CN201667658U - Ultra-low light power receiving device - Google Patents
Ultra-low light power receiving device Download PDFInfo
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- CN201667658U CN201667658U CN2009202922624U CN200920292262U CN201667658U CN 201667658 U CN201667658 U CN 201667658U CN 2009202922624 U CN2009202922624 U CN 2009202922624U CN 200920292262 U CN200920292262 U CN 200920292262U CN 201667658 U CN201667658 U CN 201667658U
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Abstract
The utility model relates to a receiving device of an optical fiber transmission system, which comprises a photoelectric conversion unit, a low-noise amplification unit, an amplification output unit, a sampling unit, a microcomputer processing unit and a gain adjustment unit. The low-noise amplification unit and the amplification output unit carry out two-stage amplification on an electric signal; when the inlet light power of the ultra-low light power receiving device is -12dB, the system noise carrier ratio reaches 47dB; due to a light AGC control circuit which is additionally arranged and is composed of the sampling unit, the microcomputer processing unit and the gain adjustment unit, the receiving device can carry out automatic gain control, so as to lead output level to be kept stable all the time and follow the principle that the attenuation of the gain adjustment unit is increased by 2dB when the light power is increased by 1dB, thereby realizing perfect AGC control, stabilizing the changing of the output level within 1dB, and leading the system to have good fidelity performance.
Description
Technical field
The utility model relates to a kind of receiving system of fiber optic transmission system, relates in particular to a kind of ultralow luminous power receiving system.
Background technology
In recent years, along with the continuous progress of electronic technology and the fast development of fiber optic transmission system, provide a convenient, fast, information transmission accurately, the especially application of broadband network Transmission Fibers, for high-speed channel has been opened up in the information transmission.Generally, during Optical Fiber Transmission, transmitted power is big more, and transmission range is just far away more; Because consume on the way, fed distance is far away more, then the luminous power at the conveying circuit end is more little; Therefore for can be under certain transmitting optical power, the received optical power well on farther ground just needs the requirement of inlet luminous power of optical pickup apparatus lower.In a application number is 200620033633.3 Chinese utility model patent, a kind of ultralow luminous power receiving system is disclosed, it comprises that photoelectricity changes unit, low noise amplifying unit and amplifies output unit, photoelectric conversion unit and low noise amplifying unit adopt the direct-current coupling mode, and then amplify output through amplifying output unit.Adopt above-mentioned this ultralow luminous power receiving system, in the inlet luminous power of optical pickup apparatus during at-12dB, system's carrier-to-noise ratio promptly reaches 47dB, satisfy the requirement that televiews, than traditional inlet power requirement+1～-the low 6dB of 6dB, saved system's luminous power, reduced cost, extended transmission distance.But there is weak point in above-mentioned ultralow luminous power receiving system, because at the inlet of this receiving system, luminous power is not to keep stablizing constant, but certain excursion is arranged; When the inlet luminous power-12dB～+ when changing between 1dB, the output level that amplifies output unit also increases along with the increase of inlet luminous power; When optical power signals hour, convert the signal of telecommunication to after its level corresponding just low, when optical power signals is big, convert the signal of telecommunication to after its level corresponding just high, after amplifying through the low noise amplifying unit, the height difference of this level is more obvious; At this moment, if this signal of telecommunication is directly inputted to the amplification output unit,, low when high in the time of must causing the level of the output signal of telecommunication tangible through amplifying the further amplification output of output unit; The corresponding relation of inlet luminous power and output level is inlet optical power change 1dB, and output level changes 2dB in the same way; The too high linearity of its gain that makes of level descends, and making gains is difficult to accurately regulate and cause bigger distortion, and then makes the overall performance of this ultralow luminous power receiving system worsen.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of ultralow luminous power receiving system, and this ultralow luminous power receiving system can receive ultralow optical power signals, and in overall optical power range of receiving, stabilizing output level and fidelity are respond well simultaneously.The technical scheme that adopts is as follows:
A kind of ultralow luminous power receiving system comprises photoelectric conversion unit, low noise amplifying unit and amplifies output unit, the output of photoelectric conversion unit is electrically connected with the input of low noise amplifying unit, the output of low noise amplifying unit is electrically connected with the input of output amplifying unit, and it is characterized in that: described ultralow luminous power receiving system also comprises light AGC control circuit; Described smooth AGC control circuit comprises sampling unit, computer processing unit and gain adjusting unit; The input of described sampling unit is electrically connected with the output of photoelectric conversion unit, the output of sampling unit is electrically connected with the corresponding input of computer processing unit, the signal input part of gain adjusting unit and signal output part are electrically connected with the gain control end of low noise amplifying unit, and the control end of gain adjusting unit is electrically connected with the corresponding output of computer processing unit; Described computer processing unit comprises the A/D modular converter, and stores one group of control routine.
