6 b；Wherein, circuit connection point refers specifically to the first difference
Electrical signal and the junction point of transient carrier delay circuit.
Another kind of set-up mode is: the electric capacity on the first differential electric signal outfan is arranged at circuit and connects
Between point and communication system, as shown in Figure 6 a.
Wherein, transient carrier delay circuit specifically includes: the differential electric signal being connected across LA is defeated
Go out end, and the level transmission circuit between the outfan of light detecting signal output circuit.
In the inventive solutions, level transmission circuit is in order to by defeated for light detecting signal output circuit
The level gone out transmits the first differential electric signal outfan to LA.
In the embodiment of the present invention, the outfan of light detecting signal output circuit receives light letter at ROSA
Number time output low level, when ROSA is not received by optical signal export high level.
In actual application, can adopt between light detecting signal output circuit and the communication system in optical module
LOS signal connection is carried out with the electric connecting mode shown in Fig. 7；Wherein, the LOS of communication system
Signal receiving end is connected with power supply by a pull-up resistor, in order to light detecting signal output circuit
Outfan connects, and receives the LOS signal of light detecting signal output circuit output.So, at optical mode
Before block is undocked with communication system, the LOS signal receiving end of communication system will be high level always.
In the case of optical module is charged, if optical module has optical signal to input always, then light detecting signal
Output circuit is by the LOS signal of output low level；If optical module does not has optical signal to input, then light
Detection signal output apparatus is by the LOS signal of output high level；And when the optical mode having optical signal to input
The moment that block docks with communication system, due to pulling up by the LOS signal receiving end of communication system
The impact of resistance, LOS signal will be high level by moment pull-up, and at a period of time (such as 10us)
Rear circuit stability falls back to low level after getting off again.And when do not have optical module that optical signal input and
During communication system docking, due to the shadow of the pull-up resistor of the LOS signal receiving end by communication system
Ring, and the LOS pull-up within optical module, LOS signal will be high level by moment pull-up, and begin
Keep high level state eventually.
Therefore, no matter whether optical module has optical signal to input, when communication system docks with optical module
Carve and the situation that LOS signal is high level all can occur；So, the high level of LOS signal is by electricity
Flat transmission circuit, can transmit the first differential electric signal outfan to LA.
When inputting without optical signal, the signal of telecommunication input that the input of LA is not changed by optical signal,
Therefore, two differential electric signal outfans of LA now do not have differential signal to export.
And when optical module has optical signal to input, will there is the electricity changed by optical signal in the input of LA
Signal inputs, and the differential electric signal outfan of LA will export differential signal, meanwhile, light detecting signal
The LOS signal of the outfan output of output circuit is low level by high level saltus step；Then, pass through
The level that light detecting signal output circuit is exported by level transmission circuit transmits the first differential electrical to LA
Signal output part.
Owing to signal transmission often has certain delay, therefore, the first differential electric signal output of LA
End will not be affected by the level of the outfan of light detecting signal output circuit and directly be jumped at once
Low level, but gradually reduce to low level.So, the outfan of light detecting signal output circuit with
Common mode voltage difference between the first differential electric signal outfan of LA will maintain a period of time, then,
The common-mode voltage pressure reduction between two differential electric signal outfans of LA is made to maintain a period of time, i.e.
Make improved after CML level mode optical module output differential signal there is pulse signal,
Possesses PECL output characteristics.So, PECL output electricity can be exported due to the optical module of the present invention
The signal of telecommunication of square formula, therefore, it can dock with the communication system of PECL level mode.
In actual application, due to the difference of two differential electric signal outfan outputs of LA in optical module
Signal generally can be coupled in the communication system docked with this optical module by two capacitances.Cause
This, have, at optical module, the initial time that optical signal inputs, the first differential electric signal outfan of LA by
High level is changed to low level process and will be delivered to the input of communication system by Capacitance Coupled effect
End；Thus, when optical module band fibre inserts the communication system powered on, communication system inputs at optical signal
Initial time, can capture and maintain a period of time, there is the differential electric signal of common-mode voltage pressure reduction,
As shown in Figure 8, with this trigger communication system the signal of telecommunication reception, complete communication system LINK even
The initialization connect, it is ensured that the transmission quality of information between optical module and communication system.
It is true that the communication system in view of CML level mode is generally free from PECL output level
The impact of the signal of telecommunication of mode, say, that the communication system of CML level mode both can butt up against
The optical module of CML level mode, it is also possible to butt up against the optical module of PECL level mode；Therefore, originally
The optical module of invention both can be to have butted up against the communication system of PECL level mode, it is also possible to butts up against
The communication system of CML level mode, improves the compatibility of optical module.
