CN114039669A - Light roof device - Google Patents
Light roof device Download PDFInfo
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- CN114039669A CN114039669A CN202111302952.5A CN202111302952A CN114039669A CN 114039669 A CN114039669 A CN 114039669A CN 202111302952 A CN202111302952 A CN 202111302952A CN 114039669 A CN114039669 A CN 114039669A
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
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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
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
Abstract
The invention discloses a light modulation device, comprising: the optical fiber laser comprises a laser, an optical topping circuit, a Mach-Zehnder modulator and a Mach-Zehnder driver; the optical modulation and demodulation circuit receives an externally input modulation signal and performs pulse width modulation to obtain an optical modulation and demodulation signal driving current; the laser outputs a light beam with the optical pilot tone top signal according to the optical pilot tone top signal driving current and the driving current; the Mach-Zehnder modulator modulates the light beam with the optical topping signal according to the voltage modulation signal of the Mach-Zehnder driver to obtain a main signal with the optical topping signal. By implementing the invention, the modulation signal is subjected to pulse width modulation by adopting the optical modulation and demodulation circuit to obtain the optical modulation and demodulation signal driving current, so that the controllable linear output modulation of the optical modulation and demodulation signal is realized; meanwhile, the Mach-Zehnder modulator can directly modulate the light beam with the optical tuning top signal according to the voltage modulation signal, and stable output of the main signal is realized.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical top modulation device.
Background
With the coming of the 5G era, each large operator is preoccupied with the market, the construction of the 5G network is greatly promoted, and various networking modes for 5G forward are continuously optimized and evolved. Based on the consideration of cost and optical fiber resources, the 5G forwarding scheme evolves from the traditional optical fiber direct drive scheme to the wavelength division multiplexing scheme. The wavelength division multiplexing scheme can be divided into 3 schemes of passive wavelength division, semi-active wavelength division and active wavelength division. In the 3 schemes, the cost of passive wavelength division is the lowest, the application deployment is the fastest, but in the deployment process, the passive wavelength division cannot be effectively monitored, and the defect of poor maintainability is gradually exposed. In order to solve this problem, a semi-active Wavelength Division scheme is gaining attention, and among the many semi-active Wavelength Division schemes, a semi-active system based on a Medium Wavelength Division Multiplexing (MWDM) function and a local area network Wavelength Division Multiplexing (LAN Wavelength Division Multiplexing, LANWDM) function is most concerned.
In the application of WDM technology, channel monitoring is an important technology that optical modules must possess. The channel monitoring mainly adopts the optical top modulation technology, which means that a low-frequency signal modulation with small amplitude is superposed on a signal at the end of an optical transmitter to be used as an identifier, different channels adopt different identification information, and a receiving end can correspondingly acquire information such as wavelength and the like by detecting the identification information so as to realize the function of channel monitoring. For example, in the wavelength division multiplexing wireless forwarding application, in addition to the main service data of 25Gbps, a simple low-speed "message channel" is desired to transmit the monitoring information on both sides of the channel, such as the monitoring amount query of the optical module, the negotiation of both wavelengths, the loop back test of the link, and so on.
Currently, there are two ways for optical transmission to transmit signals, including inner modulation and outer modulation. However, the current inner modulation scheme and the current outer modulation scheme both face the problem of higher cost, and limit the application of channel monitoring in semi-active technology.
Disclosure of Invention
In view of this, embodiments of the present invention provide a light modulation and demodulation apparatus, so as to solve the technical problem in the prior art that a channel monitoring scheme in a semi-active technology has a high cost.
The technical scheme provided by the invention is as follows:
a first aspect of an embodiment of the present invention provides an optical modulation apparatus, including: the optical fiber laser comprises a laser, an optical topping circuit, a Mach-Zehnder modulator and a Mach-Zehnder driver; the optical modulation and demodulation circuit receives an externally input modulation signal, performs pulse width modulation on the modulation signal to obtain an optical modulation and demodulation signal driving current, and inputs the optical modulation and demodulation signal driving current to the laser; the laser outputs a light beam with a light modulation top signal according to the light modulation top signal driving current and the laser driving current; and the Mach-Zehnder modulator modulates the light beam with the optical vertex signal according to the voltage modulation signal of the Mach-Zehnder driver to obtain a main signal with the optical vertex signal.
