TWI661686B - A message transparent transmission device for automatic adjusting optical wavelength scheme and method thereof - Google Patents

Abstract

The invention is an information transparent transmission device and method for an automatic wavelength adjustment mechanism, which is an optical module applied to a DWDM system and includes an adjustable laser, a laser driving circuit, a wavelength adjustment processor, and a photodetector. And an envelope detection circuit, in which the optical module uses a communication message to modulate the output optical signal to be transmitted, that is, the wavelength drive processor controls the laser drive circuit to output the laser drive current to the adjustable laser, This is used to control the intensity of the output optical signal. This modulation is based on the frame format and content of the transmitted communication message. The transmitted communication message is carried on the output optical signal to send the output optical signal to the remote end, and the photodetector receives it. The remote feedback light signal is filtered by the envelope detection circuit to generate a received communication message. The wavelength adjustment processor can analyze the received communication message to automatically adjust the wavelength, thereby achieving the purpose of monitoring and correcting the wavelength.

Description

Information transparent transmission device and method for automatic wavelength adjustment mechanism

The present invention relates to light wavelength transmission technology, and in particular, it relates to an information transparent transmission device and method for automatic adjustment mechanism of light wavelength.

Currently, Dense Wavelength Division Multiplexing (DWDM) systems used for optical signal transmission can be roughly divided into fixed-wavelength optical modules and adjustable optical modules. However, there are some applications Problems, for example, because each channel of the system needs to be bound to its corresponding optical module before it can be connected, which causes problems in supply and installation and a large number of materials, or the network management system needs to set the wavelength of the optical module, which may cause supply The problem is that the optical module itself requires high wavelength stability and is expensive.

In order to meet the needs of different channels of DWDM, if a fixed-wavelength optical module is used, a set of optical modules must be prepared for each channel. This is not only a troublesome installation. If there are many channels, the preparation of materials is also a major problem. In addition, if an adjustable optical module is used, an additional network management system is required to set the wavelength of the optical module, and the price of the optical module and the stability of its own wavelength are also Problems that need to be considered in practical application. In other respects, when the tunable optical module is used for wavelength stability, after a period of use, the problem of wavelength drift may occur. If it is not improved, the lighter will cause the optical power to drop, and the serious one will cause the optical signal to fail transmission.

Therefore, if an automatic adjustment mechanism of the light wavelength can be found, and the above problems can be improved, this is a goal that is urgently sought by those skilled in the art.

The purpose of the present invention is to provide an information transparent transmission device and method capable of automatically correcting the light wavelength without the need for the tedious installation, material preparation, and setting and adjustment of the wavelength of the optical module.

Another object of the present invention is to provide a mechanism for automatically adjusting the wavelength when light wavelength drifts, thereby improving the stability of the optical module and solving the problem that the conventional device is expensive.

The invention provides an information transparent transmission device for an automatic wavelength adjustment mechanism, which is applied to an optical module of a DWDM system. The optical module includes an adjustable laser, a laser driving circuit, a photodetector, and envelope detection. Circuit and wavelength adjustment processor, wherein a laser driving circuit is connected to the adjustable laser, the laser driving circuit converts the received high-speed transmission traffic into a laser modulation current, and modulates the pre-transmitted transmission communication message To generate a laser driving current, the laser driving circuit controls the adjustable laser to generate a corresponding output optical signal through the laser modulation current and the laser driving current, and then sends the output optical signal to another light Module, photodetector is used to receive the received light signal from the other optical module, and convert the received light signal into a corresponding one An electrical signal, an envelope detection circuit is connected to the photodetector, the envelope detection circuit receives the electrical signal from the photodetector, and filters the electrical signal to generate a receiving communication message corresponding to the received optical signal, and the wavelength adjustment processor The laser drive circuit and the envelope detection circuit are connected, the wavelength adjustment processor controls the laser drive current by transmitting the communication message, and analyzes the received communication message to output a wavelength control signal to adjust the adjustable laser The wavelength of the output optical signal.

In an embodiment, the optical module of the present invention further includes a high-speed signal amplification circuit connected to the photodetector, which is generated by receiving the electrical signal from the photodetector to amplify and shape the electrical signal. Receive traffic at high speed.

