CN201571063U - Optical transmitter - Google Patents
Optical transmitter Download PDFInfo
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- CN201571063U CN201571063U CN2009202922643U CN200920292264U CN201571063U CN 201571063 U CN201571063 U CN 201571063U CN 2009202922643 U CN2009202922643 U CN 2009202922643U CN 200920292264 U CN200920292264 U CN 200920292264U CN 201571063 U CN201571063 U CN 201571063U
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Abstract
The utility model relates to an optical transmitter, which comprises a radio frequency input circuit, a predistortion correction circuit and a laser. The optical transmitter is characterized in that: the predistortion correction circuit consists of a shunt unit, a delay unit, a non-linear distortion signal generation unit, an amplitude regulation unit, a first phasing unit, an amplitude-scaling unit, an amplitude equalization unit, a second phasing unit and a signal synthesization unit; the main route signal output end of the shunt unit is connected with the main route signal input end of the signal synthesization unit via the delay unit; and the shunt signal output end of the shunt unit is connected with the shunt signal input end of the signal synthesization unit sequentially via the non-linear distortion signal generation unit, the amplitude regulation unit, the first phasing unit, the amplitude-scaling unit, the amplitude equalization unit and the second phasing unit. The non-linear compensation range of the predistortion correction circuit is wide; the correction of the predistortion correction circuit can counteract the non-linear distortion of the laser, and thereby the non-linear index of the optical transmitter is remarkably increased.
Description
Technical field
The utility model relates to the emitter of fiber optic transmission system, specifically, relates to a kind of optical sender with predistortion correction circuit.
Background technology
Along with the continuous progress of electronic technology and the fast development of fiber optic transmission system, for all trades and professions, government department etc. provide convenient, fast and accurate information transmission; Especially the application of broadband network Transmission Fibers for high-speed channel has been opened up in the information transmission, to socioeconomic comprehensive prosperity and development, improves the people's work studying and living, has played enormous function.
Optical sender is the capital equipment in the fiber optic transmission system, and optical sender generally includes radio frequency input circuit, predistortion correction circuit and laser, and radio frequency input circuit, predistortion correction circuit and laser are electrically connected successively; Wherein the radio frequency input circuit receives the radiofrequency signal be input to optical sender, amplify with automatic gain control after, form and satisfy the radiofrequency signal of the required level of drive laser, and be transferred to the predistortion correction circuit; The predistortion correction circuit carries out predistortion correction to the radiofrequency signal that receives to be handled, and with the nonlinear distortion of counteracting laser, and will give laser through the radio signal transmission that predistortion correction is handled; Laser is by the radio frequency signals drive from the predistortion correction circuit, and produces corresponding light signal.In addition, optical sender also can comprise microprocessor, laser control circuit and network management interface; Microprocessor is connected with laser by laser control circuit, and laser control circuit can be controlled temperature, power and the bias current etc. of laser, makes the Output optical power of laser keep stable; Network management interface is connected with microprocessor, thereby can carry out the far-end webmaster to optical sender by Ethernet.
Laser is the main devices of optical sender, and the predistortion correction circuit can improve the non-linear index of optical sender, reduces the requirement to laser, thereby reduces the cost of optical sender.
The major defect of the predistortion correction circuit of existing optical sender is the non-linear index not enough (can only compensate 2-4dB now) that can compensate, and is still higher to the requirement of laser, so the cost of optical sender is higher.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of optical sender with predistortion correction circuit, and this optical sender has the higher non-linearity index.The technical scheme that adopts is as follows:
A kind of optical sender, comprise radio frequency input circuit, predistortion correction circuit and laser, radio frequency input circuit, predistortion correction circuit and laser are electrically connected successively, it is characterized in that: described predistortion correction circuit is made up of branching unit, delay cell, nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit, second phasing unit and signal synthesis unit; The delayed unit of the main path signal output of branching unit connects the main path signal input of signal synthesis unit; The shunting sign output of branching unit is connected the shunting sign input of signal synthesis unit successively through nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit and second phasing unit.