Optionally, the light top-adjusting device further comprises: the micro control unit receives and decodes an externally input optical pilot tone signal to obtain a modulation signal, and inputs the modulation signal to the optical pilot tone circuit; the micro control unit is also used for inputting a voltage adjusting signal to the Mach-Zehnder driver, the Mach-Zehnder driver carries out voltage swing amplitude adjustment according to the voltage adjusting signal to obtain a voltage modulating signal, and the voltage modulating signal is input to the Mach-Zehnder modulator; the light modulation and demodulation circuit comprises a low dropout linear voltage regulator, a DC-DC circuit or a bias current circuit, wherein the low dropout linear voltage regulator is provided with a pulse width modulation pin.
Optionally, when the light beam with the optical vertex signal is input to the mach-zehnder modulator, the micro control unit inputs a step-down adjustment signal to the mach-zehnder driver, the mach-zehnder driver reduces a voltage swing according to the step-down adjustment signal to obtain a step-down modulation signal, and the step-down modulation signal is input to the mach-zehnder modulator.
Optionally, the light top-adjusting device further comprises: and the micro control unit is also used for acquiring the resistance value of the thermistor and adjusting the magnitude of the modulation signal and the voltage adjusting signal according to the resistance value.
Optionally, the micro control unit adjusts the magnitude of the modulation signal and the voltage adjustment signal according to the resistance value, and includes: the micro control unit compares the resistance value with a first preset threshold value, when the temperature corresponding to the resistance value is lower than the first preset threshold value, the micro control unit increases the driving current of the laser, the micro control unit inputs a low-temperature modulation signal to the low-pressure-difference linear voltage stabilizer, the low-pressure-difference linear voltage stabilizer outputs a light-modulation-signal low-temperature driving current according to the low-temperature modulation signal, and the light-modulation-signal low-temperature driving current is larger than the light-modulation-signal driving current; and the micro control unit is also used for inputting a voltage reduction adjusting signal to the Mach-Zehnder driver when the temperature corresponding to the resistance value is lower than a first preset threshold value, the Mach-Zehnder driver reduces the voltage swing according to the voltage reduction adjusting signal to obtain a voltage reduction modulating signal, and the voltage reduction modulating signal is input to the Mach-Zehnder modulator.
Optionally, the micro control unit adjusts the magnitude of the modulation signal and the magnitude of the voltage adjustment signal according to the resistance value, and further includes: the micro control unit compares the temperature corresponding to the resistance value with a second preset threshold value, when the temperature corresponding to the resistance value is larger than the second preset threshold value, the micro control unit controls the driving current of the laser to be reduced, the micro control unit inputs a high-temperature modulation signal to the low-dropout linear voltage regulator, the low-dropout linear voltage regulator outputs a light modulation signal high-temperature driving current according to the high-temperature modulation signal, and the light modulation signal high-temperature driving current is smaller than the light modulation signal driving current; and the micro control unit is also used for inputting a boosting adjustment signal to the Mach-Zehnder driver when the temperature corresponding to the resistance value is greater than a second preset threshold value, the Mach-Zehnder driver increases the voltage swing according to the boosting adjustment signal to obtain a boosting modulation signal, and the boosting modulation signal is input to the Mach-Zehnder modulator.
Optionally, the light top-adjusting device further comprises: the first monitoring detector is used for monitoring the light intensity value of the output light beam of the laser, the light intensity value is input into the micro control unit, the micro control unit compares the light intensity value with a first storage value, and when the light intensity value is lower than the first storage value, a first replacing signal is generated.
Optionally, the light top-adjusting device further comprises: and the second monitoring detector is used for monitoring the light intensity value of the output light beam of the Mach-Zehnder modulator, inputting the light intensity value into the micro control unit, comparing the light intensity value with a second stored value by the micro control unit, and generating a second replacement signal when the light intensity value is lower than the second stored value.
Optionally, the light top-adjusting device further comprises: and the micro control unit receives an externally input light modulation and demodulation signal through the general input and output interface.
Optionally, the light top-adjusting device further comprises: the universal input/output interface, the micro control unit, the Mach-Zehnder driver, the thermistor and the low-dropout linear regulator are all arranged on the PCB.
The technical scheme provided by the invention has the following effects:
the optical topping device provided by the embodiment of the invention is provided with the optical topping circuit, the Mach-Zehnder modulator and the Mach-Zehnder driver, wherein the optical topping circuit obtains the optical topping signal driving current by performing pulse width modulation on the modulation signal, so that the controllable linear modulation output of the optical topping signal can be realized by the pulse width modulation; meanwhile, the Mach-Zehnder modulator can directly modulate the light beam with the optical topping signal according to the voltage modulation signal of the Mach-Zehnder driver, and stable output modulation of the main signal is achieved.
According to the optical vertex-adjusting device provided by the embodiment of the invention, the laser, the Mach-Zehnder modulator, the first monitoring detector, the second monitoring detector and other elements are adopted, when an optical vertex-adjusting signal is input from the outside, the Mach-Zehnder driver can generate a voltage modulation signal according to a voltage adjustment signal of the micro control unit, so that the Mach-Zehnder modulator is controlled to adjust a '0' signal in an optical signal output by the laser, the extinction ratio of a main signal is improved, and the stable output of a high-frequency main signal is realized; meanwhile, the optical pilot tone top signal can be linearly output and modulated by adopting the optical pilot tone top circuit. In addition, aiming at different temperature scenes, the optical pilot signals and the main signals are dynamically adjusted through the optical pilot circuit and the Mach-Zehnder driver, so that the overall power consumption can be balanced, and the service lives of the laser and the detector at the receiving end can be better protected. And set up first monitoring detector and second monitoring detector and carry out the light path monitoring, can maintain the device life-span dynamically, control optical path system, reduce the fortune and maintain the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of an optical top-hat device according to an embodiment of the present invention;
fig. 2 is a block diagram of a light top-modulation device according to another embodiment of the invention.
Detailed Description
As described in the background, both the inner modulation scheme and the outer modulation scheme face a problem of high cost. Wherein, the internal modulation is to combine the laser light source and the modulator into one; the external modulation is realized by coupling a laser with an external modulator and the like.
In the internal modulation scheme, a semiconductor laser is generally adopted, and the output rate of the semiconductor laser is inversely proportional to the length of a vibration cavity; if a higher frequency is used, the optical power output is difficult to increase further. Generally, 1-3% of optical modulation amplitude is adopted, and when 3% of modulation amplitude is adopted, the pressure on a transmitting end is huge, the quality of an optical eye diagram of the transmitting end of a color optical module is deteriorated, for example, the margin of an optical eye diagram template is deteriorated, and jitter is increased, and meanwhile, when the mixed signal is transmitted to the receiving end of an optical module at the opposite end, the signal-to-noise ratio of the whole optical fiber link is reduced, the sensitivity of a main service is deteriorated, and the normal operation of the 25G main service is interfered; if 1% amplitude modulation is adopted, the transmitting end has no pressure, but the receiving end is forced to shorten the communication distance of OAM due to too small amplitude modulation, which is not in accordance with the requirement of economy. Furthermore, for indium phosphide materials in DML lasers, the production limit has been quickly approached; if the optical power amplitude is increased by 1% -3%, the internal reliability standard is broken through, and delivery and reliability face double risks.
The existing external modulation optical module generally adopts the following scheme: two groups of Mach-Zehnder modulators are adopted, one group of modulators is used for intensity modulation of main signals, and the other group of modulators is used for low-frequency OAM signal modulation. Two pairs of waveguide type modulation arms are needed in the optical path part, three times of light splitting and light combining are needed, and loss of an optical link is huge. Further, modulation mainly modulates 0 of the NRZ signal in the main signal, and there is a problem of nonlinear modulation (modulating the main signal 1 affects the eye quality of the main signal). Meanwhile, the debugging workload of personnel is large, and the effect is not good. In addition, two paths of Mach-Zehnder drivers are needed, and the cost is high.
