CN1953355A - Send/receive module of optical communication and its correction method - Google Patents
Send/receive module of optical communication and its correction method Download PDFInfo
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- CN1953355A CN1953355A CNA2005101162339A CN200510116233A CN1953355A CN 1953355 A CN1953355 A CN 1953355A CN A2005101162339 A CNA2005101162339 A CN A2005101162339A CN 200510116233 A CN200510116233 A CN 200510116233A CN 1953355 A CN1953355 A CN 1953355A
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Abstract
The invention relates to a method for correcting optical communication receiving/sending module, which comprises that receiving an input voltage; checking one optical signal to generate an input power; based on input voltage, generating a compensate power; based on compensate power and input power, generating a correct power.
Description
Technical Field
The present invention relates to an optical transceiver module and a calibration method thereof, and more particularly, to an optical transceiver module capable of calibrating a working voltage and a calibration method thereof.
Background
Optical communication technology has the advantages of low radiation, high transmission speed, etc., and has gradually become the mainstream of communication technology.
Fig. 1 is a schematic diagram of a conventional optical communication transceiver module. The optical communication transceiver module 1 has a receiving unit 11, a transmitting unit 13 and a control unit 15. The receiving unit 11 receives an external optical signal 111 and converts the optical signal 111 into an electrical signal 112. The control unit 15 transmits the electrical signal 112 to a Host terminal (Host) 10. In addition, the control unit 15 controls the sending unit 13 to convert a data signal 131 from the host 10 from an electrical signal to an optical signal and send the optical signal. However, the Gain value (Gain) and the Offset value (Offset) of the receiving unit 11 of the optical communication transceiver module 1 often vary due to different internal components, and besides, the RSSI (Received signal strength Indicator) of the optical communication transceiver module 1 also affects along with the variation of the operating voltage of the receiving unit 11, for example, when the operating voltage is insufficient, the RSSI of the optical communication transceiver module 1 may be poor, so that the overall sensitivity of the optical communication transceiver module 1 is poor.
Although the prior art has been directed to solving the different problems of the internal components of the receiving unit 11, and adding the operations of gain compensation and offset compensation to the optical communication transceiver module 1 to solve the problem of the variation of the gain and offset, there is no solution at present for the influence caused by the variation of the operating voltage, so how to provide an optical communication transceiver module capable of correcting the operating voltage and the correction method thereof is one of the important issues at present.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical communication transceiver module and a calibration method thereof, which can calibrate an operating voltage to avoid the influence of the variation of the operating voltage.
Therefore, to achieve the above object, a calibration method for an optical communication transceiver module according to the present invention comprises the following steps: receiving an input voltage; detecting an optical signal and generating an input power according to the optical signal; generating a compensation power according to the input voltage; and generating a correction power according to the compensation power and the input power.
Therefore, to achieve the above object, another calibration method for an optical transceiver module according to the present invention comprises the following steps: receiving an input voltage; generating a compensation voltage according to the input voltage; and generating a correction voltage according to the input voltage and the compensation voltage.
Therefore, to achieve the above object, an optical communication transceiver module according to the present invention includes a receiving unit, a calibration unit and a control unit. The receiving unit receives an external input voltage, the correcting unit generates a correcting voltage according to the input voltage, and the control unit generates a corresponding correcting power according to the correcting voltage.
In view of the above, the optical communication transceiver module and the calibration method thereof according to the present invention generate a calibration power or voltage for the working voltage variation to compensate and calibrate the variation of the working voltage, thereby avoiding the influence caused by the variation of the working voltage.
Drawings
FIG. 1 is a block diagram of a conventional optical transceiver module;
FIG. 2 is a block diagram of an optical transceiver module according to a preferred embodiment of the present invention;
fig. 3 is a circuit diagram of an optical communication transceiver module according to a preferred embodiment of the invention;
fig. 4 is a block diagram of an optical transceiver module according to another preferred embodiment of the present invention;
fig. 5 is a flowchart illustrating a calibration method of an optical transceiver module according to a preferred embodiment of the invention; and
fig. 6 and 7 are schematic diagrams illustrating measurement of sensitivity curves of the optical transceiver module shown in fig. 4.
Detailed Description
An optical communication transceiver module and a calibration method thereof according to preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Fig. 2 and fig. 3 are block diagrams and circuit diagrams of an optical communication transceiver module according to a preferred embodiment of the invention. The optical communication transceiver module 2 receives an input voltage VccAs a working voltage; the optical communication transceiver module 2 includes a receiving unit 21, a transmitting unit 23, a control unit 25 and a calibration unit 27.
The receiving unit 21 receives the input voltage VccAnd an external optical signal 211, and converts the optical signal 211 into an electrical signal212; the calibration unit 27 is based on the input voltage VccTo generate a correction voltage VrWhen the input voltage V isccWhen the variation is changed (too low or too high), the compensation operation is performed to achieve the effect of correction.
The control unit 25 is based on the calibration voltage VrGenerates a corresponding calibration power and transmits the calibration power to a host 20. The control unit 23 is used to control the sending unit 23 to convert a data signal 231 from the host 20 into an optical signal by an electrical signal and send the optical signal.
As shown in fig. 3, the receiving unit 21 of the present embodiment has a fifth resistor R5And a light receiving element D1The fifth resistor R5A first terminal of receives the input voltage VccThe fifth resistor R5A second terminal of the second electrode is electrically connected to the light receiving element D1A first terminal of the light receiving element D1The second terminal of (a) is grounded. The light receiving element D1The first terminal generates a detection voltage VdThe detection voltage VdIs equal to the input voltage VccAnd a light receiving element D1The difference between the two induced electrical signals.
The correction unit 27 has a first resistor R1A second resistor R2An operational amplifier U1A third resistor R3And a fourth resistor R4. Wherein the first resistor R1Receives the input voltage V at a first terminalccThe first resistor R1Is electrically connected to the second resistor R2The first terminal of the second resistor R2To ground to form a voltage divider circuit. The second resistor R2The first terminal of the first transistor generates a reference voltage Vref(wherein, <math> <mrow> <msub> <mi>V</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>R</mi> <mn>2</mn> </msub> <mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> </mrow> </mfrac> <mo>×</mo> <msub> <mi>V</mi> <mi>CC</mi> </msub> <mo>,</mo> </mrow> </math> Vrefis the voltage value of the reference voltage, R1Is the resistance value, R, of the first resistor2Is the resistance value of the second resistor, VccThe voltage value of the input voltage).
In this embodiment, the reference voltage VrefIs an optimal operating voltage of the optical communication transceiver module 2, i.e. when the optical communication transceiver module 2 operates at the optimal operating voltage, the Received Signal Strength Indicator (RSSI) is better. It should be noted that the reference voltage VrefCan be adjusted according to different optical communication transceiver modules 2, wherein the reference voltage VrefCan be adjusted by adjusting the first resistor R1And the second resistor R2To generate different voltage values.
The operational amplifier U1Having a first input terminal1A second input terminal2And an output terminal output. In this embodiment, the first input terminal is provided1Is a non-inverting input terminal, the second input terminal2Is an inverting input terminal, the first input terminal1Electrically connected to the second resistor R2To receive the reference voltage Vref。
The third resistor R3Is electrically connected to the output terminal output, the third resistor R3Is electrically connected to the second input terminal2. The fourth resistor R4Is electrically connected to the second input terminal2The fourth resistor R4Is electrically connected to the receiving unit 21 to receive the detection voltage Vd。
In addition, the operational amplifier U1According to the reference voltage VrefAnd the detection voltage VdGenerating a correction voltage Vr。
Wherein, <math> <mrow> <msub> <mi>V</mi> <mi>r</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>R</mi> <mn>2</mn> </msub> <mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> </mrow> </mfrac> <mo>×</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>5</mn> </msub> </mrow> <mrow> <msub> <mi>R</mi> <mn>4</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>5</mn> </msub> </mrow> </mfrac> <mo>×</mo> <msub> <mi>V</mi> <mi>cc</mi> </msub> <mo>-</mo> <mfrac> <msub> <mi>R</mi> <mn>3</mn> </msub> <mrow> <msub> <mi>R</mi> <mn>4</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>5</mn> </msub> </mrow> </mfrac> <mo>×</mo> <msub> <mi>V</mi> <mi>cc</mi> </msub> <mo>-</mo> <mfrac> <msub> <mi>R</mi> <mn>3</mn> </msub> <msub> <mi>R</mi> <mn>4</mn> </msub> </mfrac> <msub> <mi>V</mi> <mi>d</mi> </msub> <mo>,</mo> </mrow> </math> Vris the voltage value of the correction voltage, VccIs the voltage value of the input voltage, VdIs the voltage value of the detection voltage, R1Is the resistance value, R, of the first resistor2Is the resistance value, R, of the second resistor3Is the resistance value, R, of the third resistor4Is the resistance value, R, of the fourth resistor5Is the resistance value of the fifth resistor.
In this example, let R be4+R5＝R1，R3＝R2And therefore, the first and second electrodes are, the correction voltage V can be obtainedrIdeally independent of the input voltage VccThereby enabling the optical communication transceiver module 2 to eliminate the input voltage VccTo achieve the effect of correction.
The control unit 25 is electrically connected to the calibration unit 27 and is configured to adjust the calibration voltage V according to the calibration voltage V transmitted by the calibration unit 27rAnd the control unit 25 performs gain compensation and offset compensation on the corrected power, and then sends the corrected power to the host 20 for subsequent processing.
The optical communication transceiver module 2 of this embodiment generates the calibration voltage V by the calibration unit 27rTherefore, the input voltage V can be eliminatedccThe effect of variation (too low or too high) can be achieved to correct the working voltage.
Fig. 4 is a block diagram of an optical communication transceiver module according to another preferred embodiment of the present invention. The optical communication transceiver module 3 receives an input voltage VccAs the working voltage, the optical communication transceiver module 3 has a receiving unit 31, a transmitting unit 33, a control unit 35 and a calibration unit 37.
In this embodiment, the receiving unit 31 receives the input voltage VccAnd an external optical signal 311, and converts the optical signal 311 into an electrical signal 312. The transmitting unit 33 converts a data signal 331 from a host 30 from an electrical signal to an optical signal through the control unit 35 for transmission.
The control unit 35 can be a control chip for receiving the electrical signal 312 transmitted from the receiving unit 31 and transmitting the electrical signal 312 to the host 30, and transmitting the data signal 331 from the host 30 to the sending unit 33.
The calibration unit 37 is based on the input voltage VccVaries to generate a corresponding correction voltage and transmits the correction voltage to the control unit 35, and the control unit 35 generates a corresponding correction work according to the correction voltageThe rate is sent to the host 30. In the embodiment, the calibration unit 37 is a software module stored in the control unit 35, but the calibration unit 37 may be separately stored in another control chip.
The calibration procedure of the optical communication transceiver module 3 of this embodiment is as follows: first, the optical communication transceiver module 3 receives the input voltage VccAs an operating voltage, the correction unit 37 then detects the input voltage VccTo generate a compensation voltage. Wherein, suppose V1For the compensation voltage, VrefIs a reference voltage, VccIs the input voltage, P1Is a predetermined parameter, then V1＝(Vref-Vcc)×P1。
In this embodiment, the reference voltage VrefThe predetermined parameter P is an optimal working voltage of the optical communication transceiver module 31Represents the input voltage VccAnd the light receiving element D1A constant of the relative relationship between the generated signals, the predetermined parameter P1Is an experimental data obtained by a plurality of experiments.
