CN112421354B - Extinction ratio adjusting system and method of optical module - Google Patents
Extinction ratio adjusting system and method of optical module Download PDFInfo
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- CN112421354B CN112421354B CN202011138893.8A CN202011138893A CN112421354B CN 112421354 B CN112421354 B CN 112421354B CN 202011138893 A CN202011138893 A CN 202011138893A CN 112421354 B CN112421354 B CN 112421354B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- Semiconductor Lasers (AREA)
Abstract
The application relates to an extinction ratio adjusting system and method of an optical module, which belong to the technical field of optical communication, and the extinction ratio adjusting system comprises: the detection comparison module is used for detecting the real-time temperature of the laser, comparing the real-time temperature with the preset temperature, and outputting a detection signal if the real-time temperature is higher than the preset temperature; and the control module is used for receiving the detection signal and reducing the output of the modulation current according to the detection signal. The application has the effect of automatically adjusting the extinction ratio.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to a system and a method for adjusting an extinction ratio of an optical module.
Background
With the rapid development of internet big data, people are eager for higher-speed optical networks, which promotes the vigorous development of the whole optical communication industry, and also forcefully promotes the independent research and development and innovative breakthrough of a plurality of core technologies including photoelectric device technology. Among them, the 100G optical module is a product of this large data age.
For an optical module, the extinction ratio is an important parameter that affects its accuracy. In theory, the optical transmitter should have no optical power output when transmitting the "0" code in the process of transmitting the digital signal, but the actual optical transmitter also has weak optical output when transmitting the "0" code due to the problems of the light source device itself or improper selection of the dc bias. Theoretical analysis shows that the receiver sensitivity is reduced due to the condition, the extinction ratio is an index for describing the performance of the optical transmitter, and the extinction ratio is the ratio of the optical power P1 when the laser transmits all '1' codes to the optical power P0 when the laser transmits all '0' codes.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: temperature differences can cause changes in circuit component parameters, affecting power and thereby causing changes in extinction ratio, such as temperature changes can cause changes in the laser's skew efficiency. The effect of the modulation current can change the temperature of the junction area of the laser, the extinction ratio can be reduced when the temperature is increased, and the receiving sensitivity of the optical module can be influenced when the extinction ratio is changed too much.
Disclosure of Invention
In order to adjust the extinction ratio, the application provides an extinction ratio adjusting system and method of an optical module.
In a first aspect, the present application provides an extinction ratio adjustment system for an optical module, which adopts the following technical scheme:
an extinction ratio adjustment system for an optical module, comprising:
the detection comparison module is used for detecting the real-time temperature of the laser, comparing the real-time temperature with the preset temperature, and outputting a detection signal if the real-time temperature is higher than the preset temperature;
and the control module is used for receiving the detection signal and reducing the output of the modulation current according to the detection signal.
By adopting the technical scheme, the bias current and the modulation current are two factors influencing the extinction ratio in the optical module, and can be simply understood as follows: extinction ratio = bias current/modulation current. When the temperature rises, the extinction ratio is reduced, the detection comparison module detects that the real-time temperature of the laser is higher than the preset temperature, the detection comparison module outputs a detection signal to the control module, the control module reduces the modulation current by reducing the output of the modulation current, the extinction ratio is increased, and then the extinction ratio is adjusted.
Optionally, the detection and comparison module includes a detection unit, a first resistor R1 and a comparator a1, the detection unit is used for detecting the real-time temperature of the laser, the detection unit is connected with the in-phase end of the comparator a1, one end of the first resistor R1 is connected with the inverting end of the comparator a1, the other end of the first resistor R1 is connected with the reference voltage Vf, and the output end of the comparator a1 is connected with the control module.
By adopting the technical scheme, the detection unit detects the real-time temperature of the laser, converts the real-time temperature into a voltage signal and applies the voltage signal to the non-inverting terminal of the comparator A1, the comparator A1 compares the voltage signal with the reference voltage of the non-inverting terminal, when the real-time temperature is higher than the preset temperature, the output state of the comparator A1 changes, and the comparator A1 outputs a detection signal to the control module.
Optionally, the detection unit includes a thermistor RT and a fifth resistor R5, one end of the thermistor RT is connected to the input voltage Vcc, the other end is connected to the non-inverting terminal of the comparator a1, one end of the fifth resistor R5 is connected to the non-inverting terminal of the comparator a1, and the other end is grounded.
By adopting the technical scheme, the temperature of the laser is detected by the thermistor RT, the resistance value of the thermistor RT changes along with the change of the temperature, the partial pressure of the thermistor RT changes, and then the voltage of the in-phase end of the comparator A1 changes.