In view of the above, an embodiment of the present invention provides a light modulation apparatus, including: the optical fiber laser comprises a laser, an optical topping circuit, a Mach-Zehnder modulator and a Mach-Zehnder driver; the optical modulation and demodulation circuit receives an externally input modulation signal, performs pulse width modulation on the modulation signal to obtain an optical modulation and demodulation signal driving current, and inputs the optical modulation and demodulation signal driving current to the laser; the laser outputs a light beam with a light modulation top signal according to the light modulation top signal driving current and the laser driving current; and the Mach-Zehnder modulator modulates the light beam with the optical vertex signal according to the voltage modulation signal of the Mach-Zehnder driver to obtain a main signal with the optical vertex signal.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a light modulation apparatus, as shown in fig. 1, the light modulation apparatus includes: a laser 10, an optical tap circuit 20, a mach-zehnder modulator 30, and a mach-zehnder driver 40; the optical modulation and demodulation circuit receives an externally input modulation signal, performs pulse width modulation on the modulation signal to obtain an optical modulation and demodulation signal driving current, and inputs the optical modulation and demodulation signal driving current to the laser 10; the laser 10 outputs a light beam with a light pilot tone signal according to the light pilot tone signal driving current and the laser 10 driving current; the mach-zehnder modulator 30 modulates the light beam with the optical add-drop signal according to the voltage modulation signal of the mach-zehnder driver 40 to obtain a main signal with the optical add-drop signal.
In one embodiment, the laser 10 may be a continuous wavelength laser 10, the modulation signal may be Manchester encoded, and the optical top circuit may include a low dropout linear regulator 21, a DC-DC circuit, or a bias current circuit; in addition, the optical modulation and demodulation circuit can also adopt other hardware structures as long as the function of the optical modulation and demodulation circuit can be realized. If the low dropout regulator 21 is adopted, in order to implement the pulse width modulation function, a pulse width modulation pin is provided on the low dropout regulator 21, and the modulation signal can be directly input to the pulse width modulation pin to generate the pilot tone modulation signal driving current. Meanwhile, the mach-zehnder driver 40 may also receive an externally input main signal transmission signal, and generate a voltage modulation signal according to the main signal transmission signal.
Specifically, the mach-zehnder modulator 30 has two interference arms, and can divide an input light beam into two equal paths of signals to enter the two interference arms, respectively, where the two interference arms are made of electro-optical material and the refractive index of the two interference arms changes with the magnitude of an externally applied electrical signal. Because the refractive index change of the optical branch can cause the change of the signal phase, when the output ends of the two branch signal modulators are combined together again, the synthesized optical signal is an interference signal with the intensity change, which is equivalent to converting the change of the electrical signal into the change of the optical signal, and the modulation of the optical intensity is realized.
In addition, the optical add/drop device employs a single mach-zehnder modulator 30, which can directly modulate the optical beam with the optical add/drop signal according to the voltage modulation signal of the mach-zehnder driver 40, and specifically can modulate the main signal in the optical beam with the optical add/drop signal, so that the main signal output by the mach-zehnder modulator 30 is stably output. Meanwhile, the drive current of the optical pilot tone is subjected to pulse width modulation by the optical pilot tone circuit, so that controllable linear output modulation of the optical pilot tone can be realized.
The optical topping device provided by the embodiment of the invention is provided with the optical topping circuit, the Mach-Zehnder modulator 30 and the Mach-Zehnder driver 40, wherein the optical topping circuit obtains the optical topping signal driving current by performing pulse width modulation on a modulation signal, so that the controllable linear output modulation of the optical topping signal can be realized through the pulse width modulation; meanwhile, the mach-zehnder modulator 30 can directly modulate the light beam with the optical topping signal according to the voltage modulation signal of the mach-zehnder driver 40, thereby realizing stable output modulation of the main signal.
