CN203135890U - Light receiver - Google Patents
Light receiver Download PDFInfo
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- CN203135890U CN203135890U CN 201320019873 CN201320019873U CN203135890U CN 203135890 U CN203135890 U CN 203135890U CN 201320019873 CN201320019873 CN 201320019873 CN 201320019873 U CN201320019873 U CN 201320019873U CN 203135890 U CN203135890 U CN 203135890U
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- control unit
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- impedance amplifier
- temperature
- voltage control
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Abstract
The utility model discloses a light receiver comprising a photodiode, a photodiode voltage control unit, a trans-impedance amplifier, a trans-impedance amplifier voltage control unit, a signal amplifier, a central control unit, a temporary storage, analog-to-digital converter and a temperature sensor. The light receiver can return temperature value signals to the trans-impedance amplifier voltage control unit according to present work temperature so as to determine a working point of the trans-impedance amplifier, so gain of the trans-impedance amplifier can properly change along the temperature, thereby obtaining a purpose that light receiver sensitivity is improved in a whole work temperature range. The utility model also provides a dynamic gain control method of the light receiver; work temperature signals of the light receiver are returned to the trans-impedance amplifier voltage control unit so as to dynamically adjust gain of the trans-impedance amplifier, thereby improving reception sensitivity or saturation performance of the light receiver.
Description
Technical field
The utility model relates to optical communication field, relates in particular to a kind of optical receiver.
Background technology
Optical receiver is surveyed light signal, and converts thereof into the signal of telecommunication, amplifies then, as the input of other equipment or communication system.Photo-detector in most of optical fiber telecommunications systems produces and imports the electric current that light is directly proportional, and this current signal is through trans-impedance amplifier TIA(Trans-impedance amplifier) be exaggerated into voltage signal.Usually need two-stage, i.e. preposition amplification and amplification, each grade all is optimized different signal levels.In the practical application in industry, receiver encapsulates by module independently, also often and transmitter be integrated in the same module, constitute light transmit-receive integrated machine.
The reception of optical receiver saturated with receiving sensitivity be two leading indicators.Receiver sensitivity refers to be operated in the minimum light input power that the performance level place of requirement needs.Because the reception dynamic range of receiver circuit is limited, adjust according to different application requirements between saturated so need and receive in receiving sensitivity.Since photodetector especially the gain of avalanche photodide be acted upon by temperature changes bigger, so need to control or temperature-compensating bias voltage.On the other hand, for certain luminous power input, perhaps under the situation as linear TIA use, the gain of the trans-impedance amplifier in the optical receiver (TIA) is definite value, can not change in use.Under hot conditions, may cause receiver sensitivity bad like this.
Summary of the invention
The utility model has proposed a kind of optical receiver in order to overcome above deficiency, and it can change the gain of trans-impedance amplifier (TIA) according to variation of temperature.
Technical problem of the present utility model is solved by following technical scheme:
A kind of optical receiver, comprise photodiode, the photodiode voltage control unit, trans-impedance amplifier, the trans-impedance amplifier voltage control unit, signal amplifier, central control unit, register, analog to digital converter and temperature sensor, the photodiode voltage control unit provides operating voltage for photodiode, photodiode receiving optical signals and output current signal, this current signal is converted into voltage signal through trans-impedance amplifier, amplify through the signal amplifier shaping then, temperature sensor detecting temperature value is also passed to analog to digital converter with the temperature value analog quantity, analog to digital converter output temperature digital quantity is to register, central control unit reads the temperature digital amount in the register, and inquire about pre-set trans-impedance amplifier voltage correspondence table, and feed back to the photodiode voltage control unit, central control unit also removes to control the trans-impedance amplifier voltage control unit according to temperature digital amount output voltage control signal in the register, makes the gain of trans-impedance amplifier to change with temperature in good time.
