CN112564810A - Set-top transmitter circuit and set-top signal transmission method - Google Patents
Set-top transmitter circuit and set-top signal transmission method Download PDFInfo
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- CN112564810A CN112564810A CN202011348398.XA CN202011348398A CN112564810A CN 112564810 A CN112564810 A CN 112564810A CN 202011348398 A CN202011348398 A CN 202011348398A CN 112564810 A CN112564810 A CN 112564810A
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
Abstract
The invention discloses a set-top transmitter circuit and a set-top signal transmission method, wherein the set-top transmitter circuit comprises a laser driving circuit and a power supply modulation circuit, the power supply modulation circuit is connected with the laser driving circuit, the output voltage of the power supply modulation circuit is the power supply voltage of the laser driving circuit, and the power supply modulation circuit can modulate a low-speed signal to the output voltage to realize the superposition of the low-speed signal to high-speed data in the laser driving circuit. The set-top transmitter circuit is simple and feasible, low-speed management data is modulated to high-speed data from the photoelectric transceiver level, so that set-top is realized, and by providing a set-top solution at the optical transceiver level, an optical module manufacturer can conveniently develop an optical module system, functions required by set-top of the transmitter are integrated, and the number of components required by the optical module system is reduced.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a set-top transmitter circuit and a set-top signal transmission method.
Background
Optical modules provide high-speed data communication functions as an important component of optical communication networks. With the rise of applications such as big data and 5G, the optical fiber resources are increasingly tense. Therefore, in a Wavelength Division Multiplexing (WDM) system (e.g. 5G forward, WDM-PON), it is desirable to establish a simple low-speed data transmission channel in addition to a high-speed data transmission channel for facilitating channel monitoring between optical modules. At present, channel monitoring mainly adopts a top-adjusting technology, wherein the top-adjusting technology is to superpose small-amplitude low-speed data signals on transmitted high-speed data signals, so that low-speed data signals containing channel information, signal quality and the like are used for managing channels and transmitting and receiving data. It is worth considering how to superimpose a low speed signal on a high speed data signal at the transmitting end.
Patent CN110190904A discloses a method and device for implementing optical modulation in a WDM PON system, which implement optical modulation at a transmitting end based on an optical amplifier SOA or EDFA, that is, a high-speed data optical signal output by an optical module is used as an input signal of the optical amplifier, and a control circuit is used to modulate the working current of the optical amplifier, thereby implementing the optical modulation. Patent CN111865409A discloses a method, a system and a microcontroller for transmitting a set-top signal based on a microcontroller, which realizes optical set-top based on the microcontroller, that is, the microcontroller in an optical module is used to control the current of a transmitting module of an optical transceiver to realize set-top.
The top-adjusting technology is realized at the level of an optical communication system or an optical module based on an optical amplifier or based on a microcontroller. Based on the optical amplifier mode, an additional optical amplifier SOA or EDFA is required, and a management control unit, a modulation unit and a coupling circuit matched with the additional optical amplifier SOA or EDFA are required. This approach increases the cost and system complexity of the optical communication system or optical module. The microcontroller-based mode has the problem that the communication of I2C collides with the tuning signal, namely when the optical module communicates with the host computer in I2C, if a data packet of the tuning signal arrives at the moment, the data packet of the tuning signal can be lost. Although patent 2 solves this problem, a higher performance microcontroller is required and the complexity of the control flow increases. In addition, the microcontroller-based set-top technique cannot transmit modulated signals in real time.
How to modulate a low-speed management signal onto a high-speed optical channel by a low-cost practical method, and the method is simple and convenient for an optical communication system or an optical module developer, which is an important technical problem to be solved urgently in the field.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a simple and feasible set-top transmitter circuit for modulating low-speed management data to high-speed data from an optoelectronic transceiver level. The technical scheme is as follows:
in order to solve the above problem, the present invention provides a set-top transmitter circuit, comprising: the laser driving circuit comprises a laser driving circuit and a power supply modulation circuit, wherein the power supply modulation circuit is connected with the laser driving circuit, the output voltage of the power supply modulation circuit is the power supply voltage of the laser driving circuit, and the power supply modulation circuit can modulate a low-speed signal to the output voltage to realize that the low-speed signal is superposed on high-speed data in the laser driving circuit.