The following embodiments will describe the structure of the optical top-hat device in detail by taking an example in which the optical top-hat circuit employs the low dropout regulator 21.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the optical top modulation device further includes: the micro control unit 50 receives an externally input optical pilot-tone signal for decoding to obtain a modulation signal, and inputs the modulation signal to the low dropout linear regulator 21; the micro control unit 50 is further configured to input a voltage adjustment signal to the mach-zehnder driver 40, and the mach-zehnder driver 40 performs voltage swing adjustment according to the voltage adjustment signal to obtain a voltage modulation signal, and inputs the voltage modulation signal to the mach-zehnder modulator 30. Specifically, a general purpose input/output interface 90 may be further provided in the optical adjusting apparatus, and the micro control unit 50 acquires an optical modulation and demodulation signal (OAM signal) input from the outside through the general purpose input/output interface 90.
In one embodiment, when the light beam with the optical add-drop signal is input to the mach-zehnder modulator 30, or after the micro control unit 50 inputs the modulation signal to the low-dropout linear regulator 21, the micro control unit 50 inputs a step-down adjustment signal to the mach-zehnder driver 40, and the mach-zehnder driver 40 reduces the voltage swing according to the step-down adjustment signal to obtain a step-down modulation signal, and inputs the step-down modulation signal to the mach-zehnder modulator 30.
Specifically, when the laser 10 receives the optical pilot signal driving current, an optical pilot signal is superimposed on the output beam, and the quality of the main signal may be degraded due to the superimposed optical pilot signal in the final output optical signal. Thus, the micro control unit 50 can input the step-down adjustment signal to the mach-zehnder driver 40 to reduce the voltage swing of the mach-zehnder driver 40, and the optical signal output by the laser 10 includes the "0" signal and the "1" signal to reduce the mach-zehnder drive swing, so that the output light intensity of the "0" signal in the optical beam output by the mach-zehnder modulator 30 can be increased, and the quality of the main signal can be ensured.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the optical top modulation device further includes: the thermistor 60, and the micro control unit 50 is further configured to obtain a resistance value of the thermistor 60, and adjust the magnitude of the modulation signal and the magnitude of the voltage adjustment signal according to the resistance value. Specifically, both the laser 10 and the detector receiving the output beam of the mach-zehnder modulator 30 require appropriate operating temperatures. Wherein, the laser 10 at the emitting end needs a proper working temperature; the detector at the receiving end needs better heat dissipation conditions, and has higher sensitivity and response time in a low-temperature environment. Thus, by providing the thermistor 60, the micro control unit 50 can detect the ambient temperature change by the resistance value change of the thermistor 60, so that the laser 10 and the detector are in a better operating state by modulating the laser 10 and the mach-zehnder modulator 30.
In one embodiment, the micro control unit 50 adjusts the magnitude of the modulation signal and the voltage adjustment signal according to the resistance value, including: the micro control unit 50 compares the temperature corresponding to the resistance value with a first preset threshold value, when the temperature corresponding to the resistance value is lower than the first preset threshold value, the micro control unit 50 increases the driving current of the laser 10, the micro control unit 50 inputs a low-temperature modulation signal to the low-pressure-difference linear voltage stabilizer 21, the low-pressure-difference linear voltage stabilizer 21 outputs a light-modulation-signal low-temperature driving current according to the low-temperature modulation signal, and the light-modulation-signal low-temperature driving current is greater than the light-modulation-signal driving current; the micro control unit 50 is further configured to input a step-down adjustment signal to the mach-zehnder driver 40 when the temperature corresponding to the resistance value is lower than a first preset threshold value, and the mach-zehnder driver 40 reduces the voltage swing according to the step-down adjustment signal to obtain a step-down modulation signal, and inputs the step-down modulation signal to the mach-zehnder modulator 30.