In another embodiment, the transmitted communication message includes an optical power signal and a wavelength adjustment signal, and the received communication message includes an optical power signal and a wavelength adjustment signal.

In yet another embodiment, the wavelength adjustment processor modulates the laser driving current at a low speed.

In yet another embodiment, the wavelength adjustment processor modulating the laser drive current further includes transmitting the communication message according to the frame format and content of the transmission communication message, so that the transmission communication message is carried in the output optical signal.

The invention further proposes a method for transparent transmission of information for an automatic wavelength adjustment mechanism, which is applied to an optical module of a DWDM system, so that the optical module performs the following steps: converting the laser driving circuit of the optical module The received high-speed transmission message is a laser modulation current; the wavelength adjustment processor of the optical module modulates the pre-transmitted transmission communication message, so that the laser driving circuit generates a laser driving current; and the laser The drive circuit modulates electricity through the laser. And the laser drive current to control the adjustable laser of the optical module to generate a corresponding output optical signal, and then send the output optical signal to another optical module; and cause the wavelength adjustment processor to An optical module receives and analyzes communication information to output a wavelength control signal. The wavelength control signal is used to adjust the wavelength of the output optical signal.

In an embodiment, making the wavelength adjustment processor adjust the wavelength of the output optical signal further includes the following steps: providing initial parameters of the pre-corrected channel; and causing the wavelength adjustment processor to set the wavelength of the adjustable laser as the pre-corrected channel. The wavelength corresponding to the parameter; the adjustable laser output carries the optical signal for transmitting the communication message; the wavelength adjustment processor sets the pre-calibration channel after receiving the communication message from the other optical module The parameter is the received pre-corrected channel parameter; and the wavelength of the adjustable laser is set to the wavelength corresponding to the pre-corrected channel parameter.

In yet another embodiment, after the adjustable laser output carries the optical signal for transmitting the communication message, when the wavelength adjustment processor does not receive the receiving communication message and the waiting time is greater than a preset time, the presetting is changed. Correct the channel parameters for the wavelength adjustment processor to reset the pre-corrected channel parameters that have been changed to the wavelength of the adjustable laser.

In another embodiment, after setting the wavelength of the tunable laser to the wavelength corresponding to the pre-corrected channel parameter, the method further includes the following steps: setting the channel parameter of the communication message to be the pre-corrected channel parameter; making the tunable The laser transmits the channel parameters of the communication message to the output optical signal to transmit to the other optical module; sets the received optical power of the transmitted communication message to the received optical power of the received communication message; makes the adjustable The laser transmits this The received optical power of the communication message is carried in the output optical signal to be transmitted to the other optical module; and the wavelength adjustment processor is configured to receive the received communication message returned by the other optical module to continuously execute the wavelength The adjustment processor analyzes the step of receiving the communication message, so as to monitor and correct the wavelength corresponding to the pre-calibration channel parameter.

With the above-mentioned information transparent transmission device and method of the present invention, the wavelength adjustment processor controls the laser driving device to adjust the laser driving current by controlling transmission of communication information, and the adjustable communication is carried by the adjustable laser transmission. The optical signal communicates with another optical module at the far end and achieves the purpose of correcting the channel. In addition, the wavelength can be monitored according to the received optical power signal in the communication message, so that when wavelength drift is encountered, the effect of correcting the drifted wavelength can be achieved.

1‧‧‧Optical Module

101‧‧‧ adjustable laser

102‧‧‧laser drive circuit

103‧‧‧wavelength adjustment processor

104‧‧‧Photodetector

105‧‧‧High-speed signal amplifier circuit

106‧‧‧Envelope detection circuit

111‧‧‧High-speed transmission

1110‧‧‧ Receive communication

1111‧‧‧wavelength control signal

112‧‧‧ Send Communication Message

113‧‧‧Laser drive current

114‧‧‧laser modulation current

115‧‧‧Output optical signal

116‧‧‧Receive optical signal

117, 118‧‧‧ Telegraph

119‧‧‧High-speed reception

S21 ~ S24‧‧‧‧Steps

S31 ~ S35‧‧‧‧step

S401 ~ S416‧‧‧Process

FIG. 1 is a schematic diagram of the internal composition of an optical module of a message transparent transmission device for an automatic adjustment mechanism of optical wavelength according to the present invention; FIG. 2 is a step diagram of a message transparent transmission method for an automatic adjustment mechanism of optical wavelength according to the present invention Figure 3 is a flowchart of the steps of adjusting the wavelength of the optical signal according to the present invention; and Figure 4 is a flowchart of the operation of the wavelength adjusting processor of the present invention.

