CN201584977U - Broadband passive optical network local-side light receiving-transmitting integrated module - Google Patents
Broadband passive optical network local-side light receiving-transmitting integrated module Download PDFInfo
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- CN201584977U CN201584977U CN2010200155921U CN201020015592U CN201584977U CN 201584977 U CN201584977 U CN 201584977U CN 2010200155921 U CN2010200155921 U CN 2010200155921U CN 201020015592 U CN201020015592 U CN 201020015592U CN 201584977 U CN201584977 U CN 201584977U
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Abstract
The utility model discloses a broadband passive optical network local-side light receiving-transmitting integrated module, which comprises a receiver circuit, wherein the receiver circuit is provided with a first limiting amplifier; the receiver circuit is also provided with a signal indication generating circuit, and the signal indication generating circuit comprises a voltage comparison unit; one input end of the voltage comparison unit is connected with the output end of the first limiting amplifier, the other input end thereof is connected with a reference voltage, and the output end thereof outputs a signal for the signal indication. The signal indication generating circuit which is arranged outside the limiting amplifier is arranged inside the light receiving-transmitting integrated module, so the rapid signal indication of the optical receiving-transmitting integrated module under the sudden transmission and receiving mode can be realized, and the quality of the sudden-transmitted and received optical signal is improved.
Description
Technical field
The utility model relates to a kind of integrated module of optical transceiver, specifically, relates to a kind of integrated module of optical transceiver that is used for the broadband passive optical network local side, belongs to the optical communication technique field.
Background technology
Broadband passive optical network (BPON) is in ripe a kind of EPON (PON) access technology of North America development.BPON adopts the passive light access technology of point to the multidrop topology structure, is made up of the optical line terminal OLT of local side, the optical network unit ONU and the optical detection distribution network of user side.Wherein, the integrated module of optical transceiver that is applied in local side comprises optical assembly, continuous mode data transmission machine circuit and the burst mode Data Receiving machine circuit of integrated setting.Described receiver circuit is used for the light signal that optical assembly receives is converted to the signal of telecommunication, and the received signal output that passes through the integrated module of optical transceiver is exported, handle use for late-class circuit, it comprises trans-impedance amplifier TIA that realizes the current/voltage conversion and the limiting amplifier LA that signal is amplified.
Optical communication system when an ONU will reach the standard grade registration, can be sent a registration packet when work; After OLT receives registration packet, fast reaction, to reduce the consumption of lead code.At this moment, need the local side integrated module of optical transceiver to send the alerting signal that a registration packet arrives, i.e. signal indication (SD).The existing BPON local side integrated module of optical transceiver generally adopts the built-in signal indication of limiting amplifier that the alerting signal that circuit provides registration packet to arrive takes place.But owing to be subjected to the restriction of aspects such as technology, cost, the response speed of the signal indication generation circuit that limiting amplifier is built-in is slower, can only arrive 150ns at the soonest, can't satisfy the application requirements of burst receiving mode.
In addition, also there is following deficiency in the existing BPON local side integrated module of optical transceiver: on the one hand, in optical communication system, what be connected with the received signal output of the local side integrated module of optical transceiver is the clock and data recovery chip, when no receiving optical signals, limiting amplifier will produce noise at the received signal output, cause the misoperation of clock and data recovery chip easily.On the other hand, owing to lack special-purpose trans-impedance amplifier, cause the sensitivity of the integrated module of optical transceiver lower, but influenced the quantity of the ONU of an OLT communication, and influenced the transmission range of OLT.
Summary of the invention
The purpose of this utility model is to provide a kind of broadband passive optical network local side integrated module of optical transceiver, circuit takes place by the signal indication that is placed on limiting amplifier is set in the integrated module of optical transceiver, realize the fast signal indication under the integrated module of optical transceiver burst receiving mode, improve the quality of burst receiving optical signals.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of broadband passive optical network local side integrated module of optical transceiver comprises receiver circuit, and described receiver circuit has first limiting amplifier; Described receiver circuit also is provided with the signal indication circuit takes place, and described signal indication circuit takes place comprises voltage comparison unit; An input of described voltage comparison unit is connected on the output of described first limiting amplifier, and another input connects reference voltage, and its output output is used for the signal of signal indication.
According to the utility model, described voltage comparison unit adopts voltage comparator to realize.For satisfying the requirement that voltage comparator is held time to level, an input of described voltage comparator connects the output of described first limiting amplifier by the voltage holding unit, another input connects reference voltage, and its output output is used for the signal of signal indication.