In actual application, as illustrated in fig. 9, the level transmission circuit in the embodiment of the present invention can wrap
Include: inductance L1.When inputting without optical signal, the LOS signal of high level is transmitted by inductance L1
To the first differential electric signal outfan of LA, by the first differential electric signal outfan pull-up of LA it is
High level；When optical module has optical signal to input, the LOS signal saltus step of high level is low level
LOS signal, owing to inductance L1 has the characteristic of logical direct current resistance exchange, low level LOS signal will
Continuity a period of time transmits the first differential electric signal outfan to LA, so that the difference of LA
Common-mode voltage pressure reduction between electrical signal continues for some time.Those skilled in the art can root
The value of border circuit conditions design inductance L1 factually.
Or, as shown in figure 9b, the level transmission circuit in the embodiment of the present invention may include that electricity
Resistance R1.
Wherein, resistance R1 is connected across a differential electric signal outfan of LA, with light detecting signal
Between the outfan of output circuit, transmit extremely in order to the level that light detecting signal output circuit is exported
The first differential electric signal outfan of LA.
In actual application, when inputting without optical signal, R1 can be by defeated for light detecting signal output circuit
The high level gone out transmits the first differential electric signal outfan to LA so that first differential electrical of LA
Signal output part pull-up is high level.Afterwards, when optical module has optical signal to input, R1 can be by
The low level of light detecting signal output circuit output transmits the first differential electric signal outfan to LA；
Owing to signal transmission often has certain delay, therefore, the first differential electric signal outfan of LA
Level will gradually be dragged down, i.e. common-mode voltage pressure reduction between the differential electric signal outfan of LA continues
A period of time.So, the optical module of the CML level mode that the present invention is improved can export PECL
The signal of telecommunication of output level mode, can be to butt up against the communication system of PECL level mode.
More preferably, in the embodiment of the present invention, transient carrier delay circuit can further include: pressure
Difference holding circuit.
Wherein, pressure reduction holding circuit is connected across the first differential electric signal outfan of LA, detects with light
Between the outfan of signal output apparatus, in order to the level of the outfan at light detecting signal output circuit
After saltus step so that the outfan of light detecting signal output circuit exports with first differential electric signal of LA
Common mode voltage difference between end, maintains preset time period, and two differential electric signal i.e. making LA are defeated
Go out the common mode voltage difference between end and maintain preset time period, with the differential signal of this broadening optical module output
In pulse signal, facilitate docking of optical module and communication system.
Specifically, as is shown in fig. 9 c, pressure reduction holding circuit may include that and is connected across of LA
The resistance R2 connected between differential electric signal outfan, and the outfan of light detecting signal output circuit
With electric capacity C1.
After having optical signal input, the outfan of light detecting signal output circuit and first difference of LA
The preset time period that between electrical signal, common mode voltage difference maintains can be by pressure reduction holding circuit
The resistance of resistance R2, and the capacitance of electric capacity C1 determines.It is to say, maintained by pressure reduction
The resistance of R2 or the capacitance of electric capacity C1 in circuit, can regulate the differential signal that communication system receives
The width (i.e. the time of common-mode voltage pulse persistance) of common-mode voltage pulse.Additionally, by choosing
The resistance of the suitable resistance R2 in pressure reduction holding circuit, it is also possible to be effectively prevented from optical module output
Differential signal run off along light detecting signal output circuit, it is ensured that the transmission matter of information of optical module output
Amount.Such as, arrange resistance R2 to examine along light with the differential signal avoiding optical module to export more than 100 Ω
Survey signal output apparatus runs off.Capacitance is passed through in the output of the first differential electric signal outfan of LA
When being coupled to the input of communication system, a difference telecommunications with common-mode voltage pulse can occur
Number；And the amplitude of common-mode voltage pulse can be adjusted by the resistance changing R1.
Or, as shown in figure 9d, pressure reduction holding circuit may include that the difference being connected across LA
Divide the inductance L2 between electrical signal, and the outfan of light detecting signal output circuit.Utilize
The logical direct current resistance AC characteristic of inductance L2, when LOS signal is become low level from high level, LA
Differential electric signal outfan between common-mode voltage pressure reduction continue for some time.Wherein, common-mode voltage
The preset time period that difference maintains can be determined by the sensibility reciprocal of the inductance L2 in pressure reduction holding circuit.
Or, as shown in figure 9e, pressure reduction holding circuit may include that the difference being connected across LA
The resistance R3 that point connects between electrical signal, and the outfan of light detecting signal output circuit,
Electric capacity C2 and inductance L3.Wherein, the preset time period that common mode voltage difference maintains can be maintained by pressure reduction
The sensibility reciprocal of the resistance of resistance R3, the capacitance of electric capacity C2 and inductance L3 in circuit determines.