In an embodiment of the present utility model, also comprise the D/A expanding element, described D/A expanding element is connected between central control unit and the trans-impedance amplifier voltage control unit, and central control unit is exported corresponding voltage value signal by the D/A expanding element and given the trans-impedance amplifier voltage control unit.
In an embodiment of the present utility model, described photodiode is avalanche photodide.
In an embodiment of the present utility model, described central control unit, register, analog to digital converter and temperature sensor are integrated in the single-chip microcomputer.
In an embodiment of the present utility model, described central control unit, register, analog to digital converter, temperature sensor and D/A expanding element are integrated in the single-chip microcomputer.
Optical receiver of the present utility model, working temperature according to current optical receiver, temperature value signal is fed back to the trans-impedance amplifier voltage control unit, decide the working point of trans-impedance amplifier with this, the gain of trans-impedance amplifier can change with temperature in good time like this, thereby reaches the purpose of improving optical receiver sensitivity in whole operating temperature range.The utility model also provides the dynamic gain control method of optical receiver, give the trans-impedance amplifier voltage control unit with the working temperature signal feedback of optical receiver, thereby dynamically adjust the gain of trans-impedance amplifier, and then improve receiver receiving sensitivity or saturated performance.
Description of drawings
Fig. 1 is the circuit diagram of the optical receiver of specific embodiment of the utility model one;
Fig. 2 is the circuit diagram of the optical receiver of specific embodiment of the utility model two.
Embodiment
Also by reference to the accompanying drawings the utility model is described in further details below by concrete execution mode.
Embodiment one:
As shown in Figure 1, photodiode voltage control unit 102 provides bias voltage for photodiode 101, photodiode 101 receiving optical signals, and light signal is converted to photoelectric current.Photoelectric current is by trans-impedance amplifier 105, and trans-impedance amplifier voltage control unit 104 provides operating voltage for trans-impedance amplifier 105, and the photoelectric current that trans-impedance amplifier 105 is exported photodiode 101 amplifies and is converted to voltage signal to be exported.In actual applications, this voltage signal further is sent to radiofrequency signal and is amplified and output unit, by amplifying with the further amplification of output unit to radiofrequency signal and handling output.
The temperature sensor 108 of present embodiment detects the temperature of optical receiver, and this temperature value analog quantity fed back to analog to digital converter 107, analog to digital converter 107 is input to register 106 with the temperature digital amount, central control unit 103 is inquired about pre-set temperature digital amount and trans-impedance amplifier voltage correspondence table, and removes to control trans-impedance amplifier voltage control unit 104 according to temperature digital amount output voltage control signal in the register 106.
Present embodiment is according to the working temperature of current optical receiver, temperature value signal is fed back to the trans-impedance amplifier voltage control unit, decide the working point of trans-impedance amplifier with this, the gain of trans-impedance amplifier can change with temperature in good time like this, is received in the purpose of improving optical receiver sensitivity in the whole operating temperature range thereby reach.
The course of work of present embodiment is as follows, the threshold value of design temperature numeral variable quantity, the collecting temperature analog quantity, convert the temperature simulation amount to the temperature digital amount by analog to digital converter, the temperature digital amount is write register, judge that whether the temperature digital variable quantity is greater than temperature digital quantitative change threshold value, if the temperature digital variable quantity is greater than temperature digital quantitative change threshold value, inquire about corresponding trans-impedance amplifier magnitude of voltage according to the temperature digital amount, and this value is fed back to the trans-impedance amplifier voltage control unit.
Embodiment two:
As shown in Figure 2, the difference of present embodiment and embodiment one is, also comprises the D/A expanding element, and its input connects central controller 109, and output connects trans-impedance amplifier voltage control unit 104.Behind the trans-impedance amplifier magnitude of voltage of present embodiment according to temperature digital amount inquiry correspondence, by D/A expanding element 109 this value is fed back to trans-impedance amplifier voltage control unit 104.
