CN106100723B - A kind of optical module - Google Patents

A kind of optical module Download PDF

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Publication number
CN106100723B
CN106100723B CN201610494556.XA CN201610494556A CN106100723B CN 106100723 B CN106100723 B CN 106100723B CN 201610494556 A CN201610494556 A CN 201610494556A CN 106100723 B CN106100723 B CN 106100723B
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Prior art keywords
input terminal
switch
signal
optical
coupled capacitor
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CN201610494556.XA
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Chinese (zh)
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CN106100723A (en
Inventor
张强
赵其圣
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
    • H04B10/0731—Testing or characterisation of optical devices, e.g. amplifiers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4274—Electrical aspects
    • G02B6/4278—Electrical aspects related to pluggable or demountable opto-electronic or electronic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4285—Optical modules characterised by a connectorised pigtail
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

Abstract

The present invention provides a kind of optical module, belongs to optical communication field.Optical module provided in an embodiment of the present invention includes optical detector, mirror image circuit, comparator, trigger, impulse generator, switch, resistance, coupled capacitor and limiting amplifier, optical detector is connected with the input terminal of mirror image circuit, the output end of mirror image circuit is connected with the first input end of one end of coupled capacitor and comparator respectively, second input terminal of comparator connects reference voltage, the output end of comparator is connected with the input terminal of trigger, the output end of trigger is connected with impulse generator, impulse generator is connected with switch control terminal, the first input end of switch is connected with the reference signal input terminal of limiting amplifier, the second output terminal of switch is connected with one end of resistance, the other end of resistance is connected with the input terminal of limiting amplifier, the third input terminal of switch is connected with the other end of coupled capacitor, the other end of coupled capacitor is also It is connected with the input terminal of limiting amplifier, realizes coupled capacitor repid discharge.

Description

A kind of optical module
Technical field
The present embodiments relate to optical communication field more particularly to a kind of optical modules.
Background technique
PON(Passive Optical Network, passive optical-fiber network), refer in OLT(Optical Line Terminal, optical line terminal) and ONU(Optical Network Unit, optical network unit) between be ODN(Optical Distribution Network, Optical Distribution Network), without any active electronic devices.Therefore, with active light access technology phase Than, PON due to eliminating the active equipment between local side and user terminal, so that maintenance is simple, high reliablity, at low cost, And fiber resource can be saved, be the following FTTH(Fiber To The Home, fiber to the home) primary solutions.In nothing In the optical-fiber network of source, generalling use time-multiplexed mode realizes point-to-multipoint topological structure.For example, being received in OLT optical module To the optical signal sent from different ONU optical modules.
It is according to IEEE respectively currently, there is the passive optical-fiber network OLT optical module of two very much not same types on the market (Institute of Electrical and Electronics Engineers, American Institute of Electrical and Electronics Engineers) The EPON(Ethernet Passive Optical Network of protocol definition, Ethernet passive optical network) OLT optical module and According to the GPON(Gigabit-Capable PON that International Telecommunication Union (ITU-T) defines, gigabit passive optical network) OLT light Module.
In practical application, either in EPON or GPON, the core of physical layer optical fiber transmission is that uplink linght is prominent The transmission of hair mode and downlink broadcast transmission.It dashes forward for example, user terminal ONU optical module sends light to OLT optical module with optical burst-mode It signals.In this way, the ROSA(Receiver Optical Subassembly in OLT optical module, light-receiving component) it receives Up to after time uncertain uplink optical burst signal, OLT optical module is transmitted to after optical burst signal can be converted to electric signal In burst receiver circuit, the LA(Limiting Amplifier in burst receiver circuit, amplitude limiting amplifier circuit) to electricity Signal carries out limited range enlargement processing, then exports amplified signal, in the system that is connect with OLT optical module by electrical interface Other modules use.
In general, being carried out between LA in the ROSA in OLT optical module and burst receiver circuit using AC coupled mode Signal transmission；For example, bridging a coupled capacitor between ROSA and burst receiver circuit.In practical application, ONU optical module Optical signal interval for burst transmissions, i.e. ONU optical module transmission is shorter；After an optical burst signal reaches, in OLT optical module Coupled capacitor between ROSA and burst receiver circuit can have the dynamic process of charging, electric discharge.Since coupled capacitor has The characteristic of separated by direct communication, therefore, in order to receive next optical burst signal, coupled capacitor needs are arrived in next optical burst signal Up to being restored to static state before.And the velocity of discharge of coupled capacitor itself is slow, in this way, making the reception of next optical burst signal Time is longer, i.e., so that the burst reception signaling protein14-3-3 of burst receiver circuit is slack-off, to cause system bandwidth Utilization rate reduces.
