CN203554449U - SFP+LRM optical module capable of warning about loss of signal - Google Patents
SFP+LRM optical module capable of warning about loss of signal Download PDFInfo
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- CN203554449U CN203554449U CN201320700513.4U CN201320700513U CN203554449U CN 203554449 U CN203554449 U CN 203554449U CN 201320700513 U CN201320700513 U CN 201320700513U CN 203554449 U CN203554449 U CN 203554449U
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Abstract
The utility model discloses an SFP+LRM optical module capable of warning about loss of signal. The SFP+LRM optical module comprises a microprocessor, a TOSA, an ROSA, a laser driving chip and a loss of signal detection circuit. A signal output end of the ROSA is connected with an input end of a comparator in the microprocessor. An output end of the comparator is connected with the loss of signal detection circuit. The ROSA receives optical signals and converts the received optical signals into voltage signals to be sent to the input end of the comparator. The comparator compares the voltage signals received by the input end with reference voltage of a reference voltage end and then sends comparison results to the loss of signal detection circuit. The loss of signal detection circuit determines that whether a warning signal is sent or not based on the comparison results. The SFP+LRM optical module is suitable for SFP+LRM optical modules in which a laser driving chip does not have an LOS warning function, and is advantaged by reducing production cost, adjusting warning set values and improving compatibility of the optical module.
Description
Technical field
The utility model relates to optical communication technique field, is specifically related to a kind of SFP+LRM optical module of realizing loss of signal alarm.
Background technology
SFP+LRM optical module be a kind of in multimode fiber the optical transceiver module of 220 meters of transmission 1310nm wavelength farthest, support 10GBASE-LRM ethernet standard, be suitable for FDDI(fiber-distributed data interface, Fiber Distributed Data Interface) network and 10G data communication.
For SFP+ optical module (10Gigabit Small Form Factor Pluggable, 10G small sealing pluggable bright module), when the signal amplitude of receiving terminal is lower than the threshold value arranging, when optical module does not receive signal, must carry out LOS(Loss of singal, dropout) alarm.
The mode that existing SFP+LRM optical module carries out LOS alarm has two kinds: level mode and OMA(optical modulation amplitude) mode.Level mode is to utilize the inner signal strength indicator circuit (RSSI) arranging of laser driving chip to realize, uplink optical signal sends to laser driving chip after being received and be converted into received current signal by light-receiving secondary module (ROSA), in laser driving chip, the sampling resistor of RSSI circuit converts the received current signal receiving to received optical power, and laser driving chip is by judging that received optical power is that low level or high level are realized alarm.And OMA mode is laser driving chip, by the amplitude and the set point that judge received optical power, compare, when the amplitude of received optical power is less than set point, carry out LOS alarm.
Because the LOS alarm of existing SFP+LRM optical module is all to realize by the sampling resistor of laser driving chip inside, because sampling resistor resistance is certain, therefore alert settings amplitude does not have controllability or has limitation, thereby affects the compatibility of SFP+LRM optical module.In addition, for inside, there is no the laser driving chip of integrated LOS alarm function, owing to cannot carrying out LOS alarm, when the amplitude of receiving optical signals is lower, can cause the non-normal working of SFP+LRM optical module.
As from the foregoing, be necessary to provide a kind of SFP+LRM optical module that can regulate according to actual needs alert settings amplitude, raising optical module compatibility, inner laser device to drive chip not have integrated LOS alarm function also can realize LOS alarm and reduce production costs.
Utility model content
The SFP+LRM optical module that the purpose of this utility model has been to provide a kind of can regulate alert settings amplitude according to actual needs, improve optical module compatibility, inner laser device drives chip not have integrated LOS alarm function also can realize LOS alarm and reduce production costs.
According to embodiment of the present utility model, a kind of SFP+LRM optical module of realizing loss of signal alarm is provided, comprise microprocessor, light emission secondary module TOSA, light-receiving secondary module ROSA and for driving the laser driving chip of TOSA utilizing emitted light signal, described laser driving chip is connected with described microprocessor, in described microprocessor, be provided with comparator, described SFP+LRM optical module inside is also provided with signal loss detection circuit;
The signal output part of described ROSA is connected with the input of described comparator; The output of described comparator is connected with described signal loss detection circuit;
Described ROSA receiving optical signals is also converted to the described light signal receiving the input that is sent to described comparator after voltage signal, the voltage signal that described comparator receives according to input and the reference voltage comparison of reference voltage terminal, and comparative result is sent to signal loss detection circuit, described signal loss detection circuit judges whether to send alarm signal according to described comparative result.
