CN108494492B - Optical module - Google Patents
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- CN108494492B CN108494492B CN201810252740.2A CN201810252740A CN108494492B CN 108494492 B CN108494492 B CN 108494492B CN 201810252740 A CN201810252740 A CN 201810252740A CN 108494492 B CN108494492 B CN 108494492B
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- 230000004048 modification Effects 0.000 description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
- H04B10/807—Optical power feeding, i.e. transmitting power using an optical signal
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Abstract
The invention discloses an optical module, comprising: a light emitting module; the light emitting module includes: the light emitter and the current control module connected with the light emitter, wherein the current control module at least comprises a first current switch circuit and a second current switch circuit; the driving circuit is used for outputting unequal first driving current and second driving current to the light emitter respectively; the optical transmitter transmits a first optical signal and a second optical signal with different optical power values under the drive of the first drive current and the second drive current; for characterizing the different first and second digital quantities. Because the current control module comprises at least two current switch circuits, and the output driving currents of the current switch circuits are not equal, the light power values of the light signals emitted by the light emitters driven by the output driving currents of the current switch circuits are not equal, therefore, the optical module provided by the embodiment of the invention can transmit at least three digital signals once, and the data transmission efficiency is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an optical module.
Background
The optical module is a photoelectric conversion module, and is used for converting an electric signal of sending end equipment into an optical signal, transmitting the optical signal through an optical fiber, and converting the optical signal back into the electric signal for use by receiving end equipment after the signal reaches a destination. The electrical signal to be transmitted is converted into an optical signal and then transmitted in the optical fiber, and compared with a cable, the optical fiber has the incomparable advantages of the cable in terms of transmission distance and transmission speed, so that the optical module is widely applied to the field of data communication.
However, the optical module used at present can only transmit two kinds of data by on or off of an optical signal in each communication, that is, information of 1 bit is transmitted each time; there is a limit to increase data transmission efficiency by reducing the communication interval, and thus, the data transmission efficiency is low.
Disclosure of Invention
The embodiment of the invention provides an optical module, which is used for improving the transmission efficiency of the optical module.
In a first aspect, an embodiment of the present invention provides an optical module, including: a light emitting module; the light emitting module includes: the light emitter and the current control module connected with the light emitter, wherein the current control module at least comprises a first current switch circuit and a second current switch circuit; wherein,
the first current switch circuit is used for outputting a first driving current to the light emitter;
the second current switch circuit is used for outputting a second driving current to the light emitter;
the optical transmitter is used for transmitting a first optical signal under the driving of the first driving current and transmitting a second optical signal under the driving of the second driving current; the optical power value of the first optical signal is used for indicating a first digital quantity, and the optical power value of the second optical signal is used for indicating a second digital quantity;
the first drive current is less than the second drive current; the optical power value of the first optical signal is less than the optical power value of the second optical signal to indicate that the first digital quantity is different from the second digital quantity.
In a possible implementation manner, in the optical module provided in the embodiment of the present invention, the first current switch circuit and the second current switch circuit respectively output the first driving current or the second driving current to the optical emitter at different time periods.
In a possible implementation manner, in the foregoing optical module provided in an embodiment of the present invention, the optical transmitting module further includes: and the bias current generator is connected with the light emitter and used for providing bias current for the light emitter, and the bias current is used for driving the light emitter to work.
In a possible implementation manner, in the optical module provided in an embodiment of the present invention, the current control module includes 2N-1 current switch circuits, and driving currents output to the optical transmitter by the current switch circuits are not equal to each other, where N is a positive integer greater than or equal to 2.
In a possible implementation manner, in the foregoing optical module provided in an embodiment of the present invention, the optical module further includes: and the control module is used for controlling the communication of the first current switch circuit or the second current switch circuit according to a digital quantity in the transmitted digital signal so as to control the first driving current or the second driving current to be output to the light emitter according to the digital quantity.