According to the utility model, described voltage holding unit includes charging capacitor; One of described charging capacitor discharges and recharges terminal connects described first limiting amplifier on the one hand by first diode output, and the anode of described first diode is connected with the output of described first limiting amplifier; An input that connects described voltage comparison unit on the other hand; Another of described charging capacitor discharges and recharges terminal ground connection.
According to the utility model, for realizing the output noise elimination of the integrated module of optical transceiver, promptly when no receiving optical signals, can not cause noise effect to back level clock and data recovery chip, described receiver circuit also is provided with second limiting amplifier, its input is connected on the output of described first limiting amplifier, and its control end is connected on the output of described voltage comparison unit, the received signal of its output output integrated module of optical transceiver.
Wherein, the control end of described second limiting amplifier can be its Enable Pin.
According to the utility model, for improving the sensitivity of the integrated module of optical transceiver, consider to adopt the method that strengthens its resetting time to realize, therefore, described receiver circuit also is provided with the reset signal stretch circuit, its input connects external reset signal, and its output connects the reset signal input of described first limiting amplifier.
According to the utility model, described reset signal stretch circuit can adopt following circuit to realize: be in series with second diode between its input and output, the anode of described second diode is connected on the input; On the connecting line between the negative electrode of the output of described reset signal stretch circuit and described second diode, be connected with the parallel branch that resistance and electric capacity are formed, the other end ground connection of described parallel branch.
Compared with prior art, advantage of the present utility model and good effect are:
1, by the signal indication that is placed on limiting amplifier is set circuit takes place in the integrated module of optical transceiver, can adopt the faster circuitry structure of response speed to realize the fast signal of received signal under the burst receiving mode is indicated, improve the response speed of the integrated module of optical transceiver, improve the quality of burst receiving optical signals receiving optical signals.
2, in the integrated module of optical transceiver, adopt the mode of two limiting amplifier cascades to export receiving optical signals, utilize second limiting amplifier of signal index signal control of first limiting amplifier, when no receiving optical signals, the output of second limiting amplifier is closed, realize the output noise elimination function of the integrated module of optical transceiver, and can not influence the receiving sensitivity of the integrated module of optical transceiver.
3, by the reset signal stretch circuit is set in the integrated module of optical transceiver, the broadening reseting pulse signal, to strengthen the resetting time of limiting amplifier, improve the sensitivity of the integrated module of optical transceiver, strengthen the transmission range of local side integrated module of optical transceiver signal, increase the number of the ONU of local side OLT institute communication.
Description of drawings
Fig. 1 is the theory structure block diagram of an embodiment of the broadband passive optical network local side integrated module of optical transceiver described in the utility model;
Fig. 2 is the circuit principle structure figure that realizes fast signal indication and output noise elimination among Fig. 1 embodiment;
Fig. 3 is the principle assumption diagram of reset signal stretch circuit among Fig. 1 embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
The slower problem of response speed of circuit takes place in the built-in signal indication of the limiting amplifier that the utility model exists at the existing BPON local side integrated module of optical transceiver, a kind of broadband passive optical network local side integrated module of optical transceiver is provided, be provided with the signal indication that is placed on limiting amplifier circuit takes place, an input of the voltage comparison unit in the circuit is connected on the output of the limiting amplifier in traditional integrated module of optical transceiver, and another input connects reference voltage.By reference voltage rationally is set, can utilize the signal of the output signal of voltage comparison unit as the signal indication that is used for the registration packet arriving reminding in the integrated module of optical transceiver.By selecting response speed voltage comparison unit faster for use, just can realize the fast signal indication under the integrated module of optical transceiver burst mode.
Figure 1 shows that the theory structure block diagram of an embodiment of the broadband passive optical network local side integrated module of optical transceiver described in the utility model.
As shown in Figure 1, the optical module inside of this embodiment comprises BOSA optical assembly, continuous mode data transmission machine circuit and the burst mode Data Receiving machine circuit of integrated setting.Described optical assembly comprises laser LD and photodetector PIN PD.Described transmitter circuitry comprises drive circuit for laser LD Driver and automatic optical power control circuit APC, has the fault warning function simultaneously.Described receiver circuit comprises trans-impedance amplifier TIA that realizes the current/voltage conversion and first limiting amplifier that signal is amplified, and wherein, described trans-impedance amplifier TIA is built in the described BOSA optical assembly.
For realizing the fast signal deixis of optical module, the receiver circuit of this embodiment is provided with and is placed on outside described first limiting amplifier and the signal that is connected with its output indication generation circuit, and the signal SD that circuit output is used for the signal indication of registration packet arriving reminding takes place in described signal indication.