Further, SFP+LRM optical module also comprises the first resistance and second resistance of series connection,
The input of the first resistance is connected with the power supply of described SFP+LRM optical module, the output head grounding of the second resistance, and the reference voltage terminal of described comparator is connected with the circuit between the first resistance and the second resistance.
Wherein, described ROSA comprises the optical receiver and the trans-impedance amplifier that connect successively, and the output of described trans-impedance amplifier is connected with the input of described comparator.
Preferably, described optical receiver is photodiode or avalanche photodide.
Further, SFP+LRM optical module also comprises:
Power supply slow switch circuit, its input is connected with the power supply of described SFP+LRM optical module, and its first output is connected with the power interface of described TOSA, and its second output is connected with the power interface of described ROSA.
Further, SFP+LRM optical module also comprises electrical interface, and described electrical interface comprises 20 pins.
Preferably, described microprocessor is that model is the microprocessor of C8051F396.
Wherein, in described microprocessor, the input of comparator is pin P1.3, and output is P1.4, and reference voltage pin is P1.6.
As shown from the above technical solution, the utility model is applicable to not have in laser driving chip the SFP+LRM optical module of integrated LOS alarm function.The utility model utilizes the comparator of microprocessor in SFP+LRM optical module to realize loss of signal alarm function, owing to not needing to increase extra components and parts or chip is realized, has therefore reduced production cost.Because the reference voltage value (being alert settings value) of comparator regulates by the first resistance in peripheral circuit and the second resistance, therefore the utility model can regulate alert settings value simultaneously, thereby improves the compatibility of SFP+LRM optical module.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described.Apparently, the accompanying drawing in below describing is only embodiment more of the present utility model, for those of ordinary skills, can also obtain according to these accompanying drawing illustrated embodiments other embodiment and accompanying drawing thereof.
Fig. 1 shows the structural representation of the SFP+LRM optical module of realizing loss of signal alarm in the present embodiment;
Fig. 2 shows the pin schematic diagram that model is the microprocessor of C8051F396;
Fig. 3 shows the circuit diagram that utilizes C8051F396 microprocessor to realize loss of signal alarm.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the utility model is further described.But, it should be noted that, many details of listing in specification are only used to make reader to have a thorough understanding to one or more aspects of the present utility model, even if do not have these specific details also can realize these aspects of the present utility model.
Inventor of the present utility model considers, in each SFP+LRM optical module, be equipped with microprocessor, and comparator all can be set in microprocessor, when there is no integrated LOS warning circuit in the laser driving chip in SFP+LRM optical module, voltage signal in ROSA is directly inputted into the comparator that utilizes MCU inside, because the amplitude of trans-impedance amplifier output signal in ROSA is directly proportional to the peak value at received optical power peak in the trans-impedance amplifier range of linearity (being optical modulation amplitude OMA), therefore the size that detects ROSA output voltage signal can detect the size of optical modulation amplitude, thereby reach the object of loss of signal alarm.
Fig. 1 shows the structural representation of the SFP+LRM optical module of realizing loss of signal alarm in the present embodiment.As shown in Figure 1, SFP+LRM optical module comprises microprocessor 1, light emission secondary module TOSA, light-receiving secondary module ROSA, laser driving chip 2 and signal loss detection circuit 3.Wherein,
In microprocessor 1, be provided with comparator 10.
The input of laser driving chip 2 is connected with microprocessor 1, and its output is connected with TOSA, for driving TOSA utilizing emitted light signal;
The signal output part of ROSA is connected with the input of the comparator 10 in microprocessor 1.Particularly, the ROSA in the present embodiment comprises optical receiver 4 and trans-impedance amplifier 5.Optical receiver 4 is connected successively with trans-impedance amplifier 5.The output of trans-impedance amplifier 5 is connected with the input of comparator 10.Optical receiver 4 receiving optical signals and the light signal receiving is converted to voltage signal after send to trans-impedance amplifier 5, trans-impedance amplifier 5 is sent in comparator 10 after will voltage signal amplifying.Preferably, in the present embodiment, optical receiver 4 preferred light electric diode (PIN) or avalanche photo diode (APD)s.