Summary of the invention
The embodiment of the present invention provides a kind of optical module, can be realized the repid discharge of coupled capacitor.
In order to achieve the above-mentioned object of the invention, the embodiment of the present invention adopts the following technical scheme that
The embodiment of the present invention provides a kind of optical module, including optical detector, mirror image circuit, comparator, trigger, pulse life It grows up to be a useful person, switch, resistance, coupled capacitor and limiting amplifier, the optical detector are connected with the input terminal of the mirror image circuit, institute The output end for stating mirror image circuit is connected with the first input end of one end of the coupled capacitor and the comparator respectively, the ratio The second input terminal compared with device connects reference voltage, and the output end of the comparator is connected with the input terminal of trigger, the triggering The output end of device is connected with the impulse generator, and the impulse generator is connected with the switch control terminal, the switch First input end is connected with the reference signal input terminal of the limiting amplifier, the second output terminal of the switch and the resistance One end be connected, the other end of the resistance is connected with the input terminal of the limiting amplifier, the third input terminal of the switch Be connected with the other end of the coupled capacitor, the other end of the coupled capacitor also with the input terminal phase of the limiting amplifier Even,
Under the control of switch control terminal, realize switch first input end respectively with the conducting of the second input terminal of switch or with Switch the conducting of third input terminal.
The light received is converted to electric signal by optical detector, and electric signal is inputted mirror image circuit, mirror image electricity by optical detector Road is to generating image current after the electric signal image copying of input, wherein all the way in mirror image circuit input coupling capacitor, wherein separately The first input end of mirror image circuit input comparator all the way, the second input terminal input reference voltage of comparator, comparator it is defeated Outlet is connected with the input terminal of trigger, and comparator is compared reference voltage with the voltage from mirror image circuit, will compare The input terminal of the result voltage input trigger obtained afterwards, trigger generate trigger voltage, pulse according to the jump of result voltage Generator generates pulse signal according to trigger voltage, and switch control terminal realizes that switch first inputs under the control of pulse signal Conducting or realization switch first input end and the conducting that switchs second output terminal of the end with the second input terminal of switch, it is defeated by first Enter the end conducting relationship different from the second input terminal or output end, realize the short circuit relationship at the both ends of coupled capacitor, thus real Now to the charge and discharge of coupled capacitor.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.
Fig. 1 is optical module structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is that optical module provided in an embodiment of the present invention runs timing diagram；
Fig. 3 is another optical module structure schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Clear, complete description is carried out to technical solution of the present invention below with reference to attached drawing, it is clear that described implementation Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff obtained all other embodiment without making creative work belongs to the present invention and is protected The range of shield.
The present inventor is it is considered that in existing PON networking structure, positioned at the optical network unit OLT of local side and position It is communicated between the optical network unit ONU of user terminal using burst mode.Receiving end under burst mode, in optical module The light received be it is discontinuous, i.e. the receiving end of optical module can receive light sometimes, can not receive light sometimes, there is light shape State is compared with no light condition, and the electrical signal intensity of the optical detector output of optical module has obvious difference, by this difference Not She Zhi decision threshold, the differentiation to having light state and no light condition can be realized, to be formed with light state and no light condition Between timing, this timing can be used as reset signal reset.
Fig. 1 is optical module structure schematic diagram provided in an embodiment of the present invention.As shown in Figure 1, provided in an embodiment of the present invention Optical module includes including optical detector T, mirror image circuit current mirror, comparator compare, trigger D-filp, arteries and veins Rush generator Pulse Generate, switch S, resistance R, coupled capacitor C and limiting amplifier limiting Amplifier, institute Optical detector is stated to be connected with the input terminal of the mirror image circuit, the output end of the mirror image circuit respectively with the coupled capacitor The first input end of one end and the comparator is connected, and the second input terminal of the comparator connects reference voltage vref, described The output end of comparator is connected with the input terminal of trigger, and the output end of the trigger is connected with the impulse generator, institute It states impulse generator to be connected with the switch control terminal, the reference of the first input end of the switch and the limiting amplifier is believed Number input terminal is connected, and the second output terminal of the switch is connected with one end of the resistance, the other end of the resistance with it is described The input terminal of limiting amplifier is connected, and the third input terminal of the switch is connected with the other end of the coupled capacitor, the coupling The other end for closing capacitor is also connected with the input terminal of the limiting amplifier,
Under the control of switch control terminal, switch first input end is realized and the second input terminal of switch or switch third respectively The conducting of input terminal.