Optionally, the control module includes a second resistor R2, an amplifier a2, a third resistor R3, and a resistance value adjusting unit, one end of the second resistor R2 is connected to the in-phase end of the amplifier a2, the other end of the second resistor R2 is grounded, the in-phase end of the amplifier a2 is connected to the input modulation current Iin, the inverting end of the amplifier a2 is grounded, one end of the third resistor R3 is connected to the in-phase end of the amplifier a2, the other end of the third resistor R3 is connected to the output end of the amplifier a2, the resistance value adjusting unit is connected in parallel to the third resistor R3, the resistance value adjusting unit is connected to the output end of the comparator a1, and the resistance value adjusting unit is configured to adjust the total resistance value of the parallel branches.
By adopting the technical scheme, the resistance value adjusting unit and the third resistor R3 act to form the total resistance value of the parallel branch, the input modulation current Iin is connected with the in-phase end of the amplifier A2, the input modulation current Iin is amplified by the amplifier A2 and then acts on the laser, the output current Iout = Iin ((R2 + total resistance value of the parallel branch)/R2) is output, the total resistance value of the parallel branch is reduced, Iout is reduced, and the extinction ratio is increased; the total resistance value of the parallel branch is increased, Iout is increased, and the extinction ratio is reduced. The comparator A1 outputs a corresponding detection signal to the resistance value adjusting unit, and the resistance value adjusting unit adjusts the total resistance value of the parallel branch, so that the output current Iout is changed.
Optionally, the resistance value adjusting unit includes a switch unit and a fourth resistor R4, the switch unit is connected in series with the fourth resistor R4, and the switch unit is connected with the output end of the comparator a 1.
By adopting the above technical scheme, the switching unit controls the on-off of the branch where the fourth resistor R4 is located, when the branch where the fourth resistor R4 is located is off, the output current Iout = Iin · ((R2 + R3)/R2), and when the branch where the fourth resistor R4 is located is on, the total resistance value of the output current Iout = Iin · ((R2 + R3// R4)/R2) after the parallel connection of R3 and R4 is smaller than the resistance value of R3, so that the output current Iout is reduced after the branch where the fourth resistor R4 is located is on.
Optionally, the switch unit is a triode or an MOS transistor.
By adopting the technical scheme, the on-off of the branch where the fourth resistor R4 is located is further controlled by controlling the on-off of the triode and the MOS tube.
Optionally, the switching unit is an MOS transistor, a source of the MOS transistor is connected to the output terminal of the amplifier a2 through a fourth resistor R4, a drain of the MOS transistor is connected to the non-inverting terminal of the amplifier a2, and a base of the MOS transistor is connected to the output terminal of the comparator a 1.
By adopting the technical scheme, the MOS tube has small loss and is convenient to start. The comparator A1 outputs a high level to the base of the MOS transistor, the MOS transistor is conducted, and the branch where the fourth resistor R4 is located is connected.
In a second aspect, the present application provides a method for adjusting an extinction ratio of an optical module, which adopts the following technical scheme:
an extinction ratio adjusting method of an optical module is suitable for the extinction ratio adjusting system and comprises the following steps:
s1: acquiring the real-time temperature of the laser, and comparing the real-time temperature with a preset temperature;
s2: and reducing the output of the modulation current according to the comparison result.
By adopting the technical scheme, the bias current and the modulation current are two factors influencing the extinction ratio in the optical module, and can be simply understood as follows: extinction ratio = bias current/modulation current. When the temperature rises, the extinction ratio is reduced, the real-time temperature of the laser is detected to be higher than the preset temperature, the output of the modulation current is reduced according to the result, the modulation current is reduced, the extinction ratio is increased, and then the extinction ratio is adjusted.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the temperature rises, the extinction ratio is reduced, the detection comparison module detects that the real-time temperature of the laser is higher than the preset temperature, the detection comparison module outputs a detection signal to the control module, the control module reduces the modulation current by reducing the output of the modulation current, the extinction ratio is increased, and then the extinction ratio is adjusted.
And 2, the MOS tube has low loss and is convenient to start. The comparator A1 outputs a high level to the base of the MOS transistor, the MOS transistor is conducted, the branch where the fourth resistor R4 is located is connected, the output current Iout is reduced, and the extinction ratio is increased.
Drawings
Fig. 1 is a block diagram of an extinction ratio adjustment system of an optical module according to an embodiment of the present application;
fig. 2 is a circuit diagram of an extinction ratio adjustment system of an optical module according to an embodiment of the present application.
Description of reference numerals: 1. a detection comparison module; 2. a control module; 3. a detection unit; 4. a resistance value adjusting unit; 5. a switch unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-2 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses an extinction ratio adjusting system of an optical module. Referring to fig. 1, the extinction ratio adjustment system includes:
and the detection comparison module 1 is used for detecting the real-time temperature of the laser, comparing the real-time temperature with the preset temperature, and outputting a detection signal if the real-time temperature is higher than the preset temperature.