Specifically, the temperature corresponding to the resistance value of the thermistor 60 can be determined by a temperature table of the thermistor. And compares the temperature with a first preset threshold. The first predetermined threshold may be thirty degrees below zero, or the first predetermined threshold may be determined based on the specific operating parameters of the laser 10 and the detector. The micro control unit 50 can obtain the resistance value of the thermistor 60 through the general input output interface 90. When the light modulation top-hat signal is smaller than the first preset threshold, the light modulation top-hat device is in a low-temperature state, and in order to enable the laser 10 to be in a better working temperature region, the driving current value of the laser 10 can be increased, and meanwhile, the light modulation top-hat signal driving current is increased. The driving current value of the laser 10 can be increased by 1% to 2%, and the light pilot signal driving current can be increased by 2% to 5%, for example, the light pilot signal driving current can be increased by 2%, 3%, 4% or 5%, and preferably can be 4% or 5%. Meanwhile, a step-down adjustment signal may be input to the mach-zehnder driver 40, so that the output light intensity of the "0" signal in the output light beam of the mach-zehnder modulator 30 may be increased, and the extinction ratio parameter of the main signal may be reduced, where the extinction ratio refers to the ratio of the optical power P1 when the laser 10 emits all "1" codes to the optical power P0 when all "0" codes are emitted; this not only balances the overall power consumption, but also better protects the laser 10 and the detector life at the receiving end.
In one embodiment, the micro control unit 50 adjusts the magnitude of the modulation signal and the voltage adjustment signal according to the resistance value, and further includes: the micro control unit 50 compares the temperature corresponding to the resistance value with a second preset threshold value, when the temperature corresponding to the resistance value is greater than the second preset threshold value, the micro control unit 50 controls the driving current of the laser 10 to be reduced, the micro control unit 50 inputs a high-temperature modulation signal to the low-dropout linear regulator 21, the low-dropout linear regulator 21 outputs a high-temperature light pilot signal driving current according to the high-temperature modulation signal, and the high-temperature light pilot signal driving current is smaller than the light pilot signal driving current; the micro control unit 50 is further configured to input a boost adjustment signal to the mach-zehnder driver 40 when the temperature corresponding to the resistance value is higher than a second preset threshold value, where the mach-zehnder driver 40 increases the voltage swing according to the boost adjustment signal to obtain a boost modulation signal, and input the boost modulation signal to the mach-zehnder modulator 30.
In particular, the second predetermined threshold may be thirty degrees above zero, or the second predetermined threshold may be determined according to specific operating parameters of the laser 10 and the detector. The micro control unit 50 can obtain the resistance value of the thermistor 60 through the general input output interface 90. When the light modulation and demodulation signal is greater than the second preset threshold, the light modulation and demodulation device is in a high-temperature state, and in order to enable the laser 10 to be in a better working temperature region, the driving current value of the laser 10 can be reduced, and meanwhile, the light modulation and demodulation signal driving current is reduced. The optical pilot tone driving current may be increased by 2% to 3%, for example, the optical pilot tone driving current may be increased by 2%, 3%, and preferably may be increased by 2%. Meanwhile, a boost adjustment signal can be input to the mach-zehnder driver 40, and the driving voltage of the mach-zehnder driver 40 is increased, so that the output light intensity of the "0" signal in the output light beam of the mach-zehnder modulator 30 is reduced, and the extinction ratio parameter of the main signal is obtained; this not only balances the overall power consumption, but also better protects the laser 10 and the detector life at the receiving end.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the optical top modulation device further includes: a first monitoring detector 70, said first monitoring detector 70 being adapted to monitor a light intensity value of the output beam of said laser 10, to input said light intensity value to said micro control unit 50, said micro control unit 50 comparing said light intensity value with a first stored value, and to generate a first replacement signal when said light intensity value is lower than said first stored value. The micro control unit 50 may obtain the light intensity value of the first monitoring detector 70 through the general input/output interface 90 during idle time, the first stored value is pre-stored in a register of the micro control unit 50, when the light intensity value is compared with the first stored value, it may be determined first how much the light intensity value is lower than the first preset value, if the light intensity value is lower than 8%, the micro control unit 50 sends an alarm instruction to the OAM monitoring system to prompt a risk; if the current value is lower than 15%, the micro control unit 50 outputs a first replacement signal, and meanwhile, the OAM monitoring screen is marked with red to notify replacement. When the first replacement signal is received, the loss value of the laser 10 is large, and the laser needs to be replaced. Meanwhile, the first replacing signal can also be fed back to an operation and maintenance department so as to replace the component in time.