Above-mentioned branching unit can adopt splitter, and the signal of importing is divided into main path signal and shunting sign; Shunting sign enters predistortion passage (being made up of nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit and second phasing unit), obtains pre-distorted signals through handling; Delay cell can adopt delay line, and delay cell is carried out certain time-delay to main path signal, makes that main path signal and pre-distorted signals are synchronous; At last, the main path signal of process time-delay and pre-distorted signals mix in signal synthesis unit and export (signal output part that the signal output part of signal synthesis unit promptly is the predistortion correction circuit), and signal synthesis unit can adopt splitter.
Preferred above-mentioned nonlinear distortion signal generation unit comprises diode assembly and synthesizer; Diode assembly is formed by two Schottky diode encapsulation, comprise a public input and two outputs, the anode of one of them Schottky diode connects public input, negative electrode connects an output, and the negative electrode of another Schottky diode connects public input, anode connects another output; Two outputs of diode assembly connect two inputs of synthesizer respectively, and the output of synthesizer connects the input of amplitude adjustment unit.Synthesizer can adopt high frequency transformer.Shunting sign is through producing two-way nonlinear distortion signal behind the diode assembly, two-way nonlinear distortion signal is through synthetic one tunnel nonlinear distortion signal of synthesizer.
Above-mentioned amplitude adjustment unit can adopt attenuator, is used to adjust the amplitude of nonlinear distortion signal.
Above-mentioned first phasing unit mainly is made up of variable capacitance diode (D18), and the plus earth of this variable capacitance diode (D18), negative electrode connect the output of amplitude adjustment unit.First phasing unit is used to adjust the phase place of nonlinear distortion signal.
Above-mentioned amplitude amplifying unit can adopt amplifier, is used for the nonlinear distortion signal is amplified.
Above-mentioned amplitude equalization unit mainly is made up of variable capacitance diode (D14), is used for the nonlinear distortion signal is carried out amplitude equalization.
Above-mentioned second phasing unit mainly is made up of variable capacitance diode (D19), and the plus earth of this variable capacitance diode (D19), negative electrode connect the output of amplitude equalization unit.Second phasing unit is used for adjusting once more the phase place of nonlinear distortion signal.
Above-mentioned radio frequency input circuit can adopt existing radio frequency input circuit with amplification, automatic gain control function.
Above-mentioned laser can adopt existing laser (as the GaAs module).
In addition, above-mentioned optical sender also can comprise microprocessor, laser control circuit and network management interface; Microprocessor is connected with laser by laser control circuit, and laser control circuit can be controlled temperature, power and the bias current etc. of laser, makes the Output optical power of laser keep stable; Network management interface is connected with microprocessor, thereby can carry out the far-end webmaster to optical sender by Ethernet.
The utility model utilizes the predistortion passage of being made up of nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit and second phasing unit in the predistortion correction circuit, produce a signal suitable with laser nonlinear distortion amplitude, that phase place is opposite, after mixing, main path signal enters laser at signal synthesis unit, can offset the nonlinear distortion of laser, significantly improve the non-linear index of optical sender.The nonlinear compensation scope of predistortion correction circuit big (can compensate 10-15dB); Through the correction of predistortion correction circuit, the non-linear index of the link of optical sender can improve 10-15dB, makes the non-linear index of link of optical sender reach CTB:70dB, CSO:68dB, C/N:52dB.The utility model can adopt various lasers, and is lower to the requirement of laser, therefore can adopt the lower laser of price, reduces the cost of optical sender.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model preferred embodiment;
Fig. 2 is the schematic block circuit diagram of predistortion correction circuit in the utility model preferred embodiment;
Fig. 3 is the circuit theory diagrams of predistortion correction circuit in the utility model preferred embodiment.
Embodiment
As shown in Figure 1, this optical sender comprises radio frequency input circuit 1, predistortion correction circuit 2 and laser 3, and radio frequency input circuit 1, predistortion correction circuit 2 and laser 3 are electrically connected successively.