And the control module 2 is used for receiving the detection signal and reducing the output of the modulation current according to the detection signal.
Referring to fig. 2, the detection comparing module 1 includes a detecting unit 3, a first resistor R1 and a comparator a1, wherein the detecting unit 3 includes a thermistor RT and a fifth resistor R5, the thermistor RT is a positive temperature coefficient thermistor, and the thermistor RT is used for detecting the real-time temperature of the laser.
One end of the thermistor RT is connected to the input voltage Vcc, the other end is connected to the non-inverting terminal of the comparator a1, one end of the fifth resistor R5 is connected to the non-inverting terminal of the comparator a1, and the other end is grounded. One end of the first resistor R1 is connected with the inverting end of the comparator A1, the other end is connected with the reference voltage Vf, and the output end of the comparator A1 is connected with the control module 2.
The thermistor RT detects the temperature of the laser, and the resistance of the thermistor RT increases as the temperature increases, and the divided voltage on the thermistor RT also increases, which acts on the non-inverting terminal of the comparator a 1. When the temperature of the laser is higher than the predetermined temperature, the voltage of the non-inverting terminal of the comparator A1 is greater than the reference voltage of the inverting terminal, the output state of the comparator A1 changes, the comparator A1 outputs a high level, that is, the comparator A1 outputs a detection signal to the control module 2.
The control module 2 includes a second resistor R2, an amplifier a2, a third resistor R3, and a resistance value adjusting unit 4, where the amplifier a2 is a current amplifier, the resistance value adjusting unit 4 includes a switch unit 5 and a fourth resistor R4, the switch unit 5 is connected in series with the fourth resistor R4, the switch unit 5 is a triode or a MOS transistor, and in this embodiment, the switch unit 5 is an N-type MOS transistor.
One end of the second resistor R2 is connected with the in-phase end of the amplifier A2, and the other end is grounded; the in-phase end of the amplifier A2 is connected with the input modulation current Iin, and the inverting end of the amplifier A2 is grounded; one end of the third resistor R3 is connected with the non-inverting end of the amplifier A2, and the other end of the third resistor R3 is connected with the output end of the amplifier A2; the source electrode of the MOS tube is connected with the output end of the amplifier A2 through a fourth resistor R4, the drain electrode of the MOS tube is connected with the in-phase end of the amplifier A2, and the base electrode of the MOS tube is connected with the output end of the comparator A1.
The input modulation current Iin is amplified by an amplifier a2 and then acts on the laser, when the temperature of the laser is lower than a predetermined temperature, the comparator a1 outputs a low level, the MOS transistor is turned off, the branch where the fourth resistor R4 is located is disconnected, and the output current Iout = Iin. ((R2 + R3)/R2). When the temperature of the laser is higher than the preset temperature, the comparator A1 outputs a high level, the MOS tube is conducted, the branch where the fourth resistor R4 is located is connected, the output current Iout = Iin. ((R2 + R3// R4)/R2), and the total resistance value of the third resistor R3 and the R4 after the fourth resistor is connected in parallel is smaller than that of the R3 third resistor, so that the output current Iout is reduced after the branch where the fourth resistor R4 is located is connected.
The implementation principle of the extinction ratio adjusting system of the optical module in the embodiment of the application is as follows: bias current and modulation current are two factors influencing extinction ratio in an optical module, and can be simply understood as follows: extinction ratio = bias current/modulation current. When the temperature of the laser is higher than the preset temperature, the partial voltage on the thermistor RT is increased, the voltage at the in-phase end of the comparator A1 is larger than the reference voltage at the anti-phase end, the output state of the comparator A1 is changed, the comparator A1 outputs a high level to the MOS tube, the MOS tube is conducted, the branch where the fourth resistor R4 is located is conducted, the output current Iout = Iin. ((R2 + R3// R4)/R2), the output current Iout is reduced, the output current acts on the laser, the modulation current is reduced, the extinction ratio is increased, and therefore the extinction ratio is adjusted.
The embodiment of the application further discloses an extinction ratio adjusting method of the optical module, which is applicable to the extinction ratio adjusting system, and the extinction ratio adjusting method comprises the following steps:
s1: and acquiring the real-time temperature of the laser, and comparing the real-time temperature with the preset temperature. The temperature of the laser is detected through the thermistor RT, and the temperature of the laser is fed back in real time.
S2: and reducing the output of the modulation current according to the comparison result. When the real-time temperature of the laser is detected to be higher than the preset temperature, the total resistance of the branch circuit where the third resistor R3 and the fourth resistor R4 are located is reduced by controlling the conduction of the MOS tube, the amplification factor of the amplifier A2 is reduced, and the output modulation current is reduced.
