CN201282467Y - Single fiber three-way module - Google Patents
Single fiber three-way module Download PDFInfo
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- CN201282467Y CN201282467Y CN 200820174180 CN200820174180U CN201282467Y CN 201282467 Y CN201282467 Y CN 201282467Y CN 200820174180 CN200820174180 CN 200820174180 CN 200820174180 U CN200820174180 U CN 200820174180U CN 201282467 Y CN201282467 Y CN 201282467Y
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- single fiber
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- way module
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Abstract
The utility model discloses a triplexer module which comprises a triplexer optical module, a digital transmitter circuit connected with the emission port of the optical module, and a digital receiver circuit connected with the digital receiving port of the optical module, and an analog receiver circuit connected with the analog receiving port of the three-dimensional optical module, and comprising a radio-frequency amplifying circuit and an MOCA filter; and the video signals received by the triplexer optical module is filtered by the MOCA filter and output by the video output terminal of the triplexer module after being amplified by the radio-frequency amplifying circuit. The triplexer module of the utility model can simultaneously transmit analog signals and digital signals, thereby realizing the three-business functions of the single-fiber transmission.
Description
Technical field
The utility model relates to a kind of optical module, specifically, relates to the single fiber three-way module in a kind of gigabit passive optical network, belongs to the optical communication technique field.
Background technology
Along with the continuous development of Fibre Optical Communication Technology, people are more and more higher to the demand of optical fiber.Should be used for from present market, more and more trend towards with a large bandwidth and at a high rate the optical fiber communication of merging with multiple business.In numerous solutions, the appearance that Fiber to the home (FTTH) is considered to the ultimate solution of broadband access.And in the numerous schemes of FTTH, can realize that the gigabit passive optical network (GPON) of the above access rate of 1Gbit/s receives much concern.GPON carries out standardization effort by ITU, and main target is an access rate of realizing that 1Gbit/s is above.The frame structure of GPON is not based on the form of any specified type, but a kind of encapsulation based on the original form of various subscriber signals, so GPON has bigger advantage at aspects such as bandwidth availability ratio and business supports.
What existing GPON client was commonly used is the single fiber bi-directional module, by single fiber bi-directional optical assembly and connected transmitter circuitry and receiver circuit, can realize the function of digital transmission and digital received.Along with the continuous progress of digital technology, software engineering and IP agreement, the integration of three networks technology that telecommunications network, computer network and cable television network three macroreticulars are merged mutually becomes the current main direction of Informatization Development from now on that reaches.Traditional single fiber bi-directional module is because can not transmission of analogue signal, thereby limited the development and the application of GPON field integration of three networks technology.
Summary of the invention
The utility model at gigabit passive optical network single fiber bi-directional module in the prior art can not transmission of analogue signal deficiency, a kind of single fiber three-way module is provided, by the analog receiver circuit is set in module, make and module transmission of analogue signal and digital signal have simultaneously realized that single fiber transmits the function of three kinds of business.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of single fiber three-way module, digital transmission machine circuit that comprise the three-dimensional optical assembly, is connected and the digital received machine circuit that is connected with the digital received port of described optical assembly with the emission port of described optical assembly, it is characterized in that, also comprise the analog receiver circuit, described analog receiver circuit is connected with the simulation receiving port of described three-dimensional optical assembly; Described analog receiver circuit comprises radio frequency amplifying circuit and MOCA filter, and the vision signal that described three-dimensional optical assembly receives again through described MOCA filter filtering, is exported by the video output terminals of three-dimensional module after described radio frequency amplifying circuit amplifies then.
According to the utility model, described analog receiver circuit also comprises automatic gain control circuit, described automatic gain control circuit input detects simulation received optical power signal, and outputing gain control signal is to described radio frequency amplifying circuit, in order to regulate the gain of described radio frequency amplifying circuit.
According to the utility model, described automatic gain control circuit adopts microprocessor to realize.
According to the utility model, described three-dimensional module also comprises supervisory circuit, described supervisory circuit monitoring modular temperature, supply power voltage, bias current and emission luminous power and received optical power parameter, and export corresponding monitor signal.Described supervisory circuit meets the SFF-8472 standard.
According to the utility model, described module is provided with bus interface, and described supervisory circuit is by described bus interface transmission of monitoring signal.
Preferably, described bus interface is I
2The C bus interface.