Optical detector T receives light light, the light received is converted to electric signal, electric signal is inputted mirror by optical detector As circuit, mirror image circuit is to image current is generated after the electric signal image copying of input, wherein mirror image circuit input coupling all the way In capacitor, wherein the first input end of another way mirror image circuit input comparator, the second input terminal input reference of comparator are electric Pressure, the output end of comparator is connected with the input terminal of trigger, comparator to reference voltage and the voltage from mirror image circuit into Row compares, and by the input terminal of the result voltage input trigger obtained more afterwards, trigger is generated according to the jump of result voltage Trigger voltage, impulse generator generate pulse signal according to trigger voltage, and switch control terminal is realized under the control of pulse signal Conducting or realization switch first input end and switch second output terminal of the switch first input end with the second input terminal of switch are led It is logical.
It include light-receiving chip and trans-impedance amplifier in optical detector in the receiving end of optical module, light-receiving chip will be by The photoelectric current of light conversion inputs trans-impedance amplifier, and photoelectric current is converted to photovoltage by trans-impedance amplifier, due to trans-impedance amplifier with The quiescent point of limiting amplifier is often different, and the connection between trans-impedance amplifier and limiting amplifier is needed to couple electricity Hold, to realize electrical level match.During electrical level match, coupled capacitor will realize the cyclic process of charge and discharge, however coupling It is slower to close the capacitor velocity of discharge, quick electrical level match can not be established between trans-impedance amplifier and limiting amplifier.
Since coupled capacitor has the characteristic of separated by direct communication, in order to receive next optical burst signal, coupled capacitor It needs to be restored to static state before next optical burst signal reaches.And since the velocity of discharge of coupled capacitor itself is slow, this Sample, so that the reception time of next optical burst signal is longer, so that the burst reception signal of burst receiver circuit Restore slack-off, so that causing the utilization rate of system bandwidth reduces.
Therefore, real in order to shorten reception time of the LA to optical burst signal of burst receiver circuit in optical module The fast quick-recovery of the burst reception signal of existing burst receiver circuit, needs to discharge to coupled capacitor in time, so that coupling Static state can be quickly recovered to before the arrival of next optical burst signal by closing capacitor, be carried out to receive next optical burst signal Prepare.
Under the scene of no systematic reset signal (reset), by the variation of itself response current of optical module receiving end, Trigger pulse generator is removed, generates and resets Reset signal, accelerates the reception settling time of EPON OLT optical module, to reduce Overhead, lifting system handling capacity.Meanwhile optical module goes relatively using the response current of receiving end and triggers reset signal, Can be happened suddenly light packet with real-time response, accomplished quickly to generate reset signal, compared with being used as triggering timing using LOS signal, be reduced Signal passes through the delay of limiting amplifier judgement.
The characteristic that can use light detecting signal, after the ROSA in optical module receives optical signal, electric current according to response Variation, generate reset signal in time.
In this way, after optical signal reaches, the discharge circuit that is connected with reset signal output circuit output end can be with It is discharged in time according to coupled capacitor of the reset signal to the input terminal for being set to limiting amplifier, shortens next optical signal Reception time, to realize the fast quick-recovery of burst reception signal.It is realized compared to existing by additional reset signal The fast quick-recovery of burst reception signal, the present invention by the light detecting signal output end of limiting amplifier have optical signal input and The jump of level triggers the technical solution for generating reset signal when no optical signal inputs, and system design is simpler, reduce and be System complexity.
In EPON network, system end does not provide reset signal to the receiving end of optical module, and optical module receiving end can not Learn accurate reset timing.
Optical module provided in an embodiment of the present invention is compared, by touching by the electric signal that comparator converts optical detector It sends out device and control sequential is generated according to comparison result, pulse signal is generated according to control sequential by impulse generator, by pulse signal Coupled capacitor repid discharge is controlled as reset signal.
Specifically, trans-impedance amplifier output is differential signal, and a coupled capacitor is connected on per differential signal all the way, And then two-way discharge circuit is needed to be connected respectively with two coupled capacitors.