Because the amplitude of trans-impedance amplifier 5 output signals and the peak value (being optical modulation amplitude OMA) at received optical power peak in trans-impedance amplifier 5 ranges of linearity are directly proportional, the size that therefore detects ROSA output voltage signal can detect the size of optical modulation amplitude.
The output of comparator 10 is connected with signal loss detection circuit 3.The voltage signal that comparator 10 receives according to input and the reference voltage comparison of reference voltage terminal, and comparative result is sent to signal loss detection circuit.
The comparative result that signal loss detection circuit draws according to comparator 10 judges whether to send alarm signal.
Further, SFP+LRM optical module also comprises the first resistance R 1 and second resistance R 2 of series connection.Wherein, the input of the first resistance is connected with the power supply of SFP+LRM optical module, the output head grounding of the second resistance, and the reference voltage terminal of comparator 10 is connected with the circuit between the first resistance and the second resistance.
Further, SFP+LRM optical module also comprises power supply slow switch circuit 6.Wherein, the input of power supply slow switch circuit is connected with the power supply of SFP+LRM optical module, and its first output is connected with the power interface of TOSA, and its second output is connected with the power interface of ROSA.Power supply slow switch circuit, for the moment of the power connection at SFP+LRM optical module, prevents that TOSA and ROSA are subject to voltge surge.
The electrical interface arranging on SFP+LRM optical module in the utility model is the electrical interface that comprises 20 pins.As preferred embodiment, the electrical interface in the present embodiment is the golden finger of 20 pins.
Fig. 2 shows the pin schematic diagram that model is the microprocessor 1 of C8051F396;
Fig. 3 shows the circuit diagram that utilizes C8051F396 microprocessor 1 to realize loss of signal alarm.
As shown in Figures 2 and 3, C8051F396 microprocessor 1 has 1～20 pin.
When C8051F396 microprocessor 1 is when device 10 uses as a comparison, even number pin is '+', and odd number pin is '-', and in the present embodiment, P1.3 pin is the input of comparator 10, and P1.6 pin is reference voltage terminal.P1.4 pin is output.
As shown in Figure 3, P1.3 pin receives the voltage signal that trans-impedance amplifier 5 amplifies in ROSA, compares with the reference voltage of P1.6 pin.
When receive voltage signal lower than arrange reference signal time, P1.4 pin is output as high level, RX_LOS is in high level, optical module enters los state;
When receive voltage signal higher than arrange reference signal time, P1.4 pin is output as low level, RX_LOS is in low level, module is normally exported.
What suppose SFP+LRM optical module in the present embodiment is A dBm(dBm at received optical power) time module in los state, magnitude of voltage corresponding to DAC can read under this received optical power correspondence by C8051F396 microprocessor 1 is B.The magnitude of voltage corresponding due to maximum sampling ADC is 2.4V, and ADC value and magnitude of voltage are linear relations, therefore can calculate P1.6 pin at DAC value corresponding magnitude of voltage when the B, also can calculate the resistance of the first resistance R 1 and the second resistance R 2 according to Ohm's law.
In the present embodiment, the resistance of the first resistance R 1 and the second resistance R 2 can be adjusted according to user's actual demand, easy to operate simple.
By above technical scheme, the utility model is applicable to not have in laser driving chip 2 the SFP+LRM optical module of integrated LOS alarm function.The utility model utilizes the comparator 10 of microprocessor 1 in SFP+LRM optical module to realize loss of signal alarm function, owing to not needing to increase extra components and parts or chip is realized, has therefore reduced production cost.Because the reference voltage value (being alert settings value) of comparator 10 regulates by the first resistance in peripheral circuit and the second resistance, therefore the utility model can regulate alert settings value simultaneously, thereby improves the compatibility of SFP+LRM optical module.
The foregoing is only preferred embodiment of the present utility model, not for limiting protection range of the present utility model.All within spirit of the present utility model and principle, any modification of doing, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. realize the SFP+LRM optical module of loss of signal alarm for one kind, comprise microprocessor, light emission secondary module TOSA, light-receiving secondary module ROSA and for driving the laser driving chip of TOSA utilizing emitted light signal, described laser driving chip is connected with described microprocessor, in described microprocessor, be provided with comparator, it is characterized in that, described SFP+LRM optical module inside is also provided with signal loss detection circuit;
The signal output part of described ROSA is connected with the input of described comparator; The output of described comparator is connected with described signal loss detection circuit;
Described ROSA receiving optical signals is also converted to the described light signal receiving the input that is sent to described comparator after voltage signal, the voltage signal that described comparator receives according to input and the reference voltage comparison of reference voltage terminal, and comparative result is sent to signal loss detection circuit, described signal loss detection circuit judges whether to send alarm signal according to described comparative result.