In a possible implementation manner, in the optical module provided in an embodiment of the present invention, the light emitter is a laser diode or a light emitting diode.
The invention has the following beneficial effects:
the optical module provided by the embodiment of the invention comprises: a light emitting module; the light emitting module includes: the light emitter and the current control module connected with the light emitter, wherein the current control module at least comprises a first current switch circuit and a second current switch circuit; the first current switch circuit is used for outputting a first driving current to the light emitter; a second current switching circuit for outputting a second driving current to the light emitter; the optical transmitter is used for transmitting a first optical signal under the driving of a first driving current and transmitting a second optical signal under the driving of a second driving current; the optical power value of the first optical signal is used for indicating a first digital quantity, and the optical power value of the second optical signal is used for indicating a second digital quantity; the first drive current is less than the second drive current; the optical power value of the first optical signal is smaller than the optical power value of the second optical signal so that the first digital quantity is different from the second digital quantity. Because the current control module comprises at least two current switch circuits, and the output driving currents of the current switch circuits are not equal, the light power values of the light signals emitted by the light emitters driven by the output driving currents of the current switch circuits are not equal, therefore, the optical module provided by the embodiment of the invention can transmit at least three digital signals once, and the data transmission efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical transmit module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an optical transmitter module according to an embodiment of the present invention;
fig. 4 is a second schematic circuit diagram of an optical transmitter module according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of an optical transmit module according to an embodiment of the present invention;
fig. 6 is a third schematic circuit diagram of an optical transmitter module according to an embodiment of the invention;
fig. 7 is a second schematic structural diagram of an optical module according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a light receiving module according to an embodiment of the present invention;
fig. 9 is a second schematic structural diagram of a light receiving module according to an embodiment of the present invention;
fig. 10 is a schematic diagram of the optical power amplitude provided by the embodiment of the invention.
Detailed Description
To solve the problems in the prior art, embodiments of the present invention provide an optical module, so as to improve transmission efficiency thereof.
An optical module according to an embodiment of the present invention will be specifically described below with reference to the drawings.
As shown in fig. 1, an optical module provided in an embodiment of the present invention includes: a light emitting module 11 and a light receiving module 12. Further, as shown in fig. 2, the light emitting module 11 includes: an optical transmitter 111 and a current control module 112 connected with the optical transmitter; the current control module includes at least a first current switch circuit 112a and a second current switch circuit 112 b.
The first current switch circuit 1112a is configured to output a first driving current to the light emitter 111;
a second current switch circuit 112b for outputting a second driving current to the light emitter 111;
an optical transmitter 111 for transmitting a first optical signal driven by a first driving current and a second optical signal driven by a second driving current;
the optical power value of the first optical signal is used for indicating a first digital quantity, and the optical power value of the second optical signal is used for indicating a second digital quantity; the first drive current is less than the second drive current; the optical power value of the first optical signal is less than the optical power value of the second optical signal to indicate that the first digital quantity is different from the second digital quantity.
In the optical transmitter provided in the embodiment of the present invention, the current control modules at least include two current switch modules, and the current switch modules control currents of the two current switch modules to output unequal driving currents to the optical transmitter, so that optical power values of optical signals transmitted by the optical transmitter are different, and different digital quantities in the data signals are represented by different optical power values. Therefore, the optical module provided by the embodiment of the invention can transmit at least three different digital quantities, and compared with the optical module which can only transmit two digital quantities in the prior art, the optical module provided by the embodiment of the invention can realize higher communication efficiency of the optical module.
In practical application, the number of the current switch circuits included in the current control module may be set according to the type of digital quantity in digital signals required to be transmitted in practical application, for example, when 2-bit digital signals are required to be transmitted at a single time, that is, the types of digital quantity are four, three current switch circuits may be adopted, the driving current output by each current switch circuit to the optical transmitter is respectively unequal, and the three current switch circuits are sequentially closed and are all opened in four states, so that the optical transmitter transmits four optical signals with unequal optical power values, and the four digital quantities are represented. Other implementation cases are similar to the above examples, and are not listed, and the number of the current switch circuits is set according to actual situations in practical applications.