Operation principle: photoelectric conversion unit receives the optical power signals of input, convert it to the signal of telecommunication, the low noise amplifying unit receives the signal of telecommunication after the photoelectric conversion unit conversion, the signal of telecommunication is exported to the amplification output unit after low noise amplifying unit one-level is amplified through preliminary amplification, level adjustment and back level, and then amplifies the signal of telecommunication of back stabilizing output level through the amplification output unit; And the level adjustment of the signal of telecommunication is to control by the light AGC control circuit of being made up of sampling unit, computer processing unit and gain adjusting unit in the low noise amplifying unit, sampling unit carries out voltage sample to the signal of telecommunication of photoelectric conversion unit output, direct voltage is exported to computer processing unit, computer processing unit carries out the A/D conversion to this d. c. voltage signal, and according to control routine, export a control signal corresponding and give gain adjusting unit, gain adjusting unit is done the adjustment of corresponding amplitude to the level of the signal of telecommunication according to the control signal of input.
By photoelectric conversion unit the optical power signals of importing is converted to the signal of telecommunication, and adopt low noise amplifying unit and amplification output unit two-stage amplifying circuit that the signal of telecommunication is amplified, constitute ultralow luminous power receiving system, can be able to receive the purpose of fainter optical power signals.Yet, owing to allow to receive lower optical power signals, make that the input range of the optical power signals that allows in the inlet place of luminous power receiving system is bigger, reach-12dB～+ 1dB; Therefore, in circuit, increase and formed light AGC control circuit by sampling unit, computer processing unit and gain adjusting unit, to the adjustment that gains of the level of the signal of telecommunication, with the level equalization of the signal of telecommunication of low noise amplifying unit output at certain preset value, after the adjusted signal of telecommunication of over level is input to the amplification output unit, through amplifying the signal of telecommunication of output, it is stable that its level also keeps again.
Photoelectric conversion unit, sampling unit, low noise amplifying unit, gain adjusting unit and amplification output unit all are some circuit commonly used.Photoelectric conversion unit mainly comprises an optical-electrical converter, and it can be converted to the optical power signals of input the signal of telecommunication and output; Sampling unit is a kind of sample circuit commonly used, and it carries out voltage sample to the signal of telecommunication of input, the constant and output with direct current mode sustaining voltage value; The low noise amplifying unit amplifies the signal of telecommunication of input, and it can adjust the level of the signal of telecommunication by external control circuit, makes the level of the signal of telecommunication that amplifies output keep stable; Amplify output unit the signal of telecommunication is amplified back output.
Adjust accurately, control purpose easily for reaching, as preferred version of the present utility model, described one group of control routine is made of a plurality of control routines, in the input range of luminous power, the corresponding control routine of each optical power signals, each control routine comprise a level numerical value and a decay numerical value of representing the level height.The direct voltage that computer processing unit transports sampling unit carries out the A/D conversion, convert a level numerical value of representing the level height to, by the contrast of tabling look-up, find out the correspondence decay numerical value that this level numerical value need be made adjustment, and this decay numerical value is flowed to gain adjusting unit as control signal.Because under the situation of no gain control circuit, the corresponding relation of inlet luminous power and output level is inlet optical power change 1dB, output level changes 2dB in the same way, so above-mentioned when control routine is set, should follow luminous power and increase 1dB, the decay of gain adjusting unit increases the principle of 2dB, thereby reaches perfect AGC control, and the level vary stable that makes output is within 1dB.
In order to reach the purpose that makes things convenient for the original system upgrading and save repacking original system cost, as the further preferred version of the utility model, ultralow luminous power receiving system also comprises a standard module pedestal, and entire circuit all is installed on the standard module pedestal.All circuit all are installed on the standard module pedestal, the module of itself and original system is kept consistency, when original system is upgraded, directly replace the first order amplification module of original system, and other need not change, thereby has saved the repacking cost to original system.