In one embodiment, as shown in fig. 2, the light top-hat device includes: a second monitoring detector 80, wherein the second monitoring detector 80 is configured to monitor a light intensity value of the output light beam of the mach-zehnder modulator 30, input the light intensity value to the micro control unit 50, and the micro control unit 50 compares the light intensity value with a second stored value, and generates a second replacement signal when the light intensity value is lower than the second stored value. The micro control unit 50 may obtain the light intensity value of the second monitoring detector 80 through the general input/output interface 90 during idle time, the second stored value is pre-stored in a register of the micro control unit 50, when the light intensity value is compared with the second stored value, it may be determined first how much the light intensity value is lower than the second preset value, and if the light intensity value is lower than 8%, the micro control unit 50 sends an alarm instruction to the OAM monitoring system to prompt a risk; if the current value is lower than 15%, the micro control unit 50 outputs a second replacement signal, and meanwhile, the OAM monitoring screen is marked with red to notify replacement. When the second replacement signal is received, it indicates that the loss value of the laser 10 is large, or the mach-zehnder driver is grayed out or has a failure, and the laser and the mach-zehnder driver need to be replaced. Meanwhile, the second replacing signal can also be fed back to an operation and maintenance department so as to replace the component in time.
In one embodiment, the light modulation device further comprises: the universal input/output interface 90, the micro control unit 50, the mach-zehnder driver 40, the thermistor 60 and the low-dropout regulator 21 are all arranged on the PCB. The laser 10 and the mach-zehnder modulator 30 may be connected to a PCB board by flying wires, the first monitoring detector 70 may be disposed in a hermetic package together with the laser 10, the second monitoring detector 80 is disposed at one side of the optical combiner of the mach-zehnder modulator 30, and both the second monitoring detector 80 and the mach-zehnder modulator 30 are designed in the same chip.
According to the optical vertex-modulated device provided by the embodiment of the invention, the laser 10, the Mach-Zehnder modulator 30, the first monitoring detector 70, the second monitoring detector 80 and other elements are adopted, when an optical vertex-modulated signal is input from the outside, the Mach-Zehnder driver can generate a voltage modulation signal according to a voltage adjustment signal of the micro control unit, so that the Mach-Zehnder modulator is controlled to adjust a '0' signal in an optical signal output by the laser, the extinction ratio of a main signal is improved, and stable output of a high-frequency main signal is realized; meanwhile, the optical pilot tone top signal can be subjected to controllable linear output modulation by adopting the optical pilot tone top circuit. In addition, aiming at different temperature scenes, the optical pilot signals and the main signals are dynamically adjusted through the optical pilot circuit and the Mach-Zehnder driver, so that the overall power consumption can be balanced, and the service lives of the laser and the detector at the receiving end can be better protected. And set up first monitoring detector and second monitoring detector and carry out the light path monitoring, can maintain the device life-span dynamically, control optical path system, reduce the fortune and maintain the cost.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit and scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (10)
1. A light ceiling device, comprising: the optical fiber laser comprises a laser, an optical topping circuit, a Mach-Zehnder modulator and a Mach-Zehnder driver;
the optical modulation and demodulation circuit receives an externally input modulation signal, performs pulse width modulation on the modulation signal to obtain an optical modulation and demodulation signal driving current, and inputs the optical modulation and demodulation signal driving current to the laser;
the laser outputs a light beam with a light modulation top signal according to the light modulation top signal driving current and the laser driving current;
and the Mach-Zehnder modulator modulates the light beam with the optical vertex signal according to the voltage modulation signal of the Mach-Zehnder driver to obtain a main signal with the optical vertex signal.