According to the utility model, described digital received machine circuit and analog receiver circuit also include temperature-compensation circuit, described temperature-compensation circuit comprises reference resistance and at least one thermistor, be in series with described reference resistance behind the described thermistor two ends adjusting in parallel resistance, form the series connection temperature-compensation circuit.
According to the utility model, described temperature-compensation circuit comprises three thermistors, wherein, connects with second thermistor after resistance is regulated at the first thermistor two ends in parallel first, forms first parallel branch; It is in parallel that described first parallel branch and second is regulated resistance, forms first series arm; Described first series arm and the 3rd thermistor and reference resistance are in series, and form the series connection temperature-compensation circuit.
According to the utility model, described digital transmission machine circuit comprises the emission warning circuit, and described emission warning circuit is at outputting alarm signal when unusual that transmits; Described digital received machine circuit comprises the receiving alarm circuit, and described receiving alarm circuit is the outputting alarm signal when the digital received abnormal signal.
Compared with prior art, advantage of the present utility model and good effect are:
1, the analog receiver circuit is set in module, utilizes a wavelength of three-dimensional module to receive the vision signal of automatic network, after radio frequency amplifying circuit in the analog receiver circuit and the MOCA filter process, realize reception vision signal.
2, by in the analog receiver circuit, automatic gain control circuit being set, can compensate the variation that changes the vision signal output that causes because of input optical power, reduce to change the harmful effect that system applies is produced because of vision signal output.
3, utilize the supervisory circuit that is provided with in the module, the network system management unit is temperature, supply power voltage, bias current and the emission luminous power and the received optical power of monitoring modular in real time, realizes the numerical diagnostic function.System Management Unit can be found out the position whether fibre system breaks down and break down in time, easily according to the signal of supervisory circuit output, simplified system maintenance work, the reliability of raising system.
4, form temperature-compensation circuit by thermistor and the connection in series-parallel of regulating resistance and reference resistance, can carry out accurate, stable temperature-compensating to module, guarantee the steady operation of technical grade temperature (40 to 85 ℃) lower module, and the cost of temperature-compensation circuit is lower, realizes easily.
Description of drawings
Fig. 1 is the internal circuit theory diagram of an embodiment of the utility model single fiber three-way module;
Fig. 2 is a functional block diagram of realizing automatic gain control in Fig. 1 analog receiver circuit;
Fig. 3 adopts microprocessor to realize the schematic diagram of automatic gain control circuit;
Fig. 4 is the circuit theory diagrams of temperature-compensation circuit among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
See also the internal circuit theory diagram of an embodiment of single fiber three-way module shown in Figure 1, described single fiber three-way module comprises three-dimensional optical assembly I, the digital transmitter circuit I I that is connected with the emission port of described three-dimensional optical assembly I, the digital receiver circuit I II that is connected with the digital received port of three-dimensional optical assembly I, analog receiver circuit I V, the supervisory circuit V that is used for the monitoring module parameter and the temperature-compensation circuit VI that are connected with the simulation receiving port of three-dimensional optical assembly I.
Described three-dimensional optical assembly I is the core devices in the three-dimensional module, mainly finishes the required photosignal conversion of wave splitting/composing and module, includes three wavelength, is respectively 1310nm, 1490nm and 1555nm.Wherein, the upstream digital radiating portion adopts 1310nm to carry out the signal emission, and descending digital received partly adopts the 1490nm receiving digital signals, and the analog receiving signal end adopts 1555nm to receive analog signal.
Forward direction transmission input and the back emitted input of GPON uplink burst mode digital transmitter circuitry II receive respectively from the armed signal of telecommunication of client, through the 1310nm digital transmission end output drive signal of the burst mode actuator electrical road direction three-dimensional optical assembly I of inside, and utilize three-dimensional optical assembly I that armed electrical signal conversion is launched for light signal.Because transmitter circuitry II is operated under the burst mode, require module to have the function of quick On/Off, described transmitter circuitry II is provided with transmitter and enables the control signal port, and the GPON system is by described port transmission LD bias current control signal, and promptly transmitter enables control signal.When the needs module was luminous, the GPON systems control division was given described port and is sent an opening signal, makes the bias current of LD be in more than the threshold current, and module is sent normal modulated light signal to GPON system local side; When systems control division was given cut-off signals of port transmission, module stopped to send light signal to local side.In addition, described transmitter circuitry II also comprises the emission warning circuit, is transmitting and is launching driver outputting alarm signal when unusual.