On the other hand, the optical module of this embodiment is for realizing output noise elimination function, in described receiver circuit, also be provided with output noise elimination unit, described noise elimination unit is connected between the reception output signal of described first limiting amplifier and optical module, to be implemented under the prerequisite that does not influence the optical module receiving sensitivity, guarantee the output noise elimination.
Optical module utilizes outside reset signal Reset, can remove the influence between each ONU as much as possible in the gap of each ONU communication of user side.The sensitivity of optical module is high more, and the influence between each ONU is more little, and the ONU quantity that local side OLT can communication is many more, and the local side OLT signal transmission distance is farther.Owing to lack special-purpose trans-impedance amplifier TIA, the receiving sensitivity of traditional optical module is lower, when optical module resets, causes influencing each other between a plurality of ONU easily.For improving the receiving sensitivity of optical module, the optical module of this example is provided with the reset signal stretch circuit in receiver circuit, its input connects external reset signal, its output connects the reset signal input of described limiting amplifier, be used for and carry out broadening from the pulse duration of the reset signal Reset of optical module outside, strengthening resetting time, and then improve the receiving sensitivity of optical module.
Fig. 2 is the circuit principle structure figure that realizes fast signal indication and output noise elimination among Fig. 1 embodiment.
As shown in Figure 2, described optical module includes first limiting amplifier, and the input of this first limiting amplifier is connected with described trans-impedance amplifier TIA, is used for signal to the output of TIA and carries out amplitude limit and amplify.The indication of described signal takes place that circuit comprises the voltage holding unit and as the voltage comparator of voltage comparison unit, described voltage holding unit is connected between described first limiting amplifier and the described voltage comparator, be used for the signal of described first limiting amplifier output is carried out broadening, to satisfy the requirement that described voltage comparator is held time to level.
Wherein, described voltage holding unit includes charging capacitor C1, a charging terminal of described capacitor C 1 is connected on the output of described first limiting amplifier by diode D1 on the one hand, is connected on the other hand on the forward voltage input In+ of described voltage comparator; Another charging terminal ground connection of described capacitor C 1.Be connected with reference voltage on the reverse input end In-of described voltage comparator, and its output out is used for output the signal SD of signal indication.By the choose reasonable reference voltage level, it is not had at optical module receive the voltage that the light time is higher than the positive input of described voltage comparator, receive the crest voltage that the light time is lower than the positive input of described voltage comparator and have, thereby be the exportable SD signal that meets the demands at the output of voltage comparator at optical module.Because it is external that circuit takes place in the signal indication, to the less-restrictive of circuit structure, can select response speed voltage comparator faster, realize the fast signal indication under the optical module burst mode, and do not influence other performances of optical module.
For realizing the output noise elimination of optical module, promptly when no receiving optical signals, can not cause noise effect to back level clock and data recovery chip, this embodiment adopts the mode of two limiting amplifier cascades.As shown in Figure 2, on the output of described first limiting amplifier, be connected with second limiting amplifier, constitute output noise elimination unit.The received signal of the output output integrated module of optical transceiver of described second limiting amplifier, and its Enable Pin/EN is connected on the output out of described voltage comparator.The signal that utilizes described voltage comparator to produce is indicated the control signal of SD signal as described second limiting amplifier, control its enable port, when optical module does not have receiving optical signals, the output of described second limiting amplifier is closed, realize the output noise elimination of optical module.And when optical module had receiving optical signals, it was open-minded to control described second limiting amplifier, exported normal received signal.
Figure 3 shows that the principle assumption diagram of reset signal stretch circuit among Fig. 1 embodiment.As shown in the figure, the input a of reset signal stretch circuit connects external reset signal Reset, and its output b connects the reset signal input of described first limiting amplifier.Described reset signal input is connected with described reset signal output b by unidirectional conducting diode D2, and the anode of described diode D2 connects described input a; On the connecting line between the negative electrode of described output b and described diode D2, be connected with the parallel branch that resistance R 1 and capacitor C 2 are formed, the other end ground connection of described parallel branch.The operation principle of this circuit is: when input a had the direct impulse input, described diode D2 conducting a rising edge occurred at output b, and simultaneously, described capacitor C 2 begins to carry out charge and discharge process.By adjusting the numerical value of resistance R 1 and capacitor C 2, can control capacitance C2 discharge and recharge the time when capacitor C 2 discharge offs, just understood and trailing edge be occurred at output b.Therefore, the pulse duration of the reset signal that input a can be imported is carried out broadening, and the amplitude of broadening is by the time constant decision of described parallel branch.Time constant is big more, and the broadening amplitude is also big more.The resistance R 1 by selecting suitable resistance and the capacitor C 2 of suitable appearance value can realize the broadening amplitude of demand.