The utility model is by the low noise amplifying unit and the amplification output unit of above-mentioned setting, the signal of telecommunication is carried out two-stage to be amplified, make ultralow luminous power receiving system inlet luminous power when-12dB, system's carrier-to-noise ratio promptly reaches 47dB, makes the inlet luminous power reduce 6dB than requiring usually, has reduced system cost, extend transmission distance, can transmit 10 kilometer as light signal more, can transmit 16 kilometers, save system's luminous power effect and obviously improve the 1550nm wavelength signals to the 1310nm wavelength; By increasing the light AGC control circuit that sampling unit, computer processing unit and gain adjusting unit are formed, the signal of telecommunication is carried out automatic gain control, the level equalization of the signal of telecommunication that makes low noise amplifying unit output is on preset value, amplify output through amplifying output unit again, it is stable to make output level remain; Simultaneously being provided with of control routine, following luminous power and increase 1dB, the gain adjusting unit decay increases the principle of 2dB, thereby can reach perfect AGC control, the level vary stable that makes output within 1dB, thereby make system have good fidelity performance.
Description of drawings
Fig. 1 is the frame principle figure of ultralow luminous power receiving system.
Fig. 2 is the circuit theory diagrams of ultralow luminous power receiving system.
Embodiment
Be described further below in conjunction with accompanying drawing and preferred implementation of the present utility model.
Shown in the frame principle figure of Fig. 1, ultralow luminous power receiving system of the present utility model comprises photoelectric conversion unit 1, low noise amplifying unit 2, amplifies output unit 3, sampling unit 4, computer processing unit 5 and gain adjusting unit 6; The output of photoelectric conversion unit 1 is electrically connected with the input of low noise amplifying unit 2, the output of low noise amplifying unit 2 is electrically connected with the input of output amplifying unit 3, the input of sampling unit 4 is electrically connected with the output of photoelectric conversion unit 1, the output of sampling unit 4 is electrically connected with the input of computer processing unit 5, the signal input part of gain adjusting unit 6 and signal output part are electrically connected with the gain control end of low noise amplifying unit 2, and the control end of gain adjusting unit 6 is electrically connected with computer processing unit 5 corresponding outputs.
Below in conjunction with the circuit theory diagrams of Fig. 2, the operation principle of ultralow luminous power receiving system of the present utility model is further described:
Ultralow luminous power receiving system of the present utility model is carrying out signal processing and is realizing on the circuit function, mainly comprises electric converting unit 1, low noise amplifying unit 2, amplifies output unit 3, sampling unit 4, computer processing unit 5 and gain adjusting unit 6; In side circuit is used, more perfect for making circuit, also comprise the smooth control circuit 7 of voltage, the bias current control circuit 8 of low noise amplifying unit 2, power samples output interface 9, the voltage stabilizing circuit 10 of computer processing unit 5.
Photoelectric conversion unit 1 mainly comprises optical-electrical converter D1; Low noise amplifying unit 2 mainly comprises low noise amplifier U1; Gain adjusting unit 6 mainly comprises D2/D3/D4 and U4/U7; Amplify output unit 3 and mainly comprise amplifier U3 and equalizing circuit; Sampling unit 4 is made up of sample circuit U8; Computer processing unit 5 comprises chip microprocessor U6, comprising the A/D modular converter, store one group of control routine among the chip microprocessor U6, each control routine comprises a level numerical value and a decay numerical value of representing the level height, the setting of control routine is followed luminous power and is increased 1dB, and gain adjusting unit 6 decay increase the principle of 2dB.
Photoelectric conversion unit 1 (D1), receive the optical power signals of input, and be converted to the signal of telecommunication, after low noise amplifying unit 2 (U1) tentatively amplifies the signal of telecommunication, flow to gain adjusting unit 6 (D2/D3/D4 and U4/U7) and carry out the level adjustment, through the adjusted signal of telecommunication of level re-enter carry out in the low noise amplifying unit 2 (U1) after level export to after amplifying and amplify output unit 3 (U3), again through amplifying the signal of telecommunication that output unit 3 (U3) amplifies the back stabilizing output level; It is to handle by the light AGC control circuit of being made up of sampling unit 4 (U8), computer processing unit 5 (U6) and gain adjusting unit 6 (D2/D3/D4 and U4/U7) that the signal of telecommunication in the low noise amplifying unit 2 (U1) is carried out the level adjustment; Sampling unit 4 (U8) carries out voltage sample to the signal of telecommunication by photoelectric conversion unit 1 (D1) output, keep this direct voltage in the direct current mode, and export to computer processing unit 5 (U6), computer processing unit 5 (U6) carries out the A/D conversion to this direct voltage, convert a level numerical value of representing the level height to, by the contrast of tabling look-up, find out the correspondence decay numerical value that this level numerical value need be made adjustment, and this decay numerical value is flowed to gain adjusting unit 6 (D2/D3/D4 and U4/U7) as control signal; Gain adjusting unit 6 (D2/D3/D4 and U4/U7) is done the adjustment of corresponding amplitude to the level of the signal of telecommunication according to the control signal of input; When the luminous power of input hour, less decay numerical value of computer processing unit 5 (U6) output, gain adjusting unit 6 (D2/D3/D4 and U4/U7) is carried out more by a small margin decay to the signal of telecommunication; When the luminous power of input is big, bigger decay numerical value of computer processing unit 5 (U6) output, gain adjusting unit 6 (D2/D3/D4 and U4/U7) is carried out by a relatively large margin decay to the signal of telecommunication.For example, when the inlet luminous power be-during 11dBm, increased 1dB than default inlet luminous power-12dB, in computer processing unit 5 (U6) inside, the voltage that is provided according to sampling unit 4, be converted to voltage value by A/D, and search the control corresponding code, at this moment, decay numerical value is 2, with the input control signal of this decay numerical value 2 as gain adjusting unit 6 (D2/D3/D4 and U4/U7), gain adjusting unit 6 (D2/D3/D4 and U4/U7) is carried out the decay of 2dB to the signal of telecommunication, thereby makes the level of the signal of telecommunication after decaying keep stablizing constant.