Described descending digital receiver circuit I II receives the signal of telecommunication of the digital received signal correspondence of three-dimensional optical assembly I output by the 1490nm wavelength, and by after the amplification of limiting amplifier amplitude limit, exports by the received signal output.Digital receiver circuit I II includes the receiving alarm circuit, and when the signal of telecommunication amplitude of three-dimensional optical assembly I output was lower than the sensitivity of receiver circuit III, thinking did not have the light signal input module, by alarm signal of receiver alarm signal end output.
Described analog receiver circuit I V receives the vision signal of automatic network by the 1555nm wavelength, after radio frequency amplifying circuit and MOCA filter process, and the vision signal that receives by video output terminals output.In addition, for, the variation of the vision signal output that compensation causes because of input optical power changes also is provided with automatic gain control circuit in described analog receiver circuit I V, to reduce changing the harmful effect that system applies is produced because of vision signal output.
Because the GPON network system requires relatively stricter, need the three-dimensional module in the network to have the numerical diagnostic function, therefore, present embodiment three-dimensional module is provided with the supervisory circuit V that meets the SFF-8472 standard, is used for monitoring temperature, power supply voltage, bias current and the emission luminous power and the received optical power of whole module.Described supervisory circuit is with the I of monitor data by module
2C bus interface data line and clock line export in the GPON System Management Unit, for System Management Unit analysis, utilization and storage.System Management Unit can judge according to the monitor data that receives whether system is unusual, and finds out the position that fault takes place in the optical fiber link when system exception like a cork, thereby has simplified system maintenance work, improves the reliability of system.
In addition, present embodiment is for the consideration to temperature stability, be provided with temperature-compensation circuit in inside modules, digital receiver circuit III and analog receiver circuit I V are carried out temperature-compensating, to guarantee its steady operation in technical grade temperature (40 degrees centigrade to 85 degrees centigrade) scope.
Figure 2 shows that the functional block diagram of realizing automatic gain control in the analog receiver circuit, Fig. 3 then shows the schematic diagram that adopts microprocessor to realize automatic gain control circuit.As shown in Figures 2 and 3, microprocessor U1 is by the video optical power signals VIDEO_OPTO_MON of monitoring pin MON monitoring 1550nm wavelength output, after inter-process, to radio frequency amplifying circuit, the gain of regulating radio frequency amplifying circuit is to reach best radio frequency output effect by digital-to-analogue conversion pin DAC output automatic gaining controling signal AGC_CONTROL.For improving the precision of automatic gain control, microprocessor U1 can also monitor the radio frequency output signal RF_MON of radio frequency amplifying circuit as feedback signal by monitoring pin MON, after U1 handles, export automatic gaining controling signal with video optical power signals VIDEO_OPTO_MON.In addition, the present embodiment microprocessor can also be by digital-to-analogue conversion pin DAC output automatic gain shifted signal AGC_OFFSET, and this signal at clear uses to the user, and the user is the final radio frequency output amplitude of adjusting module as required.
Fig. 4 shows a kind of circuit theory diagrams of temperature-compensation circuit, and described temperature-compensation circuit comprises three thermistors, connects with the second thermistor Rt2 after resistance R p1 is regulated at the first thermistor Rt1 two ends in parallel first, forms first parallel branch; It is in parallel that described first parallel branch and second is regulated resistance R p2, forms first series arm; Described first series arm and the 3rd thermistor Rt3 and reference resistance Rs are in series, and form the series connection temperature-compensation circuit.Wherein, first series arm that includes the first thermistor Rt1 and the second thermistor Rt2 is used for realizing the high temperature compensation, and the 3rd thermistor Rt3 is used for realizing low temp compensating.Adopt this three thermistors and regulate the circuit that resistance is formed, can obtain very linear compensated curve by simulation calculation, described adjusting resistance can change the slope of compensated curve, generally the calculating by theory can obtain a value roughly, and more accurate calculating needs to carry out actual debugging according to the APD and the PD of concrete module application.After curve is determined, move up and down curve by the resistance that changes reference resistance Rs, realize the temperature-compensating accurate and stable, and circuit structure is simple to module, cost is lower, is easy to realize.