Or, as shown in figure 9f, pressure reduction holding circuit may include that the difference being connected across LA
The inductance L4 connected between electrical signal, and the outfan of light detecting signal output circuit and electricity
Resistance R4.Wherein, the preset time period that common mode voltage difference maintains can be by the electricity in pressure reduction holding circuit
The sensibility reciprocal of sense L4 and the resistance of resistance R4 determine.
Or, as shown in figure 9g, pressure reduction holding circuit may include that the difference being connected across LA
Point electrical signal, the inductance L5 in parallel with between the outfan of light detecting signal output circuit and
Electric capacity C3.Wherein, the preset time period that common mode voltage difference maintains can be by pressure reduction holding circuit
The sensibility reciprocal of inductance L5 and the capacitance of electric capacity C3 determine.
Those skilled in the art can design above-mentioned resistance R1-R4, electric capacity according to side circuit situation
C1-C3, and the value of inductance L1-L5.For example, it is possible to arrange R1 more than 100 Ω less than 500 Ω,
The preset time period that common mode voltage difference as requested maintains, such as 10ms, according to RC integrating circuit
Delay time design drawing 9c shown in R2, C1 value in circuit.
In technical scheme, by a differential electrical of the LA in CML output level mode
The transient state of a low cost is bridged between signal output part, and the outfan of light detecting signal output circuit
Transmission delay circuit so that have the initial time that optical signal inputs, two differential electric signal of LA are defeated
Go out and between end, there is a common-mode voltage pressure reduction, and after continuing for some time, be down to zero level, even if
The differential signal of the optical module output obtaining CML level mode possesses PECL output characteristics.So,
The optical module of CML level mode just can be enable at lower cost to butt up against PECL level mode
Communication system, it is ensured that the transmission quality of information between optical module and communication system；It is to say, the present invention
Optical module can with compatibility docking PECL or CML level mode communication system.
Owing to the transient carrier delay circuit of the present invention increase only inductance, or resistance, capacitor element,
Therefore, it can meet and equipment is reduced cost, low-power consumption, highly integrated requirement.
The term such as " module " used in this application, " system " is intended to include the entity relevant to computer,
Such as but not limited to hardware, firmware, combination thereof, software or executory software.Such as, mould
Block it may be that it is not limited to: on processor run process, processor, object, journey can be performed
Sequence, the thread of execution, program and/or computer.For example, application program calculating equipment run
Can be module with this calculating equipment.One or more modules may be located at an executory process and/
Or in thread, a module can also be positioned on a computer and/or be distributed in two or the calculating of more multiple stage
Between machine.
Those skilled in the art of the present technique are appreciated that the present invention includes relating to performing described herein
One or more equipment in operation.These equipment can be required purpose and specialized designs and manufacture,
Or the known device in general purpose computer can also be included.These equipment have storage calculating within it
Machine program, these computer programs optionally activate or reconstruct.Such computer program can be deposited
Store up in equipment (such as, computer) computer-readable recording medium or be stored in and be suitable to store e-command difference
Being coupled in any kind of medium of bus, described computer-readable medium includes but not limited to any class
The dish (including floppy disk, hard disk, CD, CD-ROM and magneto-optic disk) of type, ROM (Read-Only
Memory, read only memory), RAM (Random Access Memory, memorizer immediately), EPROM
(Erasable Programmable Read-Only Memory, Erarable Programmable Read only Memory),
(Electrically Erasable Programmable Read-Only Memory, electrically erasable can for EEPROM
Program read-only memory), flash memory, magnetic card or light card.It is, computer-readable recording medium includes by setting
Standby (such as, computer) is with the form storage that can read or any medium of transmission information.
Those skilled in the art of the present technique are appreciated that and can realize these structures with computer program instructions
In each frame in figure and/or block diagram and/or flow graph and these structure charts and/or block diagram and/or flow graph
The combination of frame.Those skilled in the art of the present technique are appreciated that can be provided these computer program instructions
Realize to the processor of general purpose computer, special purpose computer or other programmable data processing methods, from
And perform structure disclosed by the invention by the processor of computer or other programmable data processing methods
The scheme specified in figure and/or block diagram and/or the frame of flow graph or multiple frame.
Those skilled in the art of the present technique be appreciated that the present invention had discussed various operations, method,
Step in flow process, measure, scheme can be replaced, changed, combined or deleted.Further, tool
There are the various operations discussed in the present invention, method, other steps in flow process, measure, scheme
Can also be replaced, changed, reset, decomposed, combined or deleted.Further, of the prior art
Have with the step in the various operations disclosed in the present invention, method, flow process, measure, scheme can also
Replaced, changed, reset, decomposed, combined or deleted.