Specifically, as shown in fig. 3, a schematic circuit diagram of an optical transmitting module according to an embodiment of the present invention is provided. As shown in fig. 3, the current switching circuit (112a or 112b) may be composed of a constant current source and a switch connected in series thereto, the switch being a switch that controls the constant current source to output a driving current to the light emitter 111. When the switch is closed, the constant current source may output a current to the light emitter 111 to drive the light emitter to emit a light signal.
Taking the structure of the optical transmission module shown in fig. 4 as an example, the current control module 112 includes three current switch circuits (112a, 112b, 112c), that is, the optical transmission module includes three constant current sources (Imod1, Imod2, Imod3), output currents of the three constant current sources are not equal, in practical application, when sending the digital quantity "00", switches of the three constant current sources are all turned off, the optical transmitter only transmits a very weak optical signal, and the optical power value is P1, which is similar to background noise; when the digital quantity is transmitted to be '01', the constant current source Imod1 is switched on, the constant current sources Imod2 and Imod3 are switched off, and the light emitter can emit light signals with the light power value of P2; when the digital quantity is transmitted to be 10, the constant current source Imod2 is switched on, the constant current sources Imod1 and Imod3 are switched off, and the light emitter can emit light signals with the light power value of P3; when the digital quantity '11' is transmitted, the constant current source Imod3 is turned on, and the constant current sources Imod1 and Imod2 are turned off, and the light emitter can emit the light signal with the light power value of P4. Therefore, the information quantity carried by the optical signal transmitted by the optical module at a time is 2 bit.
In specific implementation, referring to fig. 2, the first current switch circuit 112a and the second current switch circuit 112b respectively output the first driving current or the second driving current to the light emitter 111 at different time periods. That is, each current switch circuit in the light emitting module provided in the embodiment of the present invention does not output a driving current to the light emitter at the same time, and the light emitter is driven by only one current switch circuit to emit a light signal at a time, so that the amplitude of the light module is more conveniently modulated before communication, and the control of the light power value of each light signal during communication is facilitated.
Preferably, in the optical module provided in the embodiment of the present invention, the current control module may include 2N-1 current switch circuits, and the driving currents output by the current switch circuits to the optical transmitter are not equal, where N is a positive integer greater than or equal to 2.
The current control module in the optical module as illustrated above includes three current switch circuits (i.e., N is 2), and may transmit 2bit data, so that when N is 3, that is, the optical module includes 5 current switch circuits, a requirement for transmitting 3bit data may be met, and so on, after the number of bits of data to be transmitted is determined, the number of current switch circuits to be set may be obtained accordingly, and in practical application, selection is performed as needed, which is not limited herein.
Further, as shown in fig. 5, the light emitting module further includes: a bias current generator 113 connected to the light emitter 111; the bias current generator 113 is configured to provide a bias current to the light emitter 111, and the bias current is used to drive the light emitter 111 to operate. A schematic circuit diagram of an optical transmit module with a bias current generator can be seen in fig. 6. The bias current generator 113 may adopt a bias current source, which always keeps working to ensure that the working current of the light emitter 111 can be in a proper range. When all three constant current sources are switched off, the light emitter can emit a weak light signal with the light power of P1 as described above due to the action of the bias current. In addition, the optical transmitting module may further include a bias resistor R as shown in fig. 6 for protecting the circuit.
In practical applications, as shown in fig. 7, the optical module provided in the present invention further includes: and the control module 13 is connected with the light emitting module 11, and the control module 13 is configured to control the connection of the first current switch circuit 112a or the second current switch circuit 112b according to a digital quantity in the transmitted digital signal, so as to control the output of the first driving current or the second driving current to the light emitter according to the digital quantity.
