CN205490557U

CN205490557U - Multichannel light transceiver module that luminous power is lost warning circuit and is contained it is on average received to multichannel

Info

Publication number: CN205490557U
Application number: CN201620056507.3U
Authority: CN
Inventors: 弋少云; 彭显旭; 王峻岭
Original assignee: Shenzhen Neo Photonic Technology Co Ltd
Current assignee: Longmet Communication Technology Shenzhen Co ltd
Priority date: 2016-01-21
Filing date: 2016-01-21
Publication date: 2016-08-17
Anticipated expiration: 2026-01-21

Abstract

The utility model discloses a multichannel is on average received the luminous power and is lost warning circuit, including photoelectric converter, current -to -voltage convertor, adc and programmable logic device. Photoelectric converter is analog current signal with multichannel light signal conversion, converts it into analog voltage signal by current -to -voltage convertor again, then gives programmable logic device after converting analog voltage signal into data signal by adc, and when the receipt luminous power of any one passageway was less than the threshold threshold value that sets up in advance, the warning signal was received in programmable logic device output. The utility model discloses a digital circuit mode realizes, has reduced the quantity of discrete device, has saved printed circuit board's area, has reduced the device cost. Have simultaneously and report an emergency and ask for help or increased vigilance the threshold threshold values and adjust nimble convenient advantage with sluggish value, and report an emergency and ask for help or increased vigilance and a little do not change anti noise ability reinforce with the sluggishness value along with the temperature. The smooth module product of the little encapsulation low -power consumption of specially adapted multichannel.

Description

Multichannel average received power loses warning circuit and the multichannel light transceiver module comprising it

Technical field

This utility model relates to optical communication field, particularly relates to the loss warning circuit of a kind of multichannel average received power for optical module.

Background technology

Average light power in existing multichannel light module loses warning circuit, in order to be able to meet the requirement of 100us alarm time, generally using multiple discrete devices to realize, it generally includes electrooptical device 201, current-to-voltage convertor part 202, digital to analog converter 203, hysteresis comparator 204 and several parts such as multi input or door 205.See the detailed diagram in Fig. 1.

Multichannel average light power loses the available circuit of alarm, and work process is as follows:

1. multichannel is inputted light and is converted to current signal by electrooptical device (ROSA) 201, and will export as received signal strength indicator (RSSI) after this Multi-path electricity traffic mirroring, then with the resistance 202 pulling down to ground, RSSI electric current is converted to voltage signal；

2. digital to analog converter (DAC) 203 is responsible for arranging the alarming threshold threshold value of each passage；

3. multichannel RSSI voltage and multichannel alarm threshold voltage give multiple hysteresis comparator 205 respectively, when RSSI voltage is less than the lower voltage limit of hysteresis comparator 205, and comparator output high level, i.e. produce a warning signal；When RSSI voltage is higher than the upper voltage limit of hysteresis comparator 205, comparator then output low level, alarm releases；

That a multi input is given in the output of the most hysteresis comparators 205 or door 206, then by 206 realize multiple signal or function, will alert as long as i.e. there being a road light to lose transceiver.

The following shortcomings of existing multichannel average light power warning circuit existence:

1. used by, device is too much；Accounting for printed circuit board (PCB) area excessive, this is particularly disadvantageous to the optical module of small package；Cost is the most higher.

2. the regulation underaction of alarming threshold threshold value and hysteresis is convenient, must realize by changing the separation resistance value in hysteresis comparator circuit, and this is unfavorable for that high-volume manufactures.

3. the change of hysteresis comparator leakage current at different temperatures, can affect alarm point and the change of hysteresis, it is possible to sluggishness can be caused to be unsatisfactory for customer requirement.

Utility model content

The problem existed for prior art, the utility model proposes a kind of multichannel average received power and loses warning circuit, comprise:

Optical-electrical converter, for being converted to analog current signal by multichannel input optical signal；

Current/voltage converter, for being converted to analog voltage signal by current signal；

Analog-digital converter, for being converted into digital quantity by multi-channel analog voltage signal；

PLD, for realizing multi-path digital window comparator, the alarming threshold threshold value that the multipath reception luminous power after digitized is preset respectively and each is compared, when received optical power is less than lower threshold, comparator output high level, Ji Ci road produces warning signal；When received optical power is higher than upper limit threshold, comparator then output low level, the alarm of Ze Ci road releases.

In an embodiment of the present utility model, described PLD also realizes multi input or door, the warning signal that each digital comparator produces is done or computing, as long as thus realizing having the light-receiving of any one passage to lose and will produce the function receiving alarm.

In an embodiment of the present utility model, described PLD is field programmable gate array (FPGA) or CPLD (CPLD).