2. The light ceiling device according to claim 1, further comprising: a micro-control unit for controlling the operation of the micro-control unit,
the micro control unit receives an externally input light modulation and demodulation signal to decode to obtain a modulation signal, and the modulation signal is input to the light modulation and demodulation circuit;
the micro control unit is also used for inputting a voltage adjusting signal to the Mach-Zehnder driver, the Mach-Zehnder driver carries out voltage swing amplitude adjustment according to the voltage adjusting signal to obtain a voltage modulating signal, and the voltage modulating signal is input to the Mach-Zehnder modulator;
the light modulation and demodulation circuit comprises a low dropout linear voltage regulator, a DC-DC circuit or a bias current circuit, wherein the low dropout linear voltage regulator is provided with a pulse width modulation pin.
3. The light ceiling device according to claim 2,
when the light beam with the optical topping signal is input to the Mach-Zehnder modulator, the micro control unit inputs a step-down adjusting signal to the Mach-Zehnder driver, the Mach-Zehnder driver reduces the voltage swing according to the step-down adjusting signal to obtain a step-down modulating signal, and the step-down modulating signal is input to the Mach-Zehnder modulator.
4. The light ceiling device according to claim 2, further comprising: a thermal resistor is arranged on the outer side of the shell,
the micro control unit is also used for acquiring the resistance value of the thermistor and adjusting the magnitude of the modulation signal and the voltage adjusting signal according to the resistance value.
5. The optical top-hat device according to claim 4, wherein the micro control unit adjusts the magnitude of the modulating signal and the voltage adjusting signal according to the resistance value, comprising:
the micro control unit compares the resistance value with a first preset threshold value, when the temperature corresponding to the resistance value is lower than the first preset threshold value, the micro control unit increases the driving current of the laser, the micro control unit inputs a low-temperature modulation signal to the low-pressure-difference linear voltage stabilizer, the low-pressure-difference linear voltage stabilizer outputs a light-modulation-signal low-temperature driving current according to the low-temperature modulation signal, and the light-modulation-signal low-temperature driving current is larger than the light-modulation-signal driving current;
and the micro control unit is also used for inputting a voltage reduction adjusting signal to the Mach-Zehnder driver when the temperature corresponding to the resistance value is lower than a first preset threshold value, the Mach-Zehnder driver reduces the voltage swing according to the voltage reduction adjusting signal to obtain a voltage reduction modulating signal, and the voltage reduction modulating signal is input to the Mach-Zehnder modulator.
6. The optical top-hat device according to claim 4, wherein the micro control unit adjusts the magnitude of the modulating signal and the voltage adjusting signal according to the resistance value, further comprising:
the micro control unit compares the temperature corresponding to the resistance value with a second preset threshold value, when the temperature corresponding to the resistance value is larger than the second preset threshold value, the micro control unit controls the driving current of the laser to be reduced, the micro control unit inputs a high-temperature modulation signal to the low-dropout linear voltage regulator, the low-dropout linear voltage regulator outputs a light modulation signal high-temperature driving current according to the high-temperature modulation signal, and the light modulation signal high-temperature driving current is smaller than the light modulation signal driving current;
and the micro control unit is also used for inputting a boosting adjustment signal to the Mach-Zehnder driver when the temperature corresponding to the resistance value is greater than a second preset threshold value, the Mach-Zehnder driver increases the voltage swing according to the boosting adjustment signal to obtain a boosting modulation signal, and the boosting modulation signal is input to the Mach-Zehnder modulator.
7. The light ceiling device according to claim 2, further comprising: the first monitoring detector is used for monitoring the light intensity value of the output light beam of the laser, the light intensity value is input into the micro control unit, the micro control unit compares the light intensity value with a first storage value, and when the light intensity value is lower than the first storage value, a first replacing signal is generated.
8. The light ceiling device according to claim 2, further comprising: and the second monitoring detector is used for monitoring the light intensity value of the output light beam of the Mach-Zehnder modulator, inputting the light intensity value into the micro control unit, comparing the light intensity value with a second stored value by the micro control unit, and generating a second replacement signal when the light intensity value is lower than the second stored value.
9. The light ceiling device of claim 4, further comprising: and the micro control unit receives an externally input light modulation and demodulation signal through the general input and output interface.
10. The light ceiling device according to claim 9, further comprising: the universal input/output interface, the micro control unit, the Mach-Zehnder driver, the thermistor and the low-dropout linear regulator are all arranged on the PCB.
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