The technical content of the present invention will be described below with specific embodiments. Those skilled in the art can easily understand the advantages and effects of the present invention from the content disclosed in this specification. However, the present invention can also be implemented by other different Specific implementation forms are implemented or applied.

Please refer to FIG. 1, which is a schematic diagram of the internal composition of the optical module of the message transparent transmission device for the automatic adjustment mechanism of the optical wavelength of the present invention. The information transparent transmission device of the present invention is applied to an optical module of a DWDM system. The optical module 1 includes an adjustable laser 101, a laser driving circuit 102, a wavelength adjustment processor 103, an optical detector 104, and a high-speed signal amplifier. Circuit 105 and envelope detection circuit 106.

The adjustable laser 101 is used for transmitting the output optical signal 115, and the adjustable laser 101 can be adjusted based on the information provided by the wavelength adjustment processor 103 to output the output optical signals 115 of different wavelengths.

The laser driving circuit 102 is connected to the adjustable laser 101. The laser driving circuit 102 converts the received high-speed transmission message 111 into a laser modulation current 114, and can adjust the pre-transmitted transmission communication message 112 to generate a laser. Driving current 113, wherein the laser driving circuit 102 controls the adjustable laser 101 through the laser modulation current 114 and the laser driving current 113 to generate a corresponding output optical signal 115, and then sends the output optical signal 115 to Another optical module at the far end. Specifically, the laser modulation current 114 converted after receiving the high-speed transmission message 111 can be used to transmit the information carried by the high-speed transmission message 111. Therefore, the laser driving circuit 102 can control the adjustable laser 101, and further An output optical signal 115 is generated which carries the information of the high-speed transmission service 111.

Laser drive current 113 controls the adjustable laser 101. For example, it can control the intensity of the output optical signal 115 of the adjustable laser 101. Specifically, the laser drive current 113 controls the adjustable laser 101. Of The amplitude of the output optical signal 115 is used to change the envelope of the output optical signal 115. In this way, part of the information to be transmitted can be modulated to the envelope of the output optical signal 115 to form a mechanism for re-modulating the optical signal.

In an embodiment, the wavelength adjustment processor 103 can modulate the laser driving circuit 102 at a low speed, that is, the wavelength adjustment processor 103 provides low-speed modulation information. Further, the laser drive current 113 can be controlled to modulate the information at a low speed. The output optical signal is 115.

The photodetector 104 is used to receive the received light signal 116 from another optical module at the far end, and convert the received light signal 116 into corresponding electrical signals 117, 118. The telecommunications signals 117 and 118 include high-speed transmission services and low-speed envelope signals. The telecommunications signals 117 and 118 are high-speed receiving services 119 and receiving communication messages 1110 fed back by another optical module at the far end, among which, receiving communication messages 1110 Including optical power signal and wavelength adjustment signal.

The envelope detection circuit 106 is connected to the photodetector 104. The envelope detection circuit 106 receives the electric signal 118 from the photodetector 104, and after filtering the electric signal 118, it generates a reception communication message 1110 corresponding to the received optical signal 116.

The wavelength adjustment processor 103 is connected to the laser driving circuit 102 and the envelope detection circuit 106. The wavelength adjustment processor 103 modulates the laser driving current 113 by transmitting a communication message 112, and outputs the wavelength control signal 1111 by analyzing and receiving the communication message 1110.俾 Adjust the wavelength of the output optical signal 115 of the adjustable laser 101. In addition, the wavelength adjustment processor 103 adjusts the laser driving current 113 according to the frame format and content of the transmission communication message 112 so that the transmission communication message 112 is carried in the output optical signal 115.