In addition, described temperature-compensation circuit also can only comprise a thermistor, is parallel with adjusting resistance at two ends, reference resistance on connecting on the parallel branch of thermistor and adjusting resistance composition.Various combination by thermistor and adjusting resistance can produce the compensated curve that needs.
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 (10)
1, a kind of single fiber three-way module, digital transmission machine circuit that comprise the three-dimensional optical assembly, is connected and the digital received machine circuit that is connected with the digital received port of described optical assembly with the emission port of described optical assembly, it is characterized in that, also comprise the analog receiver circuit, described analog receiver circuit is connected with the simulation receiving port of described three-dimensional optical assembly; Described analog receiver circuit comprises radio frequency amplifying circuit and MOCA filter, and the vision signal that described three-dimensional optical assembly receives again through described MOCA filter filtering, is exported by the video output terminals of three-dimensional module after described radio frequency amplifying circuit amplifies then.
2, single fiber three-way module according to claim 1, it is characterized in that, described analog receiver circuit also comprises automatic gain control circuit, described automatic gain control circuit input detects simulation received optical power signal, and outputing gain control signal is to described radio frequency amplifying circuit, in order to regulate the gain of described radio frequency amplifying circuit.
3, single fiber three-way module according to claim 2 is characterized in that, described automatic gain control circuit adopts microprocessor to realize.
4, according to each described single fiber three-way module in the claim 1 to 3, it is characterized in that, also comprise supervisory circuit, described supervisory circuit monitoring modular temperature, supply power voltage, bias current and emission luminous power and received optical power parameter, and export corresponding monitor signal.
5, single fiber three-way module according to claim 4 is characterized in that, described module is provided with bus interface, and described supervisory circuit is by described bus interface transmission of monitoring signal.
6, single fiber three-way module according to claim 5 is characterized in that, described bus interface is I
2The C bus interface.
7, single fiber three-way module according to claim 4 is characterized in that, described supervisory circuit meets the SFF-8472 standard.
8, single fiber three-way module according to claim 1, it is characterized in that, described digital received machine circuit and analog receiver circuit also include temperature-compensation circuit, described temperature-compensation circuit comprises reference resistance and at least one thermistor, be in series with described reference resistance behind the described thermistor two ends adjusting in parallel resistance, form the series connection temperature-compensation circuit.
9, single fiber three-way module according to claim 8 is characterized in that, described temperature-compensation circuit comprises three thermistors, wherein, connects with second thermistor after resistance is regulated at the first thermistor two ends in parallel first, forms first parallel branch; It is in parallel that described first parallel branch and second is regulated resistance, forms first series arm; Described first series arm and the 3rd thermistor and reference resistance are in series, and form the series connection temperature-compensation circuit.
10, single fiber three-way module according to claim 1 is characterized in that, described digital transmission machine circuit comprises the emission warning circuit, and described emission warning circuit is at outputting alarm signal when unusual that transmits; Described digital received machine circuit comprises the receiving alarm circuit, and described receiving alarm circuit is the outputting alarm signal when the digital received abnormal signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820174180 CN201282467Y (en) | 2008-10-29 | 2008-10-29 | Single fiber three-way module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820174180 CN201282467Y (en) | 2008-10-29 | 2008-10-29 | Single fiber three-way module |
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| CN201282467Y true CN201282467Y (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200820174180 Expired - Lifetime CN201282467Y (en) | 2008-10-29 | 2008-10-29 | Single fiber three-way module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105812755A (en) * | 2015-11-26 | 2016-07-27 | 成都广达新网科技股份有限公司 | Video signal and digital signal simultaneous transmission real-time monitoring system and working method of the system |
| CN108390720A (en) * | 2017-02-03 | 2018-08-10 | 宏观微电子股份有限公司 | Semiconductor chip |
-
2008
- 2008-10-29 CN CN 200820174180 patent/CN201282467Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105812755A (en) * | 2015-11-26 | 2016-07-27 | 成都广达新网科技股份有限公司 | Video signal and digital signal simultaneous transmission real-time monitoring system and working method of the system |
| CN108390720A (en) * | 2017-02-03 | 2018-08-10 | 宏观微电子股份有限公司 | Semiconductor chip |
| CN114866146A (en) * | 2017-02-03 | 2022-08-05 | 宏观微电子股份有限公司 | Semiconductor chip |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090729 |
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| CX01 | Expiry of patent term |