As a further improvement of the present invention, the laser driving circuit includes a first-stage driving circuit and a second-stage driving circuit, the first-stage driving circuit and the second-stage driving circuit are in direct current coupling, the output voltage of the power source modulation circuit is the supply voltage of the first-stage driving circuit, when the supply voltage of the first-stage driving circuit changes, the output common-mode voltage of the first-stage driving circuit changes, and then the supply current of the second-stage driving circuit is changed, so as to superimpose a low-speed signal on high-speed data in the laser driving circuit.
As a further improvement of the present invention, the laser driving circuit drives a load laser diode that linearly converts an electrical signal output from the laser driver into an optical signal.
As a further improvement of the present invention, the power supply modulation circuit includes a reference voltage, an operational amplifier, a transistor, a resistor R1, and a resistor R2, a positive input terminal of the operational amplifier is connected to a reference voltage Vref, a first input terminal of the transistor is connected to a power supply Vcc, a second input terminal of the transistor is connected to an output terminal of the operational amplifier, an output terminal of the transistor generates an output voltage, a first terminal of a resistor R1 is connected to the output terminal of the transistor, a second terminal of a resistor R1 generates a feedback voltage and is connected to the input terminal of the operational amplifier, a first terminal of a resistor R2 is connected to the second terminal of a resistor R1, a second terminal of a resistor R2 is grounded, and a low-speed signal is applied to the positive input terminal or the negative input terminal of the operational amplifier.
As a further improvement of the present invention, by changing the amplitude of the input low-speed signal, the amplitude of the superimposed signal on the output voltage of the power supply modulation circuit can be changed, so as to change the modulation depth of the output waveform of the laser driving circuit, and further change the modulation depth of the output optical signal of the load laser diode.
As a further improvement of the invention, the loop bandwidth of a feedback loop formed by the reference voltage Vref, the operational amplifier, the transistor, the resistor R1 and the resistor R2 is controlled, so that the swing of the output waveform of the laser driving circuit is changed, and the intensity of the output optical signal of the load laser diode is further changed.
As a further improvement of the invention, the transistor is a MOS transistor or a BJT transistor.
The invention also discloses a transmission method of the set-top signal, which is applied to any of the set-top transmitter circuits and comprises the following steps:
the power supply modulation circuit modulates the low-speed signal to the output voltage to realize the superposition of the low-speed signal on the high-speed data in the laser driving circuit.
The invention has the beneficial effects that:
the circuit of the top-tuning transmitter has a simple structure, realizes the modulation of low-speed management data to high-speed data from the aspect of the photoelectric transceiver, thereby realizing the top-tuning, provides a top-tuning solution at the aspect of the optical transceiver, is convenient for optical module manufacturers to develop optical module systems, integrates functions required by the top-tuning of the transmitter, and reduces the number of components required by the optical module systems.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a set-top transmitter circuit in a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a laser driver circuit in a preferred embodiment of the invention;
FIG. 3 is a first schematic diagram of a power supply modulation circuit in a preferred embodiment of the invention;
FIG. 4 is a second schematic diagram of a power supply modulation circuit in a preferred embodiment of the present invention;
fig. 5 is a schematic illustration of the modulation bandwidth and modulation depth obtained in the preferred embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The set-top transmitter circuit in a preferred embodiment of the invention comprises: the laser driving circuit comprises a laser driving circuit and a power supply modulation circuit, wherein the power supply modulation circuit is connected with the laser driving circuit, the output voltage of the power supply modulation circuit is the power supply voltage of the laser driving circuit, and the power supply modulation circuit can modulate a low-speed signal to the output voltage to realize that the low-speed signal is superposed on high-speed data in the laser driving circuit.