2. SFP+LRM optical module according to claim 1, is characterized in that, also comprises the first resistance and second resistance of series connection,
The input of the first resistance is connected with the power supply of described SFP+LRM optical module, the output head grounding of the second resistance, and the reference voltage terminal of described comparator is connected with the circuit between the first resistance and the second resistance.
3. SFP+LRM optical module according to claim 1, is characterized in that, described ROSA comprises the optical receiver and the trans-impedance amplifier that connect successively, and the output of described trans-impedance amplifier is connected with the input of described comparator.
4. SFP+LRM optical module according to claim 3, is characterized in that, described optical receiver is photodiode or avalanche photodide.
5. SFP+LRM optical module according to claim 1, is characterized in that, also comprises:
Power supply slow switch circuit, its input is connected with the power supply of described SFP+LRM optical module, and its first output is connected with the power interface of described TOSA, and its second output is connected with the power interface of described ROSA.
6. according to arbitrary described SFP+LRM optical module in claim 1 to 5, it is characterized in that, also comprise electrical interface, described electrical interface comprises 20 pins.
7. SFP+LRM optical module according to claim 6, is characterized in that, described microprocessor is that model is the microprocessor of C8051F396.
8. SFP+LRM optical module according to claim 7, is characterized in that, in described microprocessor, the input of comparator is pin P1.3, and output is P1.4, and reference voltage pin is P1.6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320700513.4U CN203554449U (en) | 2013-11-07 | 2013-11-07 | SFP+LRM optical module capable of warning about loss of signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320700513.4U CN203554449U (en) | 2013-11-07 | 2013-11-07 | SFP+LRM optical module capable of warning about loss of signal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788692A (en) * | 2016-12-15 | 2017-05-31 | 武汉电信器件有限公司 | A kind of test equipment and its method of testing of module LOS |
| CN107800484A (en) * | 2016-08-30 | 2018-03-13 | 成都芯瑞科技股份有限公司 | 1 × 9 Ultra-Low Speed DDMI optical modules |
| CN108880671A (en) * | 2018-06-20 | 2018-11-23 | 深圳市飞思卓科技有限公司 | The signal loss detection circuit and device of four-way optical module |
| CN111740785A (en) * | 2020-08-24 | 2020-10-02 | 深圳市迅特通信技术有限公司 | PAM4 optical module receiving and output control circuit, method and system |
| CN112600626A (en) * | 2021-03-04 | 2021-04-02 | 深圳市迅特通信技术股份有限公司 | Optical module and communication device |
| CN113311255A (en) * | 2021-04-16 | 2021-08-27 | 湖南大科激光有限公司 | Fault diagnosis system of laser |
-
2013
- 2013-11-07 CN CN201320700513.4U patent/CN203554449U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800484A (en) * | 2016-08-30 | 2018-03-13 | 成都芯瑞科技股份有限公司 | 1 × 9 Ultra-Low Speed DDMI optical modules |
| CN106788692A (en) * | 2016-12-15 | 2017-05-31 | 武汉电信器件有限公司 | A kind of test equipment and its method of testing of module LOS |
| CN108880671A (en) * | 2018-06-20 | 2018-11-23 | 深圳市飞思卓科技有限公司 | The signal loss detection circuit and device of four-way optical module |
| CN111740785A (en) * | 2020-08-24 | 2020-10-02 | 深圳市迅特通信技术有限公司 | PAM4 optical module receiving and output control circuit, method and system |
| CN111740785B (en) * | 2020-08-24 | 2020-12-08 | 深圳市迅特通信技术有限公司 | PAM4 optical module receiving and output control circuit, method and system |
| CN112600626A (en) * | 2021-03-04 | 2021-04-02 | 深圳市迅特通信技术股份有限公司 | Optical module and communication device |
| CN112600626B (en) * | 2021-03-04 | 2021-06-08 | 深圳市迅特通信技术股份有限公司 | Optical module and communication device |
| CN113311255A (en) * | 2021-04-16 | 2021-08-27 | 湖南大科激光有限公司 | Fault diagnosis system of laser |
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Granted publication date: 20140416 |