The optical module 1 of the present invention may further include a high-speed signal amplification circuit 105. Specifically, the high-speed signal amplification circuit 105 is connected to the photodetector 104, which can receive the electric signal 117 from the photodetector 104, and amplifies the electric signal 117 and the shaped electric signal 117 to generate a high-speed reception signal 119. Although the presence or absence of the high-speed signal amplifying circuit 105 does not affect the wavelength modulation, it can generate corresponding signals from optical signals from other optical modules, and is still an important component in the optical module 1.

The transmission communication message 112 may include an optical power signal and a wavelength adjustment signal, that is, by modulating the transmission communication message 112 to the output optical signal 115, the optical power signal and the wavelength adjustment signal may be transmitted to another remote end. An optical module is used as a set parameter. In detail, the laser driving current 113 is controlled by the wavelength adjustment processor 103 to adjust the transmission communication message 112 to be transmitted to the output optical signal 115 of the adjustable laser 101, that is, the transmission communication message 112 is transmitted. The optical power signal and wavelength adjustment signal are transmitted to another optical module at the far end. In addition, the wavelength adjustment processor 103 can output a wavelength control signal 1111, and use the wavelength control signal 1111 to adjust the wavelength of the output optical signal 115 output by the adjustable laser 101.

In this embodiment, the receiving communication message 1110 includes an optical power signal and a wavelength adjustment signal. In addition, the envelope detection circuit 106 has a filtering function, which can filter the high-speed transmission signal in the electrical signal 118 of the photodetector 104 and retain the received communication message 1110 therein. Then, the optical power signal included therein The wavelength adjustment signal and the wavelength adjustment signal are provided by the wavelength adjustment processor 103 for calculation, and the calculation result is controlled by the corresponding wavelength control signal 1111 to control the adjustable laser 101. Therefore, after the wavelength adjustment signal 103 is calculated by the wavelength adjustment processor 103 as a numerical parameter for setting the wavelength of the laser light, The optical power signal is used as the basis for whether the wavelength is shifted from the center wavelength, that is, for the wavelength drift phenomenon, the optical module 1 can perform calculations through the optical power signal to achieve the purpose of monitoring and correction.

In actual operation, the wavelength adjustment processor 103 can perform the following built-in settings: the wavelength adjustment processor 103 controls the output wavelength of the adjustable laser 101, the wavelength adjustment processor 103 controls the laser driving current 113 output by the laser driving circuit 102, and The wavelength adjustment processor 103 performs calculations according to the output signal of the envelope detection circuit 106, thereby controlling the laser driving circuit 102 and the adjustable laser 101.

Specifically, when the wavelength of the optical signal is shifted, the optical signal will be weakened accordingly, which will affect the quality and effect of the optical communication. Another remote optical module will feedback the received optical signal 116 with the received communication message 1110. After the wavelength adjustment processor 103 analyzes and receives the communication message 1110, it can monitor the wavelength shift of the light wavelength and adjust the value of the light wavelength, such as increasing the light wavelength. When the feedback communication message 1110 increases, the optical power signal continues to increase. The value of the optical wavelength until the feedback optical power signal decreases. Conversely, when the feedback received communication message 1110, the decrease of the optical power indicates that increasing the optical wavelength is the wrong direction. Therefore, the optical wavelength must be reduced.

In specific implementation, the device at the local end and the other end (remote) can be provided with the optical module 1 according to the present invention, so that communication information is added to the communication between the original local end and the other end (remote). To correct the wavelength. Further, after receiving the high-speed transmission message 111, the local optical module 1 generates a laser modulation current 114 via the laser driving circuit 102 to control the adjustable laser 101, and modifies the high-speed transmission message 111 into Output optical signal 115, and The wavelength adjustment processor 103 modulates the transmission communication message 112 into the output optical signal 115 modulated by the high-speed transmission signal 111 through the laser driving current 113. Therefore, the output optical signal 115 has the information of the high-speed transmission message 111, and the envelope of the output optical signal 115 forms the low-speed variable speed number carrying the transmission communication message 112, and then is transmitted to the other end (remote) optical module.