As shown in fig. 1-2, optionally, the laser driving circuit includes a first Stage driving circuit Stage1 and a second Stage driving circuit Stage2, the first Stage driving circuit Stage1 and the second Stage driving circuit Stage2 are dc coupled, the output voltage Vout of the power supply modulation circuit is the supply voltage of the first Stage driving circuit Stage1, when the supply voltage of the first Stage driving circuit Stage1 changes, the output common mode voltage Vcm of the first Stage driving circuit Stage1 changes, and then the supply current of the second Stage driving circuit Stage2 is changed, so as to realize that a low-speed signal is superimposed on high-speed data in the laser driving circuit. The waveform of the low-speed signal is Wave1, the waveform of the high-speed data is Wave2, the waveform of the output voltage Vout is Wave3, and the waveform obtained after superposition at the output end of the second-Stage driving circuit Stage2 is Wave4, so that the vertex adjustment is realized.
Optionally, the laser driving circuit drives a load laser diode LD, and the load laser diode LD linearly converts an electrical signal output by the laser driver into an optical signal.
Optionally, the second Stage driving circuit Stage2 includes a gm transistor, and when the output common-mode voltage Vcm of the first Stage driving circuit Stage1 changes, the current of the gm transistor changes along with the change.
As shown in fig. 3 to 4, in some embodiments, the power supply modulation circuit includes a reference voltage Vref, an operational amplifier OPAMP having a positive input terminal connected to the reference voltage Vref, a transistor translator having a first input terminal connected to the power supply Vcc, a second input terminal connected to an output terminal of the operational amplifier OPAMP, a resistor R1, and a resistor R2, the output terminal OPAMP of the transistor translator generating the output voltage Vout, a first terminal of the resistor R1 connected to the output terminal of the operational amplifier OPAMP, a second terminal of the resistor R1 generating the feedback voltage and connected to the negative input terminal of the operational amplifier OPAMP, a first terminal of the resistor R2 connected to the second terminal of the resistor R1, a second terminal of the resistor R2 connected to ground, a low-speed signal applied to the positive input terminal or the negative input terminal of the operational amplifier OPAMP, fig. 3 corresponds to the low-speed signal applied to the negative input terminal of the operational amplifier OPAMP, fig. 4 corresponds to a low speed signal applied to the positive input terminal of the operational amplifier OPAMP.
The operational amplifier OPAMP outputs a voltage Vmod by comparing a reference voltage Vref with a voltage division feedback of the resistor R1 and the resistor R2, and the output voltage Vout is adjusted by the output voltage Vmod.
As shown in fig. 5, by changing the amplitude of the input low-speed signal, the amplitude of the superimposed signal on the output voltage of the power supply modulation circuit can be changed, so as to change the modulation depth of the output waveform of the laser driving circuit, and further change the modulation depth of the output optical signal of the load laser diode LD. The loop bandwidth of a feedback loop is formed by controlling the reference voltage Vref, the operational amplifier, the transistor, the resistor R1 and the resistor R2, so that the swing amplitude of the output waveform of the laser driving circuit is changed, the intensity of an output optical signal of the loaded laser diode LD is further changed, and referring to the additive Date bandwidth in the figure, the rate required by a protocol can be met, and meanwhile, the influence of noise on high-speed data is reduced by optimizing the power supply modulation bandwidth. The modulation bandwidth and the modulation depth are adjustable.
Optionally, the transistor is a MOS transistor or a BJT transistor, etc.
The preferred embodiment of the present invention also discloses a method for transmitting a set-top signal, which is applied to the set-top transmitter circuit in the above embodiment, and comprises the following steps:
the power supply modulation circuit modulates the low-speed signal to the output voltage to realize the superposition of the low-speed signal on the high-speed data in the laser driving circuit.