In other embodiments, above-mentioned entire circuit all can be installed on the standard module pedestal, when original system is upgraded, can directly replace the first order amplification module of original system, and other need not change.
Claims (1)
1. a ultralow luminous power receiving system comprises photoelectric conversion unit, low noise amplifying unit and amplifies output unit, the output of photoelectric conversion unit is electrically connected with the input of low noise amplifying unit, the output of low noise amplifying unit is electrically connected with the input of output amplifying unit, and it is characterized in that: described ultralow luminous power receiving system also comprises light AGC control circuit; Described smooth AGC control circuit comprises sampling unit, computer processing unit and gain adjusting unit; The input of described sampling unit is electrically connected with the output of photoelectric conversion unit, the output of sampling unit is electrically connected with the corresponding input of computer processing unit, the signal input part of gain adjusting unit and signal output part are electrically connected with the gain control end of low noise amplifying unit, and the control end of gain adjusting unit is electrically connected with the corresponding output of computer processing unit; Described computer processing unit comprises the A/D modular converter, and stores one group of control routine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922624U CN201667658U (en) | 2009-12-15 | 2009-12-15 | Ultra-low light power receiving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922624U CN201667658U (en) | 2009-12-15 | 2009-12-15 | Ultra-low light power receiving device |
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| CN201667658U true CN201667658U (en) | 2010-12-08 |
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| CN2009202922624U Expired - Lifetime CN201667658U (en) | 2009-12-15 | 2009-12-15 | Ultra-low light power receiving device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066937A (en) * | 2012-12-07 | 2013-04-24 | 江苏汇成光电有限公司 | Blade detecting device of cutting machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
-
2009
- 2009-12-15 CN CN2009202922624U patent/CN201667658U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066937A (en) * | 2012-12-07 | 2013-04-24 | 江苏汇成光电有限公司 | Blade detecting device of cutting machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
| CN104506244B (en) * | 2014-12-25 | 2018-04-03 | 四川璧虹广播电视新技术有限公司 | A kind of AGC control circuits of management type family expenses photoreceiver |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG DONYAN NETWORK TECHNOLOGIES CO., LTD. Free format text: FORMER NAME: SHANTOU HI-TECH ZONE ULTRA-VISTA TECHNOLOGIES INC. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Shantou high tech Zone Technology South Street Longhu District 515000 in Guangdong Province, Shantou City No. 6 Building 5 floor hengze Patentee after: GUANGDONG DONGYAN NETWORK TECHNOLOGIES Co.,Ltd. Address before: Shantou high tech Zone Technology South Street Longhu District 515000 in Guangdong Province, Shantou City No. 6 Building 5 floor hengze Patentee before: Shantou Hi-tech Zone Ultra-vista Technologies Inc. |
|
| CP03 | Change of name, title or address |
Address after: 515000, Shantou hi tech Zone, Guangdong Province Road 6 (venture building) third, eleventh, twelfth layers Patentee after: GUANGDONG DONYAN NETWORK TECHNOLOGIES Co.,Ltd. Address before: Shantou high tech Zone Technology South Street Longhu District 515000 in Guangdong Province, Shantou City No. 6 Building 5 floor hengze Patentee before: GUANGDONG DONGYAN NETWORK TECHNOLOGIES Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20101208 |
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| CX01 | Expiry of patent term |