The input with the input terminal of the mirror image circuit and the trans-impedance amplifier respectively of the output end of the optical receiver End is connected, the output end output light electric current of optical receiver；
First output end of trans-impedance amplifier is connected with one end of first capacitor, the second output terminal of trans-impedance amplifier and the One end of two capacitors is connected, and trans-impedance amplifier provides difference photovoltage to first capacitor and the second capacitor；
One end of first resistor is connected with the first input end of the output end of mirror image circuit and comparator respectively, first resistor Other end ground connection, the second input terminal of comparator is connected with reference voltage source, the output end of comparator and one end of trigger Be connected, the output end of trigger is connected with the input terminal of pulser, the output end of pulser respectively with the input terminal of first switch It is connected with the input terminal of second switch, the first output end of first switch is connected with one end of second resistance, and the of second switch Two output ends are connected with one end of 3rd resistor, and pulser provides pulse voltage, first switch to first switch and second switch Second output terminal of the input terminal under the control of pulse voltage respectively with the first output end of first switch and first switch lead It is logical；The input terminal of second switch under the control of pulse voltage respectively with the first output end of second switch and second switch The conducting of two output ends；
The other end of first capacitor is connected with the other end of the second output terminal of first switch and second resistance respectively,
The other end of second capacitor is connected with the other end of the second output terminal of second switch and 3rd resistor respectively,
The first input end of limiting amplifier respectively with the other end of second resistance, the second output terminal of first switch and The other end of one capacitor is connected；
Second input terminal of limiting amplifier respectively with the other end of 3rd resistor, the second output terminal of second switch and The other end of two capacitors is connected.
Fig. 2 is that optical module provided in an embodiment of the present invention runs timing diagram.It is simulated in optic communication using the Strength Changes of light The Strength Changes of electricity, so optical signal is that signal condition is different from electric signal, the data of carrying are identical.
In Fig. 2, optical signal is the optical signal received, and the part preamble is first leading code in optical signal, no Comprising valid data, and the part data just includes valid data.
Compare output is the electric signal of comparator output, and as shown in Figure 2, comparator exports the variation of electric signal slightly The variation of delay and optical signal, due to there is first leading code in optical signal, so the delay variation of comparator output electric signal will not Influence the reception of valid data.
Rest is the reset signal that optical module of the invention that provide of having a try generates, under the triggering of reset signal, switch Conducting relationship changes, specifically, the conducting of the second input terminal and third input terminal of the first input end and switch of switch Relationship changes, so that coupled capacitor realizes the switching of charge discharge state.
RX data is the electric signal that optical module eventually receives, and reset signal is the discharge time that coupled capacitor generates, It completes the moment prior to the arrival time of valid data in optical signal, ensure that from the time and connects to comprising effective data light It receives.
As shown in Fig. 2, the optical signal optical signal that optical module receives includes lead code PREAMBLE and data DATA, since the device of optical detector rear end has delay to the Electric signal processing from optical detector, so part can be lost Lead code.
For optical detector, it is real-time for receiving optical signal.At the t0 moment, optical detector receives optical signal, Optical signal unanimously continues to that the t4 moment terminates, and receives the time of optical signal, at the t6 moment, optical detection for optical detector from t0 to t4 What device received is data-signal, this needs coupled capacitor to complete electric discharge between the t6 moment, according to new since the t6 moment Signal charges, to complete the electrical level match between trans-impedance amplifier and limiting amplifier.
In the electric signal input comparator that mirror image circuit converts optical detector, comparator is in its output letter of t1 time changing Number.So that trigger issues trigger signal, the trigger signal of trigger makes impulse generator for the change of comparator output signal Generate pulse signal, under the action of pulse signal, coupled capacitor realize repid discharge, the t3 moment enter recharge process into Row working condition realizes the output for receiving signal RX DATA.Receiving signal is the electric signal in input saturation amplifier.
The first input end of comparator accesses the signal from mirror image circuit, and the second input terminal access of comparator is with reference to letter Number, the electric signal of first input end is compared by comparator with the electric signal of the second input terminal, exports comparison signal in real time compare output.Specifically, when the electrical signal intensity of first input end is higher than the electrical signal intensity of the second input terminal, than Comparison signal compared with device output is high level；When the electrical signal intensity of first input end is lower than the electrical signal intensity of the second input terminal When, the comparison signal of comparator output is low level.Since first input end and the second input terminal persistently have electric signal input, institute There is lasting comparison signal output with comparator.
As shown in Fig. 2, before time tl, the comparison signal compare output output of comparator is high level, right Optical detector is answered to be not received by optical signal；Jumping at the t1 moment is low level, and corresponding optical detector receives optical signal, to light It is t0 at the time of receiving optical signal for detector, since comparator processing has delay, t1 is less than t0；It is jumped at the t5 moment Become high level, corresponding optical detector does not receive optical signal, for optical detector, is at the time of not receiving optical signal T4, since comparator processing has delay, t5 is less than t4.