The circuit of the top-tuning transmitter has a simple structure, realizes the modulation of low-speed management data to high-speed data from the aspect of the photoelectric transceiver, thereby realizing the top-tuning, provides a top-tuning solution at the aspect of the optical transceiver, is convenient for optical module manufacturers to develop optical module systems, integrates functions required by the top-tuning of the transmitter, and reduces the number of components required by the optical module systems.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. A set top transmitter circuit, comprising: the laser driving circuit comprises a laser driving circuit and a power supply modulation circuit, wherein the power supply modulation circuit is connected with the laser driving circuit, the output voltage of the power supply modulation circuit is the power supply voltage of the laser driving circuit, and the power supply modulation circuit can modulate a low-speed signal to the output voltage to realize that the low-speed signal is superposed on high-speed data in the laser driving circuit.
2. The set-top transmitter circuit as claimed in claim 1, wherein the laser driver circuit comprises a first stage driver circuit and a second stage driver circuit, the first stage driver circuit and the second stage driver circuit are dc-coupled, the output voltage of the power modulator circuit is the supply voltage of the first stage driver circuit, and when the supply voltage of the first stage driver circuit changes, the output common-mode voltage of the first stage driver circuit changes, and thus the supply current of the second stage driver circuit changes, so as to superimpose a low-speed signal on high-speed data in the laser driver circuit.
3. The set top transmitter circuit of claim 2 wherein said laser driver circuit drives a load laser diode that linearly converts an electrical signal output by said load laser driver into an optical signal.
4. The set-top transmitter circuit of claim 3 wherein the power supply modulation circuit comprises a reference voltage Vref, an operational amplifier, a transistor, a resistor R1, and a resistor R2, wherein a positive input of the operational amplifier is coupled to the reference voltage Vref, a first input of the transistor is coupled to the power supply Vcc, a second input of the transistor is coupled to an output of the operational amplifier, an output of the transistor generates an output voltage, a first terminal of a resistor R1 is coupled to an output of the transistor, a second terminal of a resistor R1 generates a feedback voltage and is coupled to a negative input of the operational amplifier, a first terminal of a resistor R2 is coupled to a second terminal of a resistor R1, a second terminal of a resistor R2 is coupled to ground, and a low speed signal is applied to either the positive input or the negative input of the operational amplifier.
5. The set top transmitter circuit of claim 4 wherein the amplitude of the superimposed signal on the output voltage from said power supply modulation circuit is varied by varying the amplitude of the incoming low speed signal to vary the modulation depth of the output waveform from said laser driver circuit and hence the modulation depth of the output optical signal from said loaded laser diode.
6. The set top transmitter circuit of claim 4 wherein the loop bandwidth of the feedback loop formed by the reference voltage Vref, the operational amplifier, the transistor, the resistor R1 and the resistor R2 is controlled to vary the swing of the output waveform of the laser driver circuit and thereby vary the intensity of the output optical signal of the loaded laser diode.
7. The set top transmitter circuit of claim 4, wherein the transistor is a MOS transistor or a BJT transistor.
8. A method for transmitting a set-top signal, applied to the set-top transmitter circuit of any one of claims 1 to 7, comprising:
the power supply modulation circuit modulates the low-speed signal to the output voltage to realize the superposition of the low-speed signal on the high-speed data in the laser driving circuit.
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| CN202011348398.XA CN112564810B (en) | 2020-11-26 | 2020-11-26 | Set-top transmitter circuit and set-top signal transmission method |
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| CN202011348398.XA CN112564810B (en) | 2020-11-26 | 2020-11-26 | Set-top transmitter circuit and set-top signal transmission method |
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Cited By (2)
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| CN113300776A (en) * | 2021-04-30 | 2021-08-24 | 武汉联特科技股份有限公司 | Circuit and method for improving top-adjusting sensitivity |
| CN113472446A (en) * | 2021-07-08 | 2021-10-01 | 武汉华工正源光子技术有限公司 | Medium wavelength division optical module with operation maintenance management function |
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| CN112564810B (en) | 2022-04-19 |
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