CN102801967A - SFP (System File Protection) optical module for transferring non-compressed video signal - Google Patents
SFP (System File Protection) optical module for transferring non-compressed video signal Download PDFInfo
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- CN102801967A CN102801967A CN2012102370095A CN201210237009A CN102801967A CN 102801967 A CN102801967 A CN 102801967A CN 2012102370095 A CN2012102370095 A CN 2012102370095A CN 201210237009 A CN201210237009 A CN 201210237009A CN 102801967 A CN102801967 A CN 102801967A
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Abstract
The invention discloses an SFP (System File Protection) optical module for transferring a non-compressed video signal, and the SFP optical module comprises an optical receiving sub-module, an optical transmitting sub-module, an optical transmitter control circuit, an optical receiver control circuit and a micro controller, wherein the optical transmitter control circuit is in direct current coupling with the optical transmitting sub-module and used for controlling the light emitting state of the optical transmitting sub-module, the optical transmitter control circuit comprises a laser drive circuit, a direct current coupling circuit and a filter circuit, and the optical receiver control circuit is in capacitance coupling with the optical receiving sub-module and comprises a limited amplitude amplification circuit and an APD (Avalanche Photo Diode) boost circuit. According to the SFP optical module disclosed by the invention, the optical transmitter control circuit is in direct current coupling with the optical transmitting sub-module and used for strengthening the capability of processing a sick signal through filtering by the filter circuit, and the optical receiver control circuit adopts capacitance coupling to increase the transmission bandwidth and avoid preventing a low-frequency signal from passing through by a low-frequency filter formed by the receiving coupling circuit, so that occurrence of the sick signal during transmission of the video signal is effectively solved.
Description
[technical field]
The present invention relates to the SFP optical module, relate in particular to a kind of SFP optical module that is used for Optical Fiber Transmission non-compression video signal.
[background technology]
The HD video long-distance transmissions is widely used at numerous safety-security areas such as highway, safe city, intelligent transportation, public security, finance, water conservancy, oil, electric power, army, colliery, radio and television.Under the digital video monitoring pattern, at present technology can be divided into compact model and non-compact model, compact model be use such as MPEG-4, MPEG-2, H.264 video encoding and decoding standard is handled video information compression, so that transmission, storage.Vision signal for compression is transmitted with the common the same IP network that also can adopt of digital signal.
Adopt dynamic IP long-distance transmissions vision signal, this moment, compressed encoding can bring loss in various degree to video information, when compression ratio is high; Image fault is serious; Occur mosaic and blocking effect phenomenon easily, requiring the occasion of high definition, this distortion is unallowed.In order to guarantee the quality of transmission video signal, can not compress vision signal.Adopt 75 ohm coaxial cable to transmit incompressible vision signal, can accomplish the transmission of primary signal, shortcoming is can not long-distance transmissions.
Therefore when long-distance transmissions non-compression video signal, adopt the transmission bipolarity nonreturn to zero code of optical fiber telecommunications system, but transmit the problem that the non-compression video signal unavoidably can have ill signal (pathological patterns).
[summary of the invention]
Based on this, be necessary to provide a kind of SFP optical module that is used for Optical Fiber Transmission non-compression video signal of in the optical fiber telecommunications system transmission course, avoiding ill signal to occur.
A kind of SFP optical module that is used for Optical Fiber Transmission non-compression video signal, said SFP optical module comprise light-receiving secondary module, light emission secondary module, optical sender control circuit, optical receiver control circuit and microcontroller;
Said optical sender control circuit adopts direct-current coupling to said light emission secondary module, is used to control the luminance of said light emission secondary module; Said optical sender control circuit comprises laser drive circuit, DC coupling circuit and filter circuit; Said laser drive circuit is connected with said light emission secondary module, said DC coupling circuit and said filter circuit; Said laser drive circuit comprises laser driver, and being used for provides drive current to said light emission secondary module; Said laser driver is connected with said microcontroller, and said microcontroller is used to control and monitor the output current of said laser driver;
Said optical receiver control circuit adopts and is capacitively coupled to said light-receiving secondary module, is used to receive the signal of telecommunication of light-receiving secondary module and operating voltage is provided for the light-receiving secondary module; Said optical receiver control circuit comprises amplitude limiting amplifier circuit and APD booster circuit; Said amplitude limiting amplifier circuit and said APD booster circuit are connected with said light-receiving secondary module; Said amplitude limiting amplifier circuit is used to recover the signal of telecommunication of the ultralow frequency cut-off frequency of said light-receiving secondary module output; Said APD booster circuit is used for normal operating voltage to the light-receiving secondary module being provided; Said APD booster circuit also is connected with said microcontroller, and said microcontroller is used to control the output voltage of said APD booster circuit.