The above is only the preferred embodiment of the present invention, it is noted that general for the art
For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. an optical module, including: light-receiving assembly ROSA, amplitude limiting amplifier circuit LA, light are examined
Surveying signal output apparatus, it is characterised in that also include: level transmission circuit, it is connected across described
One differential electric signal outfan of LA, and between the outfan of described light detecting signal output circuit；
Described level transmission circuit is in order to the level transmission exported by described light detecting signal output circuit
To described differential electric signal outfan.
2. optical module as claimed in claim 1, it is characterised in that described level transmission circuit has
Body includes: resistance；Or
Described level transmission circuit specifically includes: inductance.
3. optical module as claimed in claim 2, it is characterised in that also include: pressure reduction maintains electricity
Road, it is connected across a differential electric signal outfan of described LA, exports with described light detecting signal
Between the outfan of circuit；
Described pressure reduction holding circuit is in order to the level of the outfan at described light detecting signal output circuit
After saltus step so that the outfan of described light detecting signal output circuit and described differential electric signal outfan
Between common mode voltage difference, maintain preset time period.
4. optical module as claimed in claim 3, it is characterised in that described pressure reduction holding circuit has
Body includes: the resistance of series connection and electric capacity；Or
Described pressure reduction holding circuit specifically includes: inductance；Or
Described pressure reduction holding circuit specifically includes: the resistance of series connection, electric capacity and inductance；Or
Described pressure reduction holding circuit specifically includes: the inductance of series connection and resistance；Or
Described pressure reduction holding circuit specifically includes: inductance in parallel and electric capacity.
5. the optical module as described in claim 1-4 is arbitrary, it is characterised in that described light detecting signal
Output circuit is output low level when described ROSA receives optical signal, does not has at described ROSA
Output high level when receiving optical signal.
6. the optical module as described in claim 1-4 is arbitrary, it is characterised in that the output of described LA
Circuit is the output circuit of CML output level mode；And
The differential electric signal outfan of described LA is connected to communication system by electric capacity.
7. a differential electric signal output circuit, including: level transmission circuit, it is connected across amplitude limit
One differential electric signal outfan of amplifying circuit LA, with the outfan of light detecting signal output circuit
Between；
Described level transmission circuit is in order to the level transmission exported by described light detecting signal output circuit
To described differential electric signal outfan.
8. circuit as claimed in claim 7, it is characterised in that described level transmission circuit is concrete
Including: resistance；Or
Described level transmission circuit specifically includes: inductance.
9. circuit as claimed in claim 8, it is characterised in that also include: pressure reduction holding circuit,
It is connected across a differential electric signal outfan of described LA, with described light detecting signal output circuit
Outfan between；
Described pressure reduction holding circuit is in order to the level of the outfan at described light detecting signal output circuit
After saltus step so that the outfan of described light detecting signal output circuit and described differential electric signal outfan
Between common mode voltage difference, maintain preset time period.
10. circuit as claimed in claim 9, it is characterised in that described pressure reduction holding circuit is concrete
Including: the resistance of series connection and electric capacity；Or
Described pressure reduction holding circuit specifically includes: inductance；Or
Described pressure reduction holding circuit specifically includes: the resistance of series connection, electric capacity and inductance；Or
Described pressure reduction holding circuit specifically includes: the inductance of series connection and resistance；Or
Described pressure reduction holding circuit specifically includes: inductance in parallel and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510267637.1A CN106301584B (en) | 2015-05-22 | 2015-05-22 | Optical module and differential electric signal output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510267637.1A CN106301584B (en) | 2015-05-22 | 2015-05-22 | Optical module and differential electric signal output circuit |
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| Publication Number | Publication Date |
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| CN106301584A true CN106301584A (en) | 2017-01-04 |
| CN106301584B CN106301584B (en) | 2018-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510267637.1A Active CN106301584B (en) | 2015-05-22 | 2015-05-22 | Optical module and differential electric signal output circuit |
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| CN109067471A (en) * | 2018-08-31 | 2018-12-21 | 湖南率为控制科技有限公司 | Light-receiving integrating device |
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| CN109067471A (en) * | 2018-08-31 | 2018-12-21 | 湖南率为控制科技有限公司 | Light-receiving integrating device |
| CN114285475A (en) * | 2020-09-27 | 2022-04-05 | 青岛海信宽带多媒体技术有限公司 | an optical module |
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|---|---|
| CN106301584B (en) | 2018-10-23 |
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