After the optical module at the other end receives the optical signal, that is, the local communication information contained in the optical signal will be received by the optical module at the other end and become the receiving communication message 1110 at the other end. The signal is converted into a corresponding electrical signal, and the envelope detection circuit 106 performs filtering to obtain the received communication information in the envelope, which is calculated by the wavelength adjustment processor 103, and then the communication information is transmitted and transmitted through the optical module at the other end. The optical signal of the message is fed back to the local end. The local end receives the communication message from the other end (remote), that is, the local end receives the communication message 1110. The photodetector 104 converts the received light signal 116, which contains the reception communication message 1110, into a telecommunication signal 118. Then, the envelope detection circuit 106 transmits the received communication message 1110 to the wavelength adjustment processor 103 for calculation, and then adjusts the wavelength of the optical signal to be output, and feeds back the communication message to the other end until the optical wavelength is corrected and the channel is confirmed.

In addition, the communication message may include an optical power signal, so that the wavelength adjustment processor 103 can monitor the current optical power and perform wavelength drift correction when the optical power decreases.

In summary, the operation mechanism of the information transparent transmission device for the automatic wavelength adjustment mechanism of the present invention is described in detail. The transmission of communication information is to control the laser drive circuit 102 to output to the adjustable mine through the wavelength adjustment processor 103. The drive current value of the radio 101 is slow, and the output is adjusted in small amplitude. The intensity of the light signal 115 is adjusted according to the frame format and content of the transmission communication message 112, so that the transmission communication message 112 can be carried on the output light signal 115 and transmitted to the other end. In addition, the communication message is received by low-pass filtering and signal shaping of the electrical signal 118 output by the photodetector 104 through the envelope detection circuit 106, so as to output a low-speed reception communication message 1110, and the wavelength adjustment processor 103 will receive communication based on this Message 1110 implements an automatic wavelength adjustment mechanism.

According to this, the present invention uses communication information to re-modulate the laser output optical signal 115 so that the communication and communication information can be transmitted to the other end, and the other end separates the communication and communication information after receiving the optical signal to complete the communication. Transmission, and implement automatic wavelength adjustment mechanism through communication messages. The message transparent transmission device of the present invention applies the automatic wavelength adjustment mechanism to a DWDM system. The automatic wavelength adjustment mechanism for transparent transmission light does not affect the traffic transmission, does not require additional network management resources, and does not require the cooperation of application equipment. The required communication information enables the automatic adjustment mechanism of the light wavelength to be easily and quickly introduced into the DWDM system, thereby reducing the overall construction cost.

Please refer to FIG. 2, which is a step diagram of the method for transmitting transparent information of the automatic wavelength adjustment mechanism of the present invention. The method of transmitting transparent information can be applied to the information transmitting device for the automatic adjustment of optical wavelength described above. in.

As shown in the figure, in step S21, the laser driving circuit of the optical module is configured to convert the received high-speed transmission traffic into a laser modulation current.

In step S22, the wavelength adjustment processor of the optical module is configured to modulate the pre-transmitted transmission communication message, so that the laser driving circuit generates a laser driving current.

In step S23, the laser driving circuit is caused to control the adjustable laser of the optical module through the laser modulation current and the laser driving current to generate a corresponding output optical signal, which is then sent to another optical module.

In step S24, the wavelength adjustment processor is caused to analyze the received communication information from another optical module to output a wavelength control signal. The wavelength control signal is used to adjust the wavelength of the output optical signal.

Please refer to FIG. 3, which is a step diagram of adjusting the wavelength of an optical signal according to the present invention. As shown in FIG. 3, please refer to FIG. 1 together to explain that the wavelength adjustment processor 103 performs the following steps when adjusting the wavelength of the output optical signal 115.

In step S31, initial parameters of the pre-corrected channel are provided. The initial parameters of the pre-corrected channel may be a channel ID or other type number, and a channel ID or other type number usually corresponds to a wavelength. The channel ID or other type number and its corresponding wavelength may be recorded in the wavelength adjustment processor 103.

In step S32, the wavelength adjustment processor is set to set the wavelength of the adjustable laser to the wavelength corresponding to the pre-corrected channel parameter. The wavelength corresponding to the parameter set in the wavelength adjustment processor 103 is transmitted, so that the wavelength adjustment processor 103 sets the adjustable laser 101 to output a light signal with a corresponding wavelength.