In specific application, the control module 13 may be connected to the first current switch circuit and the second current switch circuit, respectively, and is configured to control on/off of each current switch circuit according to different digital quantities of the digital signal, so that different optical power values of the transmitted optical signal correspondingly represent different digital quantities. The control module 13 may be a Micro Control Unit (MCU), or may be other modules or devices having the above control function, and is not limited herein.
In practical applications, the light emitter 111 may employ a laser diode. The laser diode has the advantages of low threshold current, high output power, small size and the like, and is favorable for integration of the light emitting module. In addition, the light emitter 111 may also adopt other light emitters or light emitting devices such as a light emitting diode, a semiconductor laser, and the like, which is not limited herein.
The optical module comprises a light emitting module and a light receiving module; the above is an explanation of the structure and the working principle of the optical transmitting module in the optical module, and in specific application, corresponding improvements are also needed for the optical receiving module in the optical module serving as a signal receiving end, so as to adapt to the reception of the optical signal transmitted by the improved optical transmitting module.
Specifically, as shown in fig. 8, the light receiving module 12 includes: a photodetector 121, and a decider 122 connected to the photodetector 121.
The photodetector 121 is configured to convert a received optical signal into an electrical signal;
and a decision device 122 for comparing the received electrical signal with a preset threshold value to output a restored digital signal.
Further, as shown in fig. 9, the light receiving module 12 further includes: an amplifying circuit 123; the photodetector 121 is connected to the determiner 122 through an amplifying circuit 123; the amplifying circuit 123 is configured to amplify the output signal of the photodetector 121 and send the amplified signal to the decision device 122.
Specifically, the optical receiving module is used for converting the transmitted weak optical signal into an electrical signal, and amplifying and shaping the electrical signal to restore the electrical signal into an original digital signal carried by an optical carrier. In the embodiment of the present invention, after receiving the weak optical signal transmitted by the optical fiber and converting the weak optical signal into an electrical signal, the photodetector 121 firstly amplifies the electrical signal, and then performs a shaping and recovering process on the amplified electrical signal to analyze the original digital signal. The decision device 122 analyzes the amplified electrical signal into an original digital signal by using a multi-threshold comparison method.
The photodetector 121 may be a photodiode or an avalanche photodiode. The responsivity of the photodiode can be in the range of 0.65-0.97A/W, the sensitivity of the photoelectric detector can be improved by 6-10dB by adopting the avalanche diode, the photoelectric detector can be flexibly applied according to the actual requirement in the actual application, and the photoelectric detector or the photoelectric detection device with other parameters can be adopted besides the two types of photoelectric detectors, and the limitation is not made here.
Still take the case of 2-bit data transmission of the optical module as an example for explanation, in the optical module serving as a signal sending end, the current control module includes three current switch circuits, which are divided into a first current switch circuit, a second current switch circuit and a third current switch circuit; when all of the three current switch circuits are opened, the optical power value of the emitted optical signal is P1, and when the first current switch circuit, the second current switch circuit, and the third current switch circuit are closed in this order, the optical power values of the emitted optical signal are P2, P3, and P4 in this order, see fig. 10. Because the optical signal emitted each time cannot be guaranteed to be exactly the four optical power values due to the influence of factors such as the temperature characteristic of the optical emitting module, three thresholds, i.e., d1, d2 and d3 in fig. 10, are set equivalently, and the optical power value with the optical power value smaller than the threshold d1 is regarded as the same optical signal and has the same function as P1 to represent the same digital quantity (for example, "00"); accordingly, the effect of the optical signal having an optical power value greater than d1 and less than d2 is the same as that of P2 (e.g., for characterizing the digital quantity "01"); the optical signal with an optical power value greater than d2 and less than d3 functions the same as P3 (e.g., to characterize the digital quantity "10"); the optical signal having an optical power value greater than the threshold value d3 functions the same as P4 (e.g., to characterize the digital quantity "11"). In a specific implementation, the threshold value may be set as an average value of two adjacent optical power values.