As shown in Figure 2, the predistortion correction circuit is made up of branching unit 21, delay cell 22, nonlinear distortion signal generation unit 23, amplitude adjustment unit 24, first phasing unit 25, amplitude amplifying unit 26, amplitude equalization unit 27, second phasing unit 28 and signal synthesis unit 29; The delayed unit 22 of the main path signal output of branching unit 21 connects the main path signal input of signal synthesis unit 29; The shunting sign output of branching unit 21 is connected the shunting sign input of signal synthesis unit 29 successively with second phasing unit 28 through nonlinear distortion signal generation unit 23, amplitude adjustment unit 24, first phasing unit 25, amplitude amplifying unit 26, amplitude equalization unit 27, nonlinear distortion signal generation unit 23, amplitude adjustment unit 24, first phasing unit 25, amplitude amplifying unit 26, amplitude equalization unit 27 and second phasing unit 28 are formed the predistortion passage.
As shown in Figure 3, branching unit 21 adopts splitter T9, and the pin 3 of splitter T9 is that signal input part, pin 4 are the shunting sign output for main path signal output, pin 1.The radiofrequency signal output of radio frequency input circuit 1 connects the signal input part (being the pin 3 of splitter T9) of branching unit 21.
Signal synthesis unit 29 adopts splitter T10, and the pin 6 of splitter T10 is that main path signal input, pin 3 are signal output part for shunting sign input, pin 1.The signal output part of signal synthesis unit 29 (being the pin 1 of splitter T10) connects the radio-frequency (RF) signal input end of laser 3.
The pin 4 delayed line L1 of splitter T9 connect the pin 6 of splitter T10.
Nonlinear distortion signal generation unit 23 mainly is made up of diode assembly D17 and synthesizer T11; Diode assembly D17 is formed by two Schottky diode encapsulation, comprises a public input and two outputs, and this public input connects the pin 1 of splitter T9; The anode of one of them Schottky diode connects public input, negative electrode connects an output, and this output connects the pin 1 of synthesizer T11; The negative electrode of another Schottky diode connects public input, anode connects another output, and this output connects the pin 6 of synthesizer T11; Synthesizer T11 adopts high frequency transformer, and the output of synthesizer T11 (being pin 3) connects the input (being the common cathode of diode assembly D15) of amplitude adjustment unit 24.
First phasing unit 25 mainly is made up of variable capacitance diode D18, and the plus earth of variable capacitance diode D18, negative electrode connect the output (being the common cathode of diode assembly D16) of amplitude adjustment unit 24.
Amplitude amplifying unit 26 adopts amplifier U22, and the input of amplifier U22 connects the negative electrode of variable capacitance diode D18, and the output of amplifier U22 connects the input of amplitude equalization unit 27.
Above-mentioned radio frequency input circuit 1 can adopt existing radio frequency input circuit with amplification, automatic gain control function; Above-mentioned laser 3 can adopt existing laser; Above-mentioned optical sender also can comprise microprocessor, laser control circuit and network management interface, and microprocessor is connected with laser by laser control circuit, and network management interface is connected with microprocessor.Radio frequency input circuit, laser, microprocessor, laser control circuit and network management interface all can adopt prior art, are not described in detail at this.
Brief description is the operation principle of this optical sender once:
Radio frequency input circuit 1 receives the radiofrequency signal that is input to optical sender, amplify with automatic gain control after, the radiofrequency signal of drive laser 3 required level is satisfied in formation, and is transferred to predistortion correction circuit 2 (radiofrequency signal of radio frequency input circuit 1 output enters predistortion correction circuit 2 from the signal input part (being the pin 3 of splitter T9) of branching unit 21);
Radiofrequency signal enters branching unit 21 from the signal input part (being the pin 3 of splitter T9) of branching unit 21, by branching unit 21 radiofrequency signal of importing is divided into main path signal and shunting sign.
After the delayed unit 22 of main path signal carries out certain time-delay, from the main path signal input entering signal synthesis unit 29 of signal synthesis unit 29.