Certainly, described reset signal stretch circuit is not limited to the structure of Fig. 3, also can adopt Schmidt trigger to realize pulse stretching, and the utility model is not done concrete qualification to this.
The integrated module of optical transceiver of the foregoing description has been realized fast signal deixis and noise elimination function, the fast signal deixis can be so that simple more, quick to the facility registration in the optical communication system, and the noise elimination function can be saved bandwidth so that the integrated module of optical transceiver recovers fast easily.In addition, the integrated module of optical transceiver of described embodiment has also been realized high receiving sensitivity, has realized the receiving sensitivity of the integrated module of optical transceiver under strict sequential order, has satisfied the demand of producing in batches.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (9)
1. a broadband passive optical network local side integrated module of optical transceiver comprises receiver circuit, and described receiver circuit has first limiting amplifier; It is characterized in that described receiver circuit also is provided with the signal indication circuit takes place, circuit takes place and comprises voltage comparison unit in described signal indication; An input of described voltage comparison unit is connected on the output of described first limiting amplifier, and another input connects reference voltage, and its output output is used for the signal of signal indication.
2. the integrated module of optical transceiver according to claim 1 is characterized in that, described voltage comparison unit adopts voltage comparator to realize; An input of described voltage comparator connects the output of described first limiting amplifier by the voltage holding unit, and another input connects reference voltage, and its output output is used for the signal of signal indication.
3. the integrated module of optical transceiver according to claim 2 is characterized in that, described voltage holding unit includes charging capacitor; One of described charging capacitor discharges and recharges terminal connects described first limiting amplifier on the one hand by first diode output, and the anode of described first diode is connected with the output of described first limiting amplifier; An input that connects described voltage comparison unit on the other hand; Another of described charging capacitor discharges and recharges terminal ground connection.
4. according to each described integrated module of optical transceiver in the claim 1 to 3, it is characterized in that, described receiver circuit also is provided with second limiting amplifier, its input is connected on the output of described first limiting amplifier, its control end is connected on the output of described voltage comparison unit, the received signal of its output output integrated module of optical transceiver.
5. the integrated module of optical transceiver according to claim 4 is characterized in that, the control end of described second limiting amplifier is its Enable Pin.
6. according to each described integrated module of optical transceiver in the claim 1 to 3, it is characterized in that, described receiver circuit also is provided with the reset signal stretch circuit, and its input connects external reset signal, and its output connects the reset signal input of described first limiting amplifier.
7. the integrated module of optical transceiver according to claim 6 is characterized in that, is in series with second diode between the input of described reset signal stretch circuit and the output, and the anode of described second diode is connected on the input; On the connecting line between the negative electrode of the output of described reset signal stretch circuit and described second diode, be connected with the parallel branch that resistance and electric capacity are formed, the other end ground connection of described parallel branch.
8. the integrated module of optical transceiver according to claim 4, it is characterized in that, described receiver circuit also is provided with the reset signal stretch circuit, and its input connects external reset signal, and its output connects the reset signal input of described first limiting amplifier.
9. the integrated module of optical transceiver according to claim 8 is characterized in that, is in series with second diode between the input of described reset signal stretch circuit and the output, and the anode of described second diode is connected on the input; On the connecting line between the negative electrode of the output of described reset signal stretch circuit and described second diode, be connected with the parallel branch that resistance and electric capacity are formed, the other end ground connection of described parallel branch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010200155921U CN201584977U (en) | 2010-01-18 | 2010-01-18 | Broadband passive optical network local-side light receiving-transmitting integrated module |
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| CN2010200155921U CN201584977U (en) | 2010-01-18 | 2010-01-18 | Broadband passive optical network local-side light receiving-transmitting integrated module |
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| CN201584977U true CN201584977U (en) | 2010-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595473A (en) * | 2013-06-04 | 2014-02-19 | 青岛海信宽带多媒体技术有限公司 | Burst mode reception control circuit and burst mode light receiver |
-
2010
- 2010-01-18 CN CN2010200155921U patent/CN201584977U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595473A (en) * | 2013-06-04 | 2014-02-19 | 青岛海信宽带多媒体技术有限公司 | Burst mode reception control circuit and burst mode light receiver |
| CN103595473B (en) * | 2013-06-04 | 2016-06-29 | 青岛海信宽带多媒体技术有限公司 | Burst reception control circuit and burst mode optical receiver |
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Granted publication date: 20100915 |