Correspondingly, in the optical module at the signal receiving end, since the propagation path of the optical signal is attenuated and is affected by the temperature characteristics of the optical receiving module and other factors, the optical power value of the optical signal received by the optical receiving module is not necessarily exactly equal to the optical power value of the optical signal at the time of transmission, three thresholds of the electrical signal corresponding to the optical power threshold, for example, e1, e2, and e3, may be set in the determiner, and the setting of multiple thresholds in the determiner may be implemented in a software or hardware manner. The software mode is relatively simple, and the program setting can be performed aiming at the decision device.
After the optical signal is converted into the electrical signal, the amplitude of the electrical signal is compared with the three threshold values, and when the amplitude of the electrical signal is smaller than e1, the transmitted digital quantity is considered to be '00'; when the amplitude of the electrical signal is greater than e1 and less than e2, the transmitted digital quantity is considered to be "01"; when the amplitude of the electrical signal is greater than e2 and less than e3, the transmitted digital quantity is considered to be "10"; when the magnitude of the electrical signal is greater than e3, the transmitted digital quantity is considered to be "11". Thus, transmission of a digital signal including 2 bits in digital quantity can be completed.
If the optical power of the transmitted optical signal P2, the optical power of the returned optical signal is less than the threshold d1, and/or the optical power of the transmitted optical signal P3, the optical power of the returned optical signal is less than the threshold d2, and/or the optical power of the transmitted optical signal P4, the optical power of the returned optical signal is less than the threshold d3, then the optical power of each transmitted optical signal needs to be adjusted. Specifically, the amplitudes of the optical powers of P2, P3, and P4 may be increased, and the differences between P1 and P2, between P2 and P3, and between P3 and P4 may be increased accordingly, and the above steps of emitting, returning, and modulating the amplitude may be repeated until the optical powers of the returned optical signal and the last emitted optical signal after the adjustment are equal to each other.
On the other hand, the amplitude modulation of the optical module is important as to whether the optical module can normally communicate subsequently. The following will describe an amplitude modulation communication method of the above optical module provided by an embodiment of the present invention.
The optical transmitter as the signal transmitting end sequentially transmits optical signals with optical power values of P1, P2, P3, and P4 to the optical receiver as the signal receiving end at the optical power value level shown in fig. 10, and waits for a return signal of the optical module at the signal receiving end. Wherein, P1, P2, P3 and P4 are sent in sequence as one emission period.
Due to attenuation of the propagation path of the optical signal, the optical power of the optical signal received by the optical receiving module and the optical power difference between the optical signals may change, which may cause an error in interpreting the signal and affect the accuracy of communication. The optical power amplitude of each optical signal needs to be adjusted.
Specifically, when the optical power value of the backhaul optical signal received by the optical module at the signal transmitting end and the optical power value of the optical signal at the time of transmission are not in the same threshold interval, it indicates that a communication error is caused by using the current optical power value, and at this time, the optical power value of the transmitted optical signal needs to be adjusted. In practical applications, the driving current output by each current switch circuit can be increased, so that the optical power value of the optical signal emitted by each driving current driven optical transmitter is increased, and at the same time, the optical power difference between the optical signals needs to be increased. For example, P1, P2, and P3 shown in fig. 10 may be increased while increasing the differences between P1 and P2, P2 and P3, and P3 and P4. And after the adjustment, sending the optical signal to the signal receiving end again, and waiting for returning the optical signal until the optical power of the returned optical signal and the optical power of the corresponding sent optical signal are in the same threshold interval. For example, when the transmitted optical signal is P1, the optical power value of the received return optical signal is less than d 1; when the transmitted optical signal is P2, the optical power value of the received return optical signal is greater than d1 and less than d 2; when the transmitted optical signal is P3, the optical power value of the received return optical signal is greater than d2 and less than d 3; when the transmitted optical signal is P4 and the optical power value of the received return optical signal is greater than d3, the amplitude modulation of the optical signal is completed.