Then, the calibration unit 37 is based on the input voltage VccAnd the compensation voltage generates a correction voltage. Wherein the correction voltage is equal to the input voltage VccAnd the sum of the compensation voltages.
Finally, the control unit 35 receives the calibration voltage and generates a corresponding calibration power according to the calibration voltage, and after performing gain compensation and offset compensation on the calibration power, the control unit 35 sends the calibration power to a host 30 for subsequent processing.
When the input voltage V isccWhen the input voltage varies, the correction unit 37 generates the compensation voltage to compensate the input voltage VccSo as to achieve the effect of correcting the working voltage.
Referring to fig. 5, a calibration method for an optical transceiver module according to a preferred embodiment of the present invention can be implemented in the optical transceiver module 3 shown in fig. 4, for example, the calibration method includes the following steps:
step 91: the optical communication transceiver module 3 receives the input voltage Vcc
As a working voltage;
and step 92: the receiving unit 31 detects an optical signal 311 and generates an input power according to the optical signal 311, wherein the magnitude of the input power depends on the intensity of the optical signal 311;
step 93: the calibration unit 37 generates a compensation power according to an input voltage. Wherein, assume W2To compensate for power, VrefIs a reference voltage, VccIs the input voltage, P2Is a predetermined parameter, then W2＝(Vref-Vcc)×P2. In this embodiment, the compensation power is a power value, the reference voltage VrefThe predetermined parameter P is an optimal working voltage of the optical communication transceiver module 32Represents the input voltage VccAnd the light receiving element D1The electrical signal generated is related to the parameter in watts/volt. Furthermore, the predetermined parameter P2Experimental data obtained by a plurality of experiments.
Step 94: the control unit 35 generates a correction power according to the input power and the compensation power, and performs subsequent gain compensation and offset compensation, wherein the correction power is equal to the sum of the input power and the compensation power.
When the input voltage V isccWhen the input power generated by the receiving unit 31 varies due to variation, the calibration unit 37 generates the compensation power to compensate for the variation of the input power, so as to achieve the calibration effect.
Please refer to fig. 6 and fig. 7, which are schematic diagrams illustrating a measurement of the sensitivity curve of the optical transceiver module 3 in fig. 4. Assuming that the optimal operating voltage of the optical transceiver module 3 is 5V, as shown in fig. 6, a curve 81 represents a sensitivity curve when the optical transceiver module 3 operates at 5V, a curve 82 represents a sensitivity curve when the optical transceiver module 3 operates at 4.75V without calibration, and a curve 83 of fig. 7 represents a sensitivity curve after the optical transceiver module 3 operates at 4.75V and is calibrated. It can be seen from fig. 6 that when the calibration is not performed, the sensitivity of the optical communication transceiver module 3 slips down when the received power is-20 dBm, and cannot be maintained within the specifications of-3 dBm and 3dBm, and it can be seen from fig. 7 that even if the input voltage is corrected to 4.75V, the sensitivity can be maintained within the specifications of-3 dBm and 3dBm, and the influence of the operating voltage variation can be avoided.
In view of the above, the optical communication transceiver module and the calibration method thereof according to the present invention generate a calibration power or voltage for the working voltage variation to compensate and calibrate the variation of the working voltage, thereby avoiding the influence caused by the variation of the working voltage.
The foregoing is by way of example only, and not limiting. It is intended that all equivalent modifications or variations without departing from the spirit and scope of the present invention shall be included in the appended claims.
Claims (19)
1. A calibration method for an optical communication transceiver module includes the following steps:
receiving an input voltage;
detecting an optical signal and generating an input power according to the optical signal;
generating a compensation power according to the input voltage; and
generating a calibration power according to the compensation power and the input power.
2. The method of claim 1, wherein the step of generating the compensation power comprises;
setting a reference voltage;
providing a predetermined parameter; and
the compensation power is generated according to the reference voltage, the input voltage and the predetermined parameter.