Among embodiment, said light-receiving secondary module is PIN photodiode or avalanche photodide therein.
Therein among embodiment; Said light-receiving secondary module also comprises trans-impedance amplifier; Said amplitude limiting amplifier circuit is connected with trans-impedance amplifier in the light-receiving secondary module; Be used to recover the signal of telecommunication of the trans-impedance amplifier output of said light-receiving secondary module, said APD booster circuit connects the light-receiving secondary module, is used to provide normal working voltage to the light-receiving secondary module.
Therein among embodiment, the APD booster circuit loop that high light of the direct FEEDBACK CONTROL of said optical receiver control circuit and low light are formed.
Therein among embodiment, said SFP optical module comprises the packing forms that two fine transmitting-receivings, two, two receipts, single-shot list are received.
Among embodiment, said optical receiver control circuit adopts 4.7 microfarads to be capacitively coupled to the light-receiving secondary module therein.
The optical sender control circuit adopts direct-current coupling to light emission secondary module and to strengthen ill Signal Processing ability through filter circuit filtering in the above-mentioned SFP optical module; The optical receiver control circuit then adopts capacitive coupling can increase transmission bandwidth; And the low-frequency filter of avoiding receiving coupling circuit formation stops low frequency signal to pass through, thereby the appearance that effectively solves the ill signal in the transmission of video signals.
[description of drawings]
Fig. 1 is the structural representation that is used for the SFP optical module of Optical Fiber Transmission non-compression video signal;
Fig. 2 adopts the structural representation of two fine transmitting-receivings for the SFP optical module;
Fig. 3 is two fine two structural representations of sending out for the SFP optical module adopts;
Fig. 4 is two fine two structural representations of receiving for the SFP optical module adopts;
Fig. 5 adopts the structural representation of single fiber single-shot for the SFP optical module;
The structural representation that Fig. 6 adopts the single fiber list to receive for the SFP optical module.
[embodiment]
As shown in Figure 1, be the structural representation of the SFP optical module that is used for Optical Fiber Transmission non-compression video signal.SFP (small form pluggable) light module package--the little package module of hot plug, flank speed can reach 10G at present, adopts the LC interface more.A kind of SFP optical module that is used for Optical Fiber Transmission non-compression video signal comprises light emission secondary module 10, light-receiving secondary module 20, optical sender control circuit 30, optical receiver control circuit 40 and microcontroller 50.
Optical sender control circuit 30 adopts direct-current coupling to light emission secondary module 10, is used to control the luminance of light emission secondary module 10.
Optical sender control circuit 30 comprises laser drive circuit 302, DC coupling circuit 304 and filter circuit 306.
Optical receiver control circuit 40 adopts and is capacitively coupled to light-receiving secondary module 20, is used to receive the signal of telecommunication of light-receiving secondary module 20 and for light-receiving secondary module 20 operating voltage is provided.
Optical receiver control circuit 40 comprises amplitude limiting amplifier circuit 402 and APD booster circuit 404.The APD booster circuit loop that high light of the direct FEEDBACK CONTROL of optical receiver control circuit and low light are formed
Amplitude limiting amplifier circuit 402 and APD booster circuit 404 are connected with light-receiving secondary module 20, and amplitude limiting amplifier circuit 402 is used to recover the signal of telecommunication of the ultralow frequency cut-off frequency of light-receiving secondary module 20 outputs.APD booster circuit 404 is used for normal operating voltage to light-receiving secondary module 20 being provided.APD booster circuit 404 also is connected with microcontroller 50, and microcontroller 50 is used to control the output voltage of APD booster circuit 404.
Light emission secondary module 10 all belongs to light delivery module with light-receiving secondary module 20.Light delivery module is divided into single-mode optics transport module and multimode light delivery module.Then comprise optical secondary module (Optical Subassembly from the differentiation of integral product framework; OSA) and electronics secondary module (Electrical Subassembly; ESA) two large divisions.