The implementation principle of the extinction ratio adjusting method of the optical module in the embodiment of the application is as follows: bias current and modulation current are two factors influencing extinction ratio in an optical module, and can be simply understood as follows: extinction ratio = bias current/modulation current. When the temperature rises, the extinction ratio is reduced, the real-time temperature of the laser is detected to be higher than the preset temperature, the output of the modulation current is reduced according to the result, the modulation current is reduced, the extinction ratio is increased, and then the extinction ratio is adjusted.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (5)
1. An extinction ratio adjustment system of an optical module, characterized in that: the method comprises the following steps:
the detection comparison module (1) is used for detecting the real-time temperature of the laser in the optical module, comparing the real-time temperature with a preset temperature, and outputting a detection signal if the real-time temperature is higher than the preset temperature;
the control module (2) is used for receiving the detection signal and reducing the output of the modulation current according to the detection signal;
the detection comparison module (1) comprises a detection unit (3), a first resistor R1 and a comparator A1, wherein the detection unit (3) is used for detecting the real-time temperature of a laser in an optical module, the detection unit (3) is connected with the in-phase end of the comparator A1, one end of the first resistor R1 is connected with the inverting end of the comparator A1, the other end of the first resistor R1 is connected with a reference voltage Vf, and the output end of the comparator A1 is connected with the control module (2);
the control module (2) comprises a second resistor R2, an amplifier A2, a third resistor R3 and a resistance value adjusting unit (4), wherein one end of the second resistor R2 is connected with the in-phase end of the amplifier A2, the other end of the second resistor R2 is grounded, the in-phase end of the amplifier A2 is connected with the input modulation current Iin, the inverting end of the amplifier A2 is grounded, one end of the third resistor R3 is connected with the in-phase end of the amplifier A2, the other end of the third resistor R3 is connected with the output end of the amplifier A2, the resistance value adjusting unit (4) is connected with the third resistor R3 in parallel, the resistance value adjusting unit (4) is connected with the output end of the comparator A1, and the resistance value adjusting unit (4) is used for adjusting the total resistance value of the parallel branches;
the resistance value adjusting unit (4) comprises a switch unit (5) and a fourth resistor R4, the switch unit (5) and the fourth resistor R4 are connected in series, and the switch unit (5) is connected with the output end of the comparator A1.
2. The system of claim 1, wherein: the detection unit (3) comprises a thermistor RT and a fifth resistor R5, one end of the thermistor RT is connected with an input voltage Vcc, the other end of the thermistor RT is connected with the in-phase end of a comparator A1, one end of the fifth resistor R5 is connected with the in-phase end of a comparator A1, and the other end of the fifth resistor R5 is grounded.
3. The system of claim 1, wherein: the switch unit (5) is a triode or an MOS tube.
4. The system of claim 3, wherein: the switch unit (5) is an MOS (metal oxide semiconductor) transistor, the source electrode of the MOS transistor is connected with the output end of the amplifier A2 through a fourth resistor R4, the drain electrode of the MOS transistor is connected with the in-phase end of the amplifier A2, and the base electrode of the MOS transistor is connected with the output end of the comparator A1.
5. An extinction ratio adjustment method for an optical module is characterized in that: an extinction ratio adjustment system adapted for use in any one of claims 1 to 4, including the steps of:
s1: acquiring the real-time temperature of a laser in an optical module, and comparing the real-time temperature with a preset temperature;
s2: and reducing the output of the modulation current according to the comparison result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011138893.8A CN112421354B (en) | 2020-10-22 | 2020-10-22 | Extinction ratio adjusting system and method of optical module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011138893.8A CN112421354B (en) | 2020-10-22 | 2020-10-22 | Extinction ratio adjusting system and method of optical module |
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| CN112421354A CN112421354A (en) | 2021-02-26 |
| CN112421354B true CN112421354B (en) | 2021-09-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7324570B2 (en) * | 2004-03-05 | 2008-01-29 | Finisar Corporation | Continuous temperature compensation for a laser modulation current |
| JP4066979B2 (en) * | 2004-06-03 | 2008-03-26 | セイコーエプソン株式会社 | Light emitting element driving circuit, communication apparatus, and light emitting element driving method |
| TWI356410B (en) * | 2007-11-15 | 2012-01-11 | Ind Tech Res Inst | Light transmitter and an automatic power control c |
| CN103078249B (en) * | 2013-01-06 | 2015-04-22 | 青岛海信宽带多媒体技术有限公司 | Method and device for generating temperature lookup table of optical module |
| CN106451061B (en) * | 2016-10-28 | 2018-12-21 | 中国电子科技集团公司第四十四研究所 | Optical module automatic temperature compensation device and its control method |
| CN207082718U (en) * | 2017-06-13 | 2018-03-09 | 武汉矽晶辰光科技有限公司 | A kind of control circuit of laser diode drive extinction ratio control |
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