The comparison result of comparator is the voltage signal of height variation, and there are two the voltage signal tools of one end height variation Edge, one is high voltage variable low pressure, and one is that low pressure gets higher pressure, by the setting to comparator, makes comparator selection wherein one The variation at a edge exports trigger signal, and two edges, which export trigger signal, can upset subsequent time sequencing.
The signal of trigger output is lasting, and coupled capacitor is discharged by way of being shorted signal wire, so cannot Using lasting signal, impulse generator generates pulse signal reset according to the signal that trigger exports, and pulse signal is lasting Time is shorter, and in a short time, coupled capacitor discharges electricity by way of being shorted signal wire, after pulse signal ends, coupling It closes capacitor and restores normal connection, charge.
As shown in Fig. 2, the pulse signal RESET that impulse generator generates is triggered at the t2 moment, terminate at the t2 ' moment, T2 ' is less than t3, stops in t2 ' moment pulse signal, as a result, at the t3 moment, coupled capacitor enters the discharge process of coupled capacitor Charging process carries out data receiver.
The first input end of switch is connect with one end of the reference end of limiting amplifier and resistance respectively, and the second of switch is defeated Enter end to connect with the other end of the other end of resistance and coupled capacitor respectively, one end of coupled capacitor connects trans-impedance amplifier, coupling The input terminal of the other end and limiting amplifier that close capacitor connects.The output of the control terminal connection pulse signal generator of switch End, the control terminal of pulse signal access switch.
In the normal state, resistance and coupled capacitor are connected in parallel on the input terminal of limiting amplifier, when the control of switch terminates When receiving the pulse signal of impulse generator, the first input end of switch is connected with the second input terminal of switch, so that resistance quilt It is shorted, the other end of coupled capacitor is connect with the input terminal of the reference end of limiting amplifier and limiting amplifier respectively, coupling electricity The electricity of appearance is exported from the reference end of limiting amplifier, realizes the discharge process of coupled capacitor.
Work as pulse signal ends, the first input end of switch and the second input terminal of switch disconnect, and resistance is not shorted, extensive The multiple state that limiting amplifier input terminal is connected in parallel on to resistance and coupled capacitor.
Specifically, trans-impedance amplifier output difference signal accesses coupled capacitor in each road output end of differential signal, Each coupled capacitor is connect with a switch and resistance.
Fig. 3 is another optical module structure schematic diagram provided in an embodiment of the present invention, and principle is identical as Fig. 1.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (5)

1. a kind of optical module, which is characterized in that including optical detector, mirror image circuit, comparator, trigger, impulse generator, open Pass, resistance, coupled capacitor and limiting amplifier, the optical detector are connected with the input terminal of the mirror image circuit, the mirror image The output end of circuit is connected with the first input end of one end of the coupled capacitor and the comparator respectively, the comparator Second input terminal connects reference voltage, and the output end of the comparator is connected with the input terminal of trigger, the trigger it is defeated Outlet is connected with the impulse generator, and the impulse generator is connected with the switch control terminal, and the first of the switch is defeated Enter end to be connected with the reference signal input terminal of the limiting amplifier, one end of the second output terminal of the switch and the resistance Be connected, the other end of the resistance is connected with the input terminal of the limiting amplifier, the third input terminal of the switch with it is described The other end of coupled capacitor is connected, and the other end of the coupled capacitor is also connected with the input terminal of the limiting amplifier, is opening Under the control for closing control terminal, switch first input end is realized respectively and switch the second input terminal or switchs third input terminal and lead It is logical.
2. optical module as described in claim 1, which is characterized in that the optical detector receives discrete optical signal.
3. optical module as claimed in claim 2, which is characterized in that the optical detector includes photodiode and amplifies across resistance Device.
4. optical module as claimed in claim 3, which is characterized in that the trans-impedance amplifier output difference signal, in the difference Each road output end of sub-signal accesses the coupled capacitor, the coupled capacitor with respectively with the switch and the resistance Connection.
5. optical module as claimed in claim 2, which is characterized in that the optical detector is avalanche photodide.
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CN108390725B (en) * 2018-03-30 2021-06-11 青岛海信宽带多媒体技术有限公司 Optical module receiving circuit and optical module
CN109286389B (en) * 2018-11-30 2023-10-27 成都嘉纳海威科技有限责任公司 Signal discrimination device and method for burst mode limiting amplifier
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