The making flow process of optical secondary module is roughly following: part at first of heap of stone brilliant be with GaAs (GaAs), indium phosphide (InP), InGaAsP (InGaAs) etc. as luminous with examine luminescent material, utilize organic metal vapour deposition process (Metal-Organic Chemical Vapor Deposition; MOCVD) etc. mode is processed wafer of heap of stone.In the chip processing procedure, then will build wafer, process laser diode.With laser diode, assemblies such as collocation filter, crown cap are packaged into TO can (Transmitter Outline can), again with assemblies such as this TO can and porcelain bushings, are packaged into optical secondary module (OSA) subsequently.
Optical secondary module can be subdivided into light emission secondary module 10 (TOSA, Transmitter Optical Subassembly) and light-receiving secondary module 20 (ROSA, Receiver Optical Subassembly) again.
In the present embodiment, the diode that light-receiving secondary module 20 adopts in manufacturing process is PIN photodiode (positive-intrinsic negative diode, PIN diode) or avalanche photodide.
Light-receiving secondary module 20 also comprises trans-impedance amplifier; Amplitude limiting amplifier circuit 402 is connected with trans-impedance amplifier in the light-receiving secondary module 20; Be used to recover the signal of telecommunication of the trans-impedance amplifier output of light-receiving secondary module 20; APD booster circuit 404 connects light-receiving secondary module 20, is used to provide normal working voltage to light-receiving secondary module 20.Wherein, in order to guarantee to transmit ultra-low frequency signal, improve transmission bandwidth, trans-impedance amplifier adopts low cut-off frequency, and the trans-impedance amplifier low-frequency cut-off frequency of selecting for use generally speaking need be 1KHz, and maximum is no more than 2KHz.
Trans-impedance amplifier is a kind of of amplifier type, and the amplifier type is that the type according to its input/output signal defines.In electrical domain, suppose amplifier gain A=Y/X, Y is output, X is input.Because characterizing a signal and be not with voltage is exactly electric current, so make up four kinds of amplifiers is just arranged, when being input as current signal, when being output as voltage signal, A=Y (voltage)/X (electric current) then has the dimension of resistance, so be referred to as trans-impedance amplifier.
Optical sender control circuit 30 adopts direct-current coupling to light emission secondary module 10, the high-pass filtering performance of avoiding AC coupled to form.Filter circuit 306 can strengthen the ill signal handling capacity of optical sender control circuit 30 simultaneously, and optical sender control circuit 30 can pass through to regulate the resistance of direct-current coupling build-out resistor, thereby improves eye diagram quality.
Optical receiver control circuit 40 adopts big coupling capacitance 4.7uF in order to guarantee the transmittability of low frequency signal, has so both reduced the high-pass filtering characteristic of AC coupled in the transmission, guarantees the regular path of low frequency signal again.
Amplitude limiting amplifier circuit 402 can suppress the variation at a slow speed of data signal amplitude, and the amplitude that also can suppress signal comparatively fast changes.There is not the time constant problem in the gain-controlled amplifier.The basic structure of amplitude limiting amplifier circuit 402 comprises a series of difference amplifying unit and a dc feedback loop.The nonlinear device of current amplifier and so on is usually used in amplitude limiting amplifier circuit 402.When adopting FET to constitute differential amplifier, its basic circuit form is a source-coupled FET logical circuit.In the present embodiment, amplitude limiting amplifier circuit 402 is mainly used in the output signal of telecommunication of the trans-impedance amplifier that recovers ultralow low-frequency cut-off frequency, and it is amplified.
The avalanche diode that APD booster circuit 404 connects in the light-receiving secondary module 20 also is connected with microcontroller 50, and microcontroller 50 is used to control the pressure drop size of APD booster circuit 404 outputs.
In the present embodiment, microcontroller 50 is that major part with microcomputer is integrated in a single-chip microcomputer on the chip.Microcontroller 50 is through emission chip for driving and optical receiver control circuit 40 in the Simulation with I 2C host computer control light emission secondary module 10.In order to guarantee the transmission of ill signal; Microcontroller 50 is through I2C Control on Communication drive circuit for laser 302; Microcontroller 50 in the rising edge of data-signal, the time that is provided with of trailing edge adjustment PD, adopts single closed loop APC loop to adapt to ill signal transmission through software.Microcontroller 50 is through the decimation factor of software setting P1 loop and P0 loop; 1 level of P1 representative, what P0 represented is 0 level, ill signal mainly is 19 1 and follows one 0; Perhaps follow one 0 for 19 1; Strengthen the ability that adapts to ill signal through software setting adjustment decimation factor, make under the continuous level state RST of transmission, can guarantee that laser is normally luminous, the situation that superpower light or ultralow light also can not occur influences the judgement of signal condition.Microcontroller 50 is adjusted single closed loop low pass filter (low pass filter) through software, increases whole emission system bandwidth, helps the low frequency signal transmission.