The course of work of present embodiment is as follows, the threshold value of design temperature numeral variable quantity, the collecting temperature analog quantity, convert the temperature simulation amount to the temperature digital amount by analog to digital converter, the temperature digital amount is write register, judge that whether the temperature digital variable quantity is greater than temperature digital quantitative change threshold value, if the temperature digital variable quantity is greater than temperature digital quantitative change threshold value, according to the corresponding trans-impedance amplifier magnitude of voltage of temperature digital amount inquiry, by the D/A expanding element this value is fed back to the trans-impedance amplifier voltage control unit.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (5)
1. optical receiver, it is characterized in that, comprise photodiode, the photodiode voltage control unit, trans-impedance amplifier, the trans-impedance amplifier voltage control unit, signal amplifier, central control unit, register, analog to digital converter and temperature sensor, the photodiode voltage control unit provides operating voltage for photodiode, photodiode receiving optical signals and output current signal, this current signal is converted into voltage signal through trans-impedance amplifier, amplify through the signal amplifier shaping then, temperature sensor detecting temperature value is also passed to analog to digital converter with the temperature value analog quantity, analog to digital converter output temperature digital quantity is to register, central control unit reads the temperature digital amount in the register, and inquire about pre-set trans-impedance amplifier voltage correspondence table, and feed back to the photodiode voltage control unit, central control unit also removes to control the trans-impedance amplifier voltage control unit according to temperature digital amount output voltage control signal in the register, makes the gain of trans-impedance amplifier to change with temperature in good time.
2. optical receiver according to claim 1, it is characterized in that, also comprise the D/A expanding element, described D/A expanding element is connected between central control unit and the trans-impedance amplifier voltage control unit, and central control unit is exported corresponding voltage value signal by the D/A expanding element and given the trans-impedance amplifier voltage control unit.
3. optical receiver according to claim 1 is characterized in that, described photodiode is avalanche photodide.
4. optical receiver according to claim 1 is characterized in that, described central control unit, register, analog to digital converter and temperature sensor are integrated in the single-chip microcomputer.
5. optical receiver according to claim 2 is characterized in that, described central control unit, register, analog to digital converter, temperature sensor and D/A expanding element are integrated in the single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320019873 CN203135890U (en) | 2013-01-15 | 2013-01-15 | Light receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320019873 CN203135890U (en) | 2013-01-15 | 2013-01-15 | Light receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203135890U true CN203135890U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320019873 Expired - Fee Related CN203135890U (en) | 2013-01-15 | 2013-01-15 | Light receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203135890U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600659A (en) * | 2020-04-30 | 2020-08-28 | 珠海格力电器股份有限公司 | Light receiving circuit |
| CN112585491A (en) * | 2019-09-05 | 2021-03-30 | 深圳市速腾聚创科技有限公司 | Laser radar signal receiving circuit, laser radar signal gain control method and laser radar |
| CN112702021A (en) * | 2020-12-10 | 2021-04-23 | 上海禾赛科技股份有限公司 | Circuit and method for acquiring breakdown voltage of photodiode |
-
2013
- 2013-01-15 CN CN 201320019873 patent/CN203135890U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112585491A (en) * | 2019-09-05 | 2021-03-30 | 深圳市速腾聚创科技有限公司 | Laser radar signal receiving circuit, laser radar signal gain control method and laser radar |
| CN111600659A (en) * | 2020-04-30 | 2020-08-28 | 珠海格力电器股份有限公司 | Light receiving circuit |
| CN112702021A (en) * | 2020-12-10 | 2021-04-23 | 上海禾赛科技股份有限公司 | Circuit and method for acquiring breakdown voltage of photodiode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170608 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Patentee after: SHENZHEN APAT OPTO-ELECTRONICS COMPONENTS Co.,Ltd. Address before: South South technology twelve road 518057 in Guangdong Province, Shenzhen high tech Industrial Park, No. 8 Building Frestech Patentee before: NEOPHOTONICS Corp. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20220115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |