CN203225762U - Small-gain deviation dual-stage bandwidth control optical receiver - Google Patents
Small-gain deviation dual-stage bandwidth control optical receiver Download PDFInfo
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- CN203225762U CN203225762U CN 201320205696 CN201320205696U CN203225762U CN 203225762 U CN203225762 U CN 203225762U CN 201320205696 CN201320205696 CN 201320205696 CN 201320205696 U CN201320205696 U CN 201320205696U CN 203225762 U CN203225762 U CN 203225762U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 29
- 239000003990 capacitor Substances 0.000 abstract description 17
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 238000001914 filtration Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J1/46—Electric circuits using a capacitor
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Abstract
The utility model discloses a small-gain deviation dual-stage bandwidth control optical receiver. The small-gain deviation dual-stage bandwidth control optical receiver includes a photodiode, two stages of high-pass filters and two stages of amplification circuits; a high-pass filtering circuit of each stage is a series-connection high-pass filtering circuit composed of two capacitors, two resistors and two switches; a signal output end of the photodiode is connected with signal input ends of a first-stage high-pass filter, a first-stage amplification circuit, a second-stage high-pass filter and a second-stage amplification circuit sequentially; and a signal output end of the second-stage amplification circuit is a signal output end of the optical receiver. According to the small-gain deviation dual-stage bandwidth control optical receiver of the utility model, the switches are additionally arranged in the high-frequency filters, such that capacitance values and resistance values can be controlled, and therefore, the bandwidth of output signals can be changed, and bandwidth adjustability can be realized, and adjustment of received signals can be facilitated, and the degree of signal distortion can be reduced to be approximately minimum; and at the same time, through adopting the two stages of filterers and the two stages of amplification circuits, more accurate bandwidth adjustment can be realized, and small gain deviation can be realized.
Description
Technical field
The utility model relates to a kind of optical receiver, relates in particular to the optical receiver of the adjustable little gain deviation twin-stage control bandwidth of a kind of output signal bandwidth.
Background technology
Optical receiver is the equipment of receiving optical signals, generally includes photodetector, filter and amplifier.In optical fiber telecommunications system, the task of optical receiver is with the additional noise of minimum and distortion, recover after the Optical Fiber Transmission by the entrained information of light carrier, so the output characteristic concentrated expression of optical receiver the performance of whole optical fiber telecommunications system.
The light signal of optical sender emission is after transmission, and amplitude fading, and impulse waveform not only is broadening also, and the effect of optical receiver is exactly the faint optical signal that detects through transmission, and amplification, shaping, the former transmission signal of regeneration.
In the optical receiver, the main effect of photodetector is to utilize photoelectric effect that light signal is changed into the signal of telecommunication.In optical communication system, to the requirement of photodetector be highly sensitive, response is fast, noise is little, cost is low and reliability is high.The basic principle of Photoelectric Detection process is light absorption.At present, photodetector commonly used is photodiode, avalanche photodide in optical communication system.Because the signal that receives of optical receiver is very faint, in addition under the disturbed condition of high background noise field, can cause receiving terminal signal to noise ratio S/N＜1 again, so be very necessary to Signal Processing.Usually take filter and amplifier that the signal of telecommunication of photodetector output is handled.
The filter of existing optical receiver, generally take the permanent circuit structure to realize filtering, that is to say that its frequency filtering fixes, so the signal bandwidth of final output is fixed, be unfavorable for like this regulating to received signal, be difficult to accomplish with signal distortion drop to level off to minimum.
The utility model content
The purpose of this utility model just is to provide in order to address the above problem the optical receiver of the adjustable little gain deviation twin-stage control bandwidth of a kind of output signal bandwidth.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The optical receiver of little gain deviation twin-stage control bandwidth described in the utility model comprises photodiode, high pass filter and amplifying circuit, described high pass filter comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance, second resistance, the 5th resistance, the 6th resistance, first switch, second switch, the 3rd switch and the 4th switch, described amplifying circuit comprises first amplifier, second amplifier, the 3rd resistance, the 4th resistance, the 7th resistance and the 8th resistance, the negative pole of described photodiode, first end of described first electric capacity and first end of described second electric capacity interconnect, second end of described first electric capacity, second end with described second electric capacity of connecting behind described first switch simultaneously, first end of described first resistance is connected with first end of described second resistance, second end of described second resistance is connected and is connected with second end of described first resistance and the positive signal input of described first amplifier simultaneously behind the described second switch, the negative signal input of described first amplifier, first end of described the 3rd resistance and first end of described the 4th resistance interconnect, second end of described the 3rd resistance, the output of described first amplifier, first end of described the 3rd electric capacity and first end of described the 4th electric capacity interconnect, second end of described the 3rd electric capacity, second end with described the 4th electric capacity of connecting behind described the 3rd switch simultaneously, first end of described the 5th resistance is connected with first end of described the 6th resistance, second end of described the 6th resistance is connected and is connected with second end of described the 5th resistance and the positive signal input of described second amplifier simultaneously behind described the 4th switch, the negative signal input of described second amplifier, first end of described the 7th resistance and first end of described the 8th resistance interconnect, second end of described the 7th resistance is connected with the output of described second amplifier, second end of described the 8th resistance, second end of described the 4th resistance and the positive pole of described photodiode interconnect, and second end of the output of described second amplifier and described the 8th resistance is the output of described optical receiver.
The beneficial effects of the utility model are:
The utility model is by increasing the size of switch control capacitance value, resistance value in high frequency filter, thereby changes the frequency bandwidth of output signal, realizes that bandwidth is adjustable, is conducive to regulate to received signal, signal distortion is dropped to as far as possible level off to minimum; Simultaneously, by adopting two-stage filtering and amplifying circuit, realize bandwidth adjustment more accurately, realize the purpose of little gain deviation simultaneously.