Shunting sign produces nonlinear distortion signal (through producing two-way nonlinear distortion signal behind the diode assembly D17, two-way nonlinear distortion signal is through synthetic one tunnel nonlinear distortion signal of synthesizer T11) through nonlinear distortion signal generation unit 23 backs; Adjust the amplitude (transferring VC1) of nonlinear distortion signal then through amplitude adjustment unit 24; Adjust the phase place (transferring VC2) of nonlinear distortion signal then through first phasing unit 25; Amplify through 26 pairs of nonlinear distortion signals of amplitude amplifying unit then; Carry out amplitude equalization (transferring VC3) through the 27 pairs of nonlinear distortion signals in amplitude equalization unit then; Adjust the phase place (transfer VTC) of nonlinear distortion signal more once more through second phasing unit 28, and from the shunting sign input entering signal synthesis unit 29 of signal synthesis unit 29.
Main path signal and nonlinear distortion signal through time-delay mix in signal synthesis unit 29, and export laser 3 to from the signal output part of signal synthesis unit 29.
Laser control circuit can be controlled temperature, power and the bias current etc. of laser, makes the Output optical power of laser keep stable; Can carry out the far-end webmaster to optical sender by Ethernet through network management interface.
In addition, above-mentioned branching unit 21, delay cell 22, nonlinear distortion signal generation unit 23, amplitude adjustment unit 24, first phasing unit 25, amplitude amplifying unit 26, amplitude equalization unit 27, second phasing unit 28 and signal synthesis unit 29 also can adopt existing other circuit or device.
Claims (2)
1. optical sender, comprise radio frequency input circuit, predistortion correction circuit and laser, radio frequency input circuit, predistortion correction circuit and laser are electrically connected successively, it is characterized in that: described predistortion correction circuit is made up of branching unit, delay cell, nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit, second phasing unit and signal synthesis unit; The delayed unit of the main path signal output of branching unit connects the main path signal input of signal synthesis unit; The shunting sign output of branching unit is connected the shunting sign input of signal synthesis unit successively through nonlinear distortion signal generation unit, amplitude adjustment unit, first phasing unit, amplitude amplifying unit, amplitude equalization unit and second phasing unit.
2. optical sender according to claim 1 is characterized in that: described nonlinear distortion signal generation unit comprises diode assembly and synthesizer; Diode assembly is formed by two Schottky diode encapsulation, comprise a public input and two outputs, the anode of one of them Schottky diode connects public input, negative electrode connects an output, and the negative electrode of another Schottky diode connects public input, anode connects another output; Two outputs of diode assembly connect two inputs of synthesizer respectively, and the output of synthesizer connects the input of amplitude adjustment unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922643U CN201571063U (en) | 2009-12-15 | 2009-12-15 | Optical transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202922643U CN201571063U (en) | 2009-12-15 | 2009-12-15 | Optical transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201571063U true CN201571063U (en) | 2010-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202922643U Expired - Lifetime CN201571063U (en) | 2009-12-15 | 2009-12-15 | Optical transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201571063U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393923A (en) * | 2014-10-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Radio frequency optical transmission system linearization processing method based on a digital post-processing technology |
| CN107968683A (en) * | 2017-12-05 | 2018-04-27 | 无锡路通视信网络股份有限公司 | A kind of control circuit and control method of laser optical transmission power |
-
2009
- 2009-12-15 CN CN2009202922643U patent/CN201571063U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393923A (en) * | 2014-10-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Radio frequency optical transmission system linearization processing method based on a digital post-processing technology |
| CN104393923B (en) * | 2014-10-09 | 2017-04-12 | 中国电子科技集团公司第五十四研究所 | Radio frequency optical transmission system linearization processing method based on a digital post-processing technology |
| CN107968683A (en) * | 2017-12-05 | 2018-04-27 | 无锡路通视信网络股份有限公司 | A kind of control circuit and control method of laser optical transmission power |
| CN107968683B (en) * | 2017-12-05 | 2023-07-28 | 无锡路通视信网络股份有限公司 | Control circuit and control method for light emission power of laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100901 |