In a possible scenario, if the optical power of the transmitted optical signal is adjusted for many times and normal communication cannot be achieved, the communication mechanism in the prior art can be returned to, and the communication rate is maintained as same as that in the prior art. Taking fig. 10 as an example, when the adjustment is not effective for a plurality of times, communication can be performed using only two optical signals of which the optical power values are P1 and P2. Before signal transmission, amplitude modulation communication needs to be carried out on two optical powers, namely P1 and P2, and only when the transmitted optical signal is P1, the optical power value of the received return optical signal is less than d 1; the transmitted optical signal is P2, and when the optical power value of the received return optical signal is greater than d1, the amplitude modulation of the optical signal is completed, so that the accuracy of the transmission signal is ensured.
The optical module provided by the embodiment of the invention comprises: a light emitting module; the light emitting module includes: the light emitter and the current control module connected with the light emitter, wherein the current control module at least comprises a first current switch circuit and a second current switch circuit; the first current switch circuit is used for outputting a first driving current to the light emitter; a second current switching circuit for outputting a second driving current to the light emitter; the optical transmitter is used for transmitting a first optical signal under the drive of a first drive current and transmitting a second optical signal under the drive of a second drive current; the optical power value of the first optical signal is used for indicating a first digital quantity, and the optical power value of the second optical signal is used for indicating a second digital quantity; the first drive current is less than the second drive current; the optical power value of the first optical signal is smaller than the optical power value of the second optical signal so that the first digital quantity is different from the second digital quantity. Because the current control module comprises at least two current switch circuits, and the output driving currents of the current switch circuits are not equal, the light power values of the light signals emitted by the light emitters driven by the output driving currents of the current switch circuits are not equal, therefore, the optical module provided by the embodiment of the invention can transmit at least three digital signals once, and the data transmission efficiency is improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A light module, comprising: a light emitting module; characterized in that the light emitting module comprises: the light emitter and the current control module connected with the light emitter, wherein the current control module at least comprises a first current switch circuit and a second current switch circuit; wherein,
the first current switch circuit is used for outputting a first driving current to the light emitter;
the second current switch circuit is used for outputting a second driving current to the light emitter;
the first current switch circuit and the second current switch circuit respectively output the first driving current or the second driving current to the light emitter at different time intervals;
the optical transmitter is used for transmitting a first optical signal under the driving of the first driving current and transmitting a second optical signal under the driving of the second driving current;
the optical power value of the first optical signal is used for indicating a first digital quantity, and the optical power value of the second optical signal is used for indicating a second digital quantity;
the first drive current is less than the second drive current; the optical power value of the first optical signal is less than the optical power value of the second optical signal to indicate that the first digital quantity is different from the second digital quantity.
2. The light module of claim 1, wherein the light emitting module further comprises: and the bias current generator is connected with the light emitter and used for providing bias current for the light emitter, and the bias current is used for driving the light emitter to work.
3. The optical module according to claim 1, wherein the current control module comprises 2N-1 current switch circuits, and each driving current outputted by each current switch circuit to the optical transmitter is not equal, where N is a positive integer greater than or equal to 2.
4. The light module of claim 1, further comprising: and the control module is used for controlling the communication of the first current switch circuit or the second current switch circuit according to a digital quantity in the transmitted digital signal so as to control the first driving current or the second driving current to be output to the light emitter according to the digital quantity.
5. The light module of any of claims 1-4, wherein the light emitter is a laser diode or a light emitting diode.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201202A (en) * | 2010-12-21 | 2011-09-28 | 友达光电股份有限公司 | Driving power supply control circuit and driving power supply control method of light emitting diode |
| CN104753599A (en) * | 2013-12-30 | 2015-07-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201202A (en) * | 2010-12-21 | 2011-09-28 | 友达光电股份有限公司 | Driving power supply control circuit and driving power supply control method of light emitting diode |
| CN104753599A (en) * | 2013-12-30 | 2015-07-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| CN108494492A (en) | 2018-09-04 |
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