3. The method of claim 2, wherein the compensation power is equal to a product of a difference between the reference voltage and the input voltage and the predetermined parameter.
4. A calibration method for an optical communication transceiver module includes the following steps:
receiving an input voltage;
generating a compensation voltage according to the input voltage; and
a correction voltage is generated according to the input voltage and the compensation voltage.
5. The method of calibrating an optical transceiver module of claim 4, further comprising the steps of:
generating a calibration power according to the calibration voltage.
6. The method of claim 4, wherein the step of generating the compensation voltage comprises:
setting a reference voltage;
providing a predetermined parameter; and
the compensation voltage is generated according to the reference voltage, the input voltage and the predetermined parameter.
7. The method of claim 6, wherein the compensation voltage is equal to a product of a difference between the reference voltage and the input voltage and the predetermined parameter.
8. The method of calibrating an optical transceiver module as claimed in claim 2 or 6, wherein the reference voltage is an optimal operating voltage of the optical transceiver module.
9. The method for calibrating an optical transceiver module of claim 1 or 4, further comprising the steps of:
performing offset compensation on the optical communication transceiver module; and
and performing gain compensation on the optical communication transceiver module.
10. The method as claimed in claim 1 or 4, wherein the optical transceiver module has a control unit for generating the calibration voltage according to the input voltage and the compensation voltage.
11. An optical communication transceiver module, comprising:
a receiving unit for receiving an external input voltage;
a correction unit for generating a correction voltage according to the input voltage; and
a control unit for generating a corresponding correction power according to the correction voltage.
12. The optical transceiver module as claimed in claim 11, wherein the calibration unit comprises an operational amplifier having a first input terminal, a second input terminal and an output terminal, the second input terminal receives the input voltage, the first input terminal receives a reference voltage, and the output terminal generates the calibration voltage.
13. The optical communication transceiver module of claim 11, wherein the calibration unit comprises:
a first resistor having a first end and a second end, the first end receiving the input voltage, and the second end generating a reference voltage;
a second resistor having a first end and a second end, the first end being electrically connected to the second end of the first resistor;
an operational amplifier having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is electrically connected to the second terminal of the first resistor;
a third resistor having a first end electrically connected to the output end and a second end electrically connected to the second input end; and
and the fourth resistor is provided with a first end and a second end, wherein the first end is electrically connected with the second input end, and the second end is electrically connected with the receiving unit.
14. The optical transceiver module as claimed in claim 12 or 13, wherein the first input terminal is a non-inverting input terminal and the second input terminal is an inverting input terminal.
15. The optical communication transceiver module of claim 11, wherein the receiving unit comprises:
a fifth resistor having a first end and a second end, the first end receiving the input voltage; and
and a light receiving element electrically connected to the second end of the fifth resistor.
16. The optical communication transceiver module of claim 11,
wherein the control unit performs offset compensation and gain compensation on the correction power.
17. The optical communication transceiver module of claim 11, further comprising a transmitter unit electrically connected to the control unit.
18. The optical communication transceiver module of claim 11, wherein the control unit is a control chip.
19. The optical communication transceiver module of claim 11, wherein the calibration unit is a software module stored in a chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005101162339A CN1953355A (en) | 2005-10-21 | 2005-10-21 | Send/receive module of optical communication and its correction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005101162339A CN1953355A (en) | 2005-10-21 | 2005-10-21 | Send/receive module of optical communication and its correction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391110A (en) * | 2012-05-07 | 2013-11-13 | 瑞昱半导体股份有限公司 | Transceiver and voltage correction method |
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2005
- 2005-10-21 CN CNA2005101162339A patent/CN1953355A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391110A (en) * | 2012-05-07 | 2013-11-13 | 瑞昱半导体股份有限公司 | Transceiver and voltage correction method |
| CN103391110B (en) * | 2012-05-07 | 2015-09-02 | 瑞昱半导体股份有限公司 | Transceiver and voltage correction method thereof |
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Open date: 20070425 |