In an embodiment of the present utility model, described multi-path digital window comparator microcontroller (MCU) is realized by software mode.It is mainly used in alarm and goes the less demanding scene of alarm time.

In an embodiment of the present utility model, described multi input or door microcontroller (MCU) are realized by software mode.It is mainly used in alarm and goes the less demanding scene of alarm time.

This utility model also proposed a kind of multichannel light transceiver module, and it is provided with multichannel average received power as above and loses warning circuit.

In an embodiment of the multichannel light transceiver module of of the present utility model, number of active lanes is more than or equal to 2.

Multichannel average received power of the present utility model loses warning circuit, by by hysteresis comparator digital circuit, provide the advantage that

1. decrease a multichannel digital to analog converter than available circuit, a multichannel analog hysteresis comparator and a multi input or door, decrease number of devices, save PCB surface and amass, reduce cost；

2. the flexible adjustment of alarm point and hysteresis is convenient, is not necessary to change hardware circuit；

3. alarm point and hysteresis also will not change with temperature, and have preferable stability and reliability；

4. capacity of resisting disturbance is strong.

Accompanying drawing explanation

Fig. 1 is the block diagram that existing multichannel average received power loses warning circuit.

Fig. 2 is the block diagram that multichannel average received power of the present utility model loses warning circuit.

Detailed description of the invention

As shown in Figure 2, this utility model includes optical-electrical converter 101, current-to-voltage convertor 102, analog-digital converter 103 and PLD 104.Wherein optical-electrical converter 101, current-to-voltage convertor 102 are similar with Fig. 1 with analog-digital converter 103；PLD 104 instead of the hysteresis comparator 204 in Fig. 1 and multi input or door 205.

Similar with existing circuit, multichannel input optical signal is converted to current signal by first optical-electrical converter (ROSA) 101, and will export as received signal strength indicator (RSSI) after this Multi-path electricity traffic mirroring, with the resistance 102 pulling down to ground, RSSI electric current is converted to voltage signal；Then this RSSI analog voltage signal is converted to digital quantity by analog-digital converter (A/D) 103, has tested the digitized of average received power.

The numeral output of analog-digital converter 103 gives PLD (FPGA or CPLD) 104 by Serial Peripheral Interface (SPI) (SPI) or serial 2 line interface (I2C), programmable logic device 104 realize multiple numerical aperture comparator；Multipath reception luminous power is compared by numerical aperture comparator with respective alarm threshold respectively, and when received optical power is less than lower threshold, comparator output high level, Ji Ci road produces warning signal；When received optical power is higher than upper limit threshold, comparator then output low level, the alarm of Ze Ci road releases.

The hysteresis comparator realized by programmable logic device 104, it alerts and goes the threshold value of alarm point or hysteresis all can be independently arranged flexibly and easily, again need not change hardware circuit；Simultaneously as digital circuit is for temperature insensitive, the most do not deposit the phenomenon that alarm point and hysteresis change at different temperatures.

The warning signal of the multichannel hysteresis comparator output realized by programmable logic device 104 to be given or door realizes or function (will alert as long as i.e. there being a road light to lose transceiver), and this multi input or door also can be realized by programmable logic device 104, thus achieve or door and hysteresis comparator integrated, decrease number of devices.

In a word, this circuit programmable logic device 104 achieves the digitized of hysteresis comparator, and also achieve the integrated of hysteresis comparator and multi input or door, thus obtain the advantages below comparing available circuit: decrease number of devices, save printed circuit board (PCB) area, reduce cost；The flexible adjustment of alarm point and hysteresis is convenient；And alerting and a little do not change with temperature with hysteresis, capacity of resisting disturbance is strong, and product has preferable stability and reliability.This technology has been translated into product, and they have been demonstrated in performance test.

Above example only in order to the technical solution of the utility model to be described, is not intended to limit；Although this utility model being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of this utility model each embodiment technical scheme.

Claims

1. a multichannel average received power loses warning circuit, it is characterised in that comprise:

Multichannel average received power the most according to claim 1 loses warning circuit, it is characterized in that, described PLD also realizes multi input or door, the warning signal that each digital comparator produces is done or computing, as long as thus realizing having the light-receiving of any one passage to lose and will produce the function receiving alarm.

3. lose warning circuit according to the arbitrary described multichannel average received power of claim 1 or 2, it is characterised in that described PLD is field programmable gate array (FPGA) or CPLD (CPLD).

4. a multichannel light transceiver module, it is characterised in that: described multichannel average received power arbitrary just like claim 1-3 is set and loses warning circuit.

Multichannel light transceiver module the most according to claim 4, it is characterised in that: described number of active lanes is more than or equal to 2.