CN201315587Y - Single-fiber three-dimensional module - Google Patents
Single-fiber three-dimensional module Download PDFInfo
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- CN201315587Y CN201315587Y CNU2008201750043U CN200820175004U CN201315587Y CN 201315587 Y CN201315587 Y CN 201315587Y CN U2008201750043 U CNU2008201750043 U CN U2008201750043U CN 200820175004 U CN200820175004 U CN 200820175004U CN 201315587 Y CN201315587 Y CN 201315587Y
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Abstract
The utility model discloses a single-fiber three-dimensional module, comprising a three-dimensional optical assembly, a digital transmitter circuit connected with the transmitting port of the optical assembly, a digital receiver circuit which is connected with the digital receive port of the optical assembly, and an analog receiver circuit, wherein the analog receiver circuit is connected with the analog receive port of the optical assembly; the analog receiver circuit comprises a radio frequency amplifier and an automatic gain control circuit; the video signal received by the three-dimensional optical assembly is amplified by the radio frequency amplifier, and then is output by the video output terminal of the three-dimensional optical assembly; the input terminal of the automatic gain control circuit detects the analog receiver optical power signal, and outputs the gain control signal to the radio frequency amplifier to adjust the gain of the radio frequency amplifier, thus realizing the function of the single-fiber transmission of digital signal and analog signal in the Ether passive optical network.
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 ethernet 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 the broadband access scheme of FTTP (FTTP), the main network technology of using is ethernet passive optical network (EPON) or gigabit passive optical network (GPON).Wherein, EPON combines the transmission structure of the ether technology of simple economy and EPON (PON), adopts single ethernet frame transmission multiple business, therefore uses comparatively extensive at optical communication field.
What use always among the existing EPON 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 EPON field integration of three networks technology.
Summary of the invention
The utility model at ethernet 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, realized the function of three kinds of business of single fiber transmission.
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 amplifier and automatic gain control circuit, and the vision signal that described three-dimensional optical assembly receives is after described radio frequency amplifier amplifies, by the video output terminals output of three-dimensional module; Described automatic gain control circuit input detects simulation received optical power signal, and outputing gain control signal is to described radio frequency amplifier, in order to regulate the gain of described radio frequency amplifier.
According to the utility model, described automatic gain control circuit comprises first comparator, the first input end of described first comparator connects described simulation received optical power signal, second input of described first comparator is connected with the output of described comparator by first potential-divider network, the output output automatic gaining controling signal of described first comparator.
According to the utility model, described analog receiver circuit also comprises the simulation power supply, and described simulation power supply is connected with the first input end of described first comparator by second potential-divider network, and the automatic gaining controling signal of exporting for output provides bias voltage; Described simulation power supply is a direct current 12V power supply.
According to the utility model, described analog receiver circuit also comprises simulation receiving alarm circuit, and described warning circuit detects simulation received optical power signal, and at described optical power signals outputting alarm signal during less than set point.
According to the utility model, described simulation receiving alarm circuit comprises second comparator, an input of described second comparator connects described simulation received optical power signal, another input connects reference signal, and the output of described second comparator is exported corresponding alarm signal during less than reference signal at described simulation received optical power signal.
According to the utility model, described three-dimensional module comprises that the transmission of digital transmitter enables the port of control signal, and described port is connected with described digital transmission machine 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 digital received warning circuit, and described digital received warning 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, the radio frequency amplifier in the analog receiver circuit is handled back output, and realization is to the reception of vision signal; By in the analog receiver circuit, automatic gain control circuit being set, in order to adjust the gain of radio frequency amplifier, 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.
2, by simulation receiving alarm circuit is set in above-mentioned analog receiver circuit, when the simulated light power signal that receives is more weak, can the outputting alarm signal, make things convenient for the monitoring of system to analog receiving signal.
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 the functional block diagram of analog receiver circuit among Fig. 1;
Fig. 3 is the circuit diagram of a kind of execution mode of automatic gain control circuit;
Fig. 4 is the circuit diagram of a kind of execution mode of simulation receiving alarm 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 and the analog receiver circuit I V that is 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.
The input that transmits of EPON uplink burst mode digital transmitter circuitry II+/-receive from the armed differential electric signal 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 EPON system is by described port transmission LD bias current control signal, and promptly transmitter enables control signal.During work, system subscriber terminal with armed differential electric signal transfer to the input that transmits+/-, utilize then enable control signal+/-control laser driver whether to send signal.If enable, then driver is changed the signal of telecommunication, by the 1310nm digital transmission end of three-dimensional optical assembly I signal is launched then.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 is by 1490nm receiving terminal receiving digital signals, converts the voltage signal of enough amplitudes to by preamplifier, and then is processed into the signal of constant amplitude through limiting amplifier, and by the output of received signal output.Digital receiver circuit I II also 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 receiving terminal, after radio frequency amplifier is handled, and the vision signal that receives by VT output.In addition, for compensating the variation that changes the vision signal output that causes because of input optical power, in described analog receiver circuit I V, also be provided with automatic gain control circuit, in order to adjust the gain of described radio frequency amplifier, to reduce changing the harmful effect that system applies is produced because of vision signal output.
Fig. 2 is the functional block diagram of the circuit I of analog receiver described in Fig. 1 V, and wherein, radio frequency amplifier includes a plurality of amplifiers, to realize automatic gain control.The photoelectric detector PD pipe of simulation receiving terminal produces a corresponding response voltage of simulated light power signal with reception, in the reference optical power of work, automatic gain control circuit produces linear, that satisfy the radio frequency amplifier demand relatively automatic gaining controling signal according to described response voltage, adjusts the gain of radio frequency amplifier.Simultaneously, if the simulated light power signal that receives hour, the amplitude of vision signal output also can be very little, therefore, by simulation receiving alarm electric circuit inspection described response voltage signal, and during less than set point, export an alarm signal in the optical power signals that receives.