Description of drawings
Fig. 1 is the circuit diagram of the optical receiver of little gain deviation twin-stage control bandwidth described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, the optical receiver of little gain deviation twin-stage control bandwidth described in the utility model comprises photodiode VD, high pass filter and amplifying circuit, high pass filter comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, first resistance R 1, second resistance R 2, the 5th resistance R 5, the 6th resistance R 6, first K switch 1, second switch K2, the 3rd K switch 3 and the 4th K switch 4, amplifying circuit comprises the first amplifier IC1, the second amplifier IC2, the 3rd resistance R 3, the 4th resistance R 4, the 7th resistance R 7 and the 8th resistance R 8, the negative pole of photodiode VD, first end of first end of first capacitor C 1 and second capacitor C 2 interconnects, second end of first capacitor C 1 connect first K switch 1 back simultaneously with second end of second capacitor C 2, first end of first resistance R 1 is connected with first end of second resistance R 2, be connected with second end of first resistance R 1 and the positive signal input of the first amplifier IC1 simultaneously behind second end series connection second switch K2 of second resistance R 2, the negative signal input of the first amplifier IC1, first end of first end of the 3rd resistance R 3 and the 4th resistance R 4 interconnects, second end of the 3rd resistance R 3, the output of the first amplifier IC1, first end of first end of the 3rd capacitor C 3 and the 4th capacitor C 4 interconnects, second end of the 3rd capacitor C 3 connect the 3rd K switch 3 back simultaneously with second end of the 4th capacitor C 4, first end of the 5th resistance R 5 is connected with first end of the 6th resistance R 6, second end of the 6th resistance R 6 is connected 4 back connections with second end of the 5th resistance R 5 and the positive signal input of the second amplifier IC2 simultaneously of the 4th K switch, the negative signal input of the second amplifier IC2, first end of first end of the 7th resistance R 7 and the 8th resistance R 8 interconnects, second end of the 7th resistance R 7 is connected with the output of the second amplifier IC2, second end of the 8th resistance R 8, second end of the 4th resistance R 4 and the positive pole of photodiode VD interconnect, and second end of the output of the second amplifier IC2 and the 8th resistance R 8 is the output U of described optical receiver
O
As shown in Figure 1, first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2, first K switch 1 and second switch K2 form first order high pass filter jointly, the first amplifier IC1, the 3rd resistance R 3 and the 4th resistance R 4 common first order amplifying circuits of forming, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th resistance R 5, the 6th resistance R 6, the 3rd K switch 3 and the 4th K switch 4 common second level high pass filters of forming, the second amplifier IC2, the 7th resistance R 7 and the 8th resistance R 8 common second level amplifying circuits of forming.By changing the on off state of first K switch 1, second switch K2, the 3rd K switch 3 and the 4th K switch 4, can change the size of capacitance and resistance value in first order high pass filter and the second level high pass filter, thereby change the cut-off frequency of filter, the bandwidth of amplifying the signal of output through amplifying circuit is also changed, therefore the output signal frequency bandwidth of optical receiver can be adjusted to the best, reduce signal distortion as far as possible.
Claims (1)
1. the optical receiver of one kind little gain deviation twin-stage control bandwidth, comprise photodiode, high pass filter and amplifying circuit, it is characterized in that: described high pass filter comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance, second resistance, the 5th resistance, the 6th resistance, first switch, second switch, the 3rd switch and the 4th switch, described amplifying circuit comprises first amplifier, second amplifier, the 3rd resistance, the 4th resistance, the 7th resistance and the 8th resistance, the negative pole of described photodiode, first end of described first electric capacity and first end of described second electric capacity interconnect, second end of described first electric capacity, second end with described second electric capacity of connecting behind described first switch simultaneously, first end of described first resistance is connected with first end of described second resistance, second end of described second resistance is connected and is connected with second end of described first resistance and the positive signal input of described first amplifier simultaneously behind the described second switch, the negative signal input of described first amplifier, first end of described the 3rd resistance and first end of described the 4th resistance interconnect, second end of described the 3rd resistance, the output of described first amplifier, first end of described the 3rd electric capacity and first end of described the 4th electric capacity interconnect, second end of described the 3rd electric capacity, second end with described the 4th electric capacity of connecting behind described the 3rd switch simultaneously, first end of described the 5th resistance is connected with first end of described the 6th resistance, second end of described the 6th resistance is connected and is connected with second end of described the 5th resistance and the positive signal input of described second amplifier simultaneously behind described the 4th switch, the negative signal input of described second amplifier, first end of described the 7th resistance and first end of described the 8th resistance interconnect, second end of described the 7th resistance is connected with the output of described second amplifier, second end of described the 8th resistance, second end of described the 4th resistance and the positive pole of described photodiode interconnect, and second end of the output of described second amplifier and described the 8th resistance is the output of described optical receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320205696 CN203225762U (en) | 2013-04-23 | 2013-04-23 | Small-gain deviation dual-stage bandwidth control optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320205696 CN203225762U (en) | 2013-04-23 | 2013-04-23 | Small-gain deviation dual-stage bandwidth control optical receiver |
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| Publication Number | Publication Date |
|---|---|
| CN203225762U true CN203225762U (en) | 2013-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320205696 Expired - Fee Related CN203225762U (en) | 2013-04-23 | 2013-04-23 | Small-gain deviation dual-stage bandwidth control optical receiver |
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| Country | Link |
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| CN (1) | CN203225762U (en) |
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2013
- 2013-04-23 CN CN 201320205696 patent/CN203225762U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20140423 |