The optical sender control circuit adopts direct-current coupling to light emission secondary module and to strengthen ill Signal Processing ability through filter circuit filtering in the above-mentioned SFP optical module; The optical receiver control circuit then adopts capacitive coupling can increase transmission bandwidth; And the low-frequency filter of avoiding receiving coupling circuit formation stops low frequency signal to pass through, thereby the appearance that effectively solves the ill signal in the transmission of video signals.
In the present embodiment, the SFP optical module comprises the packing forms that two fine transmitting-receivings, two, two receipts, single-shot list are received.
Based on above-mentioned all embodiment, be illustrated in figure 2 as the structural representation that the SFP optical module adopts two fine transmitting-receivings.Diode in the light emission secondary module 10 adopts laser diode, and laser diode is connected with laser drive circuit 302 in the optical sender control circuit 30.Diode in the light-receiving secondary module 20 adopts avalanche diode, and avalanche diode is connected with APD booster circuit 404 in the optical receiver control circuit 40.Trans-impedance amplifier in the light-receiving secondary module 20 is connected with amplitude limiting amplifier circuit 402 in the optical receiver control circuit 40.Microcontroller 50 is used to monitor APD booster circuit 404 and amplitude limiting amplifier circuit 402.
Be illustrated in figure 3 as the SFP optical module and adopt two fine two structural representations of sending out.The SFP optical module comprises that the diode in 10, two light emissions of two light emission secondary module secondary module 10 all adopts laser diode, laser diode all with optical sender control circuit 30 in laser drive circuit 302 be connected.
Be illustrated in figure 4 as the SFP optical module and adopt two fine two structural representations of receiving.The SFP optical module comprises that the diode in 20, two light-receiving secondary modules 20 of two light-receiving secondary modules all adopts avalanche diode, avalanche diode all with optical receiver control circuit 40 in APD booster circuit 404 be connected.Trans-impedance amplifier in the light-receiving secondary module 20 is connected with amplitude limiting amplifier circuit 402 in the optical receiver control circuit 40.Microcontroller 50 is used to monitor APD booster circuit 404 and amplitude limiting amplifier circuit 402.
Be illustrated in figure 5 as the structural representation that the SFP optical module adopts the single fiber single-shot.The SFP optical module includes only light emission secondary module 10, and the diode in the light emission secondary module 10 adopts laser diode, and laser diode is connected with laser drive circuit 302 in the optical sender control circuit 30.
Be illustrated in figure 6 as the structural representation that the SFP optical module adopts the single fiber list to receive.The SFP optical module includes only a light-receiving secondary module 20, and diode in the light-receiving secondary module 20 adopts avalanche diode, and avalanche diode is connected with APD booster circuit 404 in the optical receiver control circuit 40.Trans-impedance amplifier in the light-receiving secondary module 20 is connected with amplitude limiting amplifier circuit 402 in the optical receiver control circuit 40.Microcontroller 50 is used to monitor APD booster circuit 404 and amplitude limiting amplifier circuit 402.
Optical receiver control circuit 40 adopts 4.7uF to be capacitively coupled to light-receiving secondary module 20.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (6)
1. a SFP optical module that is used for Optical Fiber Transmission non-compression video signal is characterized in that, said SFP optical module comprises light-receiving secondary module, light emission secondary module, optical sender control circuit, optical receiver control circuit and microcontroller;
Said optical sender control circuit adopts direct-current coupling to said light emission secondary module, is used to control the luminance of said light emission secondary module; Said optical sender control circuit comprises laser drive circuit, DC coupling circuit and filter circuit; Said laser drive circuit is connected with said light emission secondary module, said DC coupling circuit and said filter circuit; Said laser drive circuit comprises laser driver, and being used for provides drive current to said light emission secondary module; Said laser driver is connected with said microcontroller, and said microcontroller is used to control and monitor the output current of said laser driver;
Said optical receiver control circuit adopts and is capacitively coupled to said light-receiving secondary module, is used to receive the signal of telecommunication of light-receiving secondary module and operating voltage is provided for the light-receiving secondary module; Said optical receiver control circuit comprises amplitude limiting amplifier circuit and APD booster circuit; Said amplitude limiting amplifier circuit and said APD booster circuit are connected with said light-receiving secondary module; Said amplitude limiting amplifier circuit is used to recover the signal of telecommunication of the ultralow frequency cut-off frequency of said light-receiving secondary module output; Said APD booster circuit is used for normal operating voltage to the light-receiving secondary module being provided; Said APD booster circuit also is connected with said microcontroller, and said microcontroller is used to control the output voltage of said APD booster circuit.