Fig. 3 is the circuit diagram of a kind of execution mode of described automatic gain control circuit.Described automatic gain control circuit comprises the first comparator U7, and simulation received optical power signal VIDEO_OPTO_MON is that in-phase input end+IN is connected by resistance R 73 and the first input end of U7; Second input of U1 is that first potential-divider network that inverting input-IN forms by resistance R 64, R63 and capacitor C 53 is connected with the output OUT end of U1; Automatic gaining controling signal AGC_CONTROL then exports by the output OUT end of U1.In addition, the simulation power supply VCC_VIDEO of+12V by resistance R 76, R78, and second potential-divider network formed of R75 and U1+IN holds and is connected, for automatic gaining controling signal AGC_CONTROL provides a suitable bias voltage.
In foregoing circuit, simulation received optical power signal VIDEO_OPTO_MON is of producing of photoelectric detector PD pipe and the corresponding response voltage signal of simulated light power signal of reception.This signal produces linear, that satisfy a radio frequency amplifier demand relatively automatic gaining controling signal AGC_CONTROL after U7 handles, be used for adjusting the gain of radio frequency amplifier.
Fig. 4 is the circuit diagram of a kind of execution mode of described simulation receiving alarm circuit.Described warning circuit comprises the second comparator U2, the input of U2-IN connects simulation received optical power signal VIDEO_OPTO_MON, and transmitter power supply TX_VCC produces another input+IN that a reference voltage signal inputs to U2 by the potential-divider network that resistance R 23 and R24 form.Described simulation received optical power signal VIDEO_OPTO_MON is of producing of photoelectric detector PD pipe and the corresponding response voltage signal of simulated light power signal of reception.U2 compares the response voltage signal of input with above-mentioned reference voltage, and at simulation received optical power signal less than certain set point, during as-15dBm, export a TTL high level alarm signal VIDEO_SD by the output OUT end of U2.
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 amplifier and automatic gain control circuit, and the vision signal that described three-dimensional optical assembly receives is after described radio frequency amplifier amplifies, by the video output terminals output of three-dimensional module; Described automatic gain control circuit input detects simulation received optical power signal, and outputing gain control signal is to described radio frequency amplifier, in order to regulate the gain of described radio frequency amplifier.
2, single fiber three-way module according to claim 1, it is characterized in that, described automatic gain control circuit comprises first comparator, the first input end of described first comparator connects described simulation received optical power signal, second input of described first comparator is connected with the output of described comparator by first potential-divider network, the output output automatic gaining controling signal of described first comparator.
3, single fiber three-way module according to claim 1, it is characterized in that, described analog receiver circuit also comprises the simulation power supply, described simulation power supply is connected with the first input end of described first comparator by second potential-divider network, and the automatic gaining controling signal of exporting for output provides bias voltage.
4, single fiber three-way module according to claim 3 is characterized in that, described simulation power supply is a direct current 12V power supply.
5, according to each described single fiber three-way module in the claim 1 to 4, it is characterized in that, described analog receiver circuit also comprises simulation receiving alarm circuit, and described warning circuit detects simulation received optical power signal, and at described optical power signals outputting alarm signal during less than set point.
6, single fiber three-way module according to claim 5, it is characterized in that, described simulation receiving alarm circuit comprises second comparator, an input of described second comparator connects described simulation received optical power signal, another input connects reference signal, and the output of described second comparator is exported corresponding alarm signal during less than reference signal at described simulation received optical power signal.
According to each described single fiber three-way module in the claim 1 to 4, it is characterized in that 7, described three-dimensional module comprises that the transmission of digital transmitter enables the port of control signal, described port is connected with described digital transmission machine circuit.
8, single fiber three-way module according to claim 5 is characterized in that, described three-dimensional module comprises that the transmission of digital transmitter enables the port of control signal, and described port is connected with described digital transmission machine circuit.
9, single fiber three-way module according to claim 7 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 digital received warning circuit, and described digital received warning circuit is the outputting alarm signal when the digital received abnormal signal.
10, single fiber three-way module according to claim 8 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 digital received warning circuit, and described digital received warning circuit is the outputting alarm signal when the digital received abnormal signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201750043U CN201315587Y (en) | 2008-11-03 | 2008-11-03 | Single-fiber three-dimensional module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201750043U CN201315587Y (en) | 2008-11-03 | 2008-11-03 | Single-fiber three-dimensional module |
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| CN201315587Y true CN201315587Y (en) | 2009-09-23 |
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| CNU2008201750043U Expired - Lifetime CN201315587Y (en) | 2008-11-03 | 2008-11-03 | Single-fiber three-dimensional module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475915A (en) * | 2013-09-16 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Multifunctional television in access to signals through optical fibers |
| CN112489410A (en) * | 2019-09-11 | 2021-03-12 | 李冰 | Transmitting and receiving device for photoelectric signals and operation method thereof |
-
2008
- 2008-11-03 CN CNU2008201750043U patent/CN201315587Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475915A (en) * | 2013-09-16 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Multifunctional television in access to signals through optical fibers |
| CN112489410A (en) * | 2019-09-11 | 2021-03-12 | 李冰 | Transmitting and receiving device for photoelectric signals and operation method thereof |
| CN112489410B (en) * | 2019-09-11 | 2022-09-02 | 李冰 | Transmitting and receiving device for photoelectric signals and operation method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090923 |