2. the SFP optical module that is used for Optical Fiber Transmission non-compression video signal according to claim 1 is characterized in that said light-receiving secondary module is PIN photodiode or avalanche photodide.
3. the SFP optical module that is used for Optical Fiber Transmission non-compression video signal according to claim 1; It is characterized in that; Said light-receiving secondary module also comprises trans-impedance amplifier, and said amplitude limiting amplifier circuit is connected with trans-impedance amplifier in the light-receiving secondary module, is used to recover the signal of telecommunication of the trans-impedance amplifier output of said light-receiving secondary module; Said APD booster circuit connects the light-receiving secondary module, is used to provide normal working voltage to the light-receiving secondary module.
4. the SFP optical module that is used for Optical Fiber Transmission non-compression video signal according to claim 1 is characterized in that, the APD booster circuit loop that high light of the direct FEEDBACK CONTROL of said optical receiver control circuit and low light are formed.
5. the SFP optical module that is used for Optical Fiber Transmission non-compression video signal according to claim 1 is characterized in that, said SFP optical module comprises the packing forms that two fine transmitting-receivings, two, two receipts, single-shot list are received.
6. the SFP optical module that is used for Optical Fiber Transmission non-compression video signal according to claim 1 is characterized in that said optical receiver control circuit adopts 4.7 microfarads to be capacitively coupled to the light-receiving secondary module.
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| CN201210237009.5A CN102801967B (en) | 2012-07-10 | 2012-07-10 | SFP (System File Protection) optical module for transferring non-compressed video signal |
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| CN201210237009.5A CN102801967B (en) | 2012-07-10 | 2012-07-10 | SFP (System File Protection) optical module for transferring non-compressed video signal |
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| CN102801967B CN102801967B (en) | 2017-02-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103391137A (en) * | 2013-08-22 | 2013-11-13 | 成都新易盛通信技术股份有限公司 | 1*9 low-rate optical module with DDM (data distribution management) function |
| CN104270203A (en) * | 2014-10-24 | 2015-01-07 | 成都新易盛通信技术股份有限公司 | SFF double-light-emitting module with DDM function and optical communication system |
| CN104301698A (en) * | 2014-10-23 | 2015-01-21 | 深圳市易飞扬通信技术有限公司 | Optical cable interface system for transmitting HDMI signals |
| CN106412499A (en) * | 2016-09-14 | 2017-02-15 | 芜湖扬展新材料科技服务有限公司 | Communication transmission system for non-compressive digital video monitoring device |
| CN107306155A (en) * | 2016-04-20 | 2017-10-31 | 成都芯瑞科技股份有限公司 | 1 × 9 Ultra-Low Speed extra long distance optical module |
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| US20060198639A1 (en) * | 2005-03-07 | 2006-09-07 | Giorgio Giaretta | High speed SFP transceiver |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391137A (en) * | 2013-08-22 | 2013-11-13 | 成都新易盛通信技术股份有限公司 | 1*9 low-rate optical module with DDM (data distribution management) function |
| CN104301698A (en) * | 2014-10-23 | 2015-01-21 | 深圳市易飞扬通信技术有限公司 | Optical cable interface system for transmitting HDMI signals |
| CN104270203A (en) * | 2014-10-24 | 2015-01-07 | 成都新易盛通信技术股份有限公司 | SFF double-light-emitting module with DDM function and optical communication system |
| CN107306155A (en) * | 2016-04-20 | 2017-10-31 | 成都芯瑞科技股份有限公司 | 1 × 9 Ultra-Low Speed extra long distance optical module |
| CN106412499A (en) * | 2016-09-14 | 2017-02-15 | 芜湖扬展新材料科技服务有限公司 | Communication transmission system for non-compressive digital video monitoring device |
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