In step S33, the adjustable laser output is carried with a light signal for transmitting a communication message. The wavelength adjustment processor 103 loads the initial parameters in the output optical signal 115 by transmitting the communication message 112, so that the adjustable laser 101 outputs the output optical signal 115 carrying the communication message.

In step S34, the wavelength adjustment processor is configured to After receiving a communication message from an optical module, the pre-calibration channel parameter is set to the received pre-calibration channel parameter. In detail, the adjustable laser 101 transmits the output optical signal 115, so that the optical module at the other end receives and feedbacks the message. After the wavelength adjustment processor 103 determines the channel parameters contained in the message fed back by the optical module at the other end, it will receive The pre-corrected channel parameter value is used as the pre-corrected channel parameter.

In step S35, the wavelength of the adjustable laser is set to the wavelength corresponding to the pre-corrected channel parameter. In this step, the wavelength adjustment processor 103 uses the wavelength corresponding to the pre-calibrated channel parameter to set the tunable laser 101 to transmit an optical signal that can communicate with the optical module at the other end.

In addition, after the adjustable laser 101 outputs a light signal carrying a communication message 112, when the wavelength adjustment processor 103 does not receive the communication message 1110 and the waiting time is greater than a preset time, the pre-calibration channel parameters are executed. After the change, the wavelength adjustment processor 103 resets the changed pre-corrected channel parameter to the wavelength of the adjustable laser. Further, sometimes the calibration of the channel is not completed in a single time, that is, it may happen that the optical module 1 outputs an optical signal, but there is no feedback from the optical module at the other end. Therefore, the optical module 1 usually sets a preset time. When the wavelength adjustment processor 103 does not receive the received communication message 1110 from the other optical module, and waits longer than the preset time, it indicates the original time. The pre-correction channel parameters are different from the pre-correction channel parameters of the optical module at the other end. Therefore, the wavelength adjustment processor 103 can set the next pre-correction channel parameters, and then repeat step S32 to confirm the correct pre-correction channel parameters until receiving. Feedback from the optical module at the other end.

In another embodiment of the present invention, the method for transparently transmitting information of the automatic wavelength adjustment mechanism of the present invention after step S35, that is, after setting the wavelength of the adjustable laser 101 to the wavelength corresponding to the pre-corrected channel parameter, The method includes the following steps: setting the channel parameter of the communication message 112 as a pre-corrected channel parameter; making the adjustable laser 101 load the channel parameter of the communication message 112 in the output optical signal 115 for transmission to the other optical module; setting The received optical power of the communication message 112 is the received optical power of the communication message 1110; the adjustable laser 101 transmits the received optical power of the communication message 112 to the output optical signal 115 for transmission to the other optical module. .

Then, the wavelength adjustment processor 103 is made to receive the received communication message 1110 returned by another optical module, so as to continuously perform the steps of the wavelength adjustment processor 103 to analyze the received communication message 1110, so as to correspond to the pre-corrected channel parameters Monitoring and correction of wavelength. When the monitoring process finds that the optical power decreases, indicating that the optical wavelength has drifted, correct the value of the optical wavelength and perform the setting of the received optical power. For example, if the optical power decreases, adjust the optical wavelength to increase. If the feedback optical power rises, Then continue to increase the optical wavelength until the optical power decreases. Conversely, if the optical power decreases after increasing the optical wavelength, it means that the optical wavelength should be reduced until the drift phenomenon of the optical wavelength is corrected.

In order to further explain the present invention, please refer to FIG. 4, which is a flowchart of the operation of the wavelength adjustment processor of the present invention. Please refer to the schematic diagram of FIG. 1 together.

In process S401, the optical module is turned on. This process starts the optical module 1.

In flow S402, the pre-correction channel ID = 1. After optical module 1, Provide the initial value of the pre-calibration channel. Generally speaking, it can be set to 1. Usually in the wavelength adjustment processor 103, multiple channel IDs or numbers are memorized in advance, for example, channel ID = 1 ~ 30 or number 1 ~ 30, and each The channel ID or number corresponds to an optical wavelength, for example, the optical wavelength of channel ID = 1 is 1550 nm, the optical wavelength of ID = 2 is 1551 nm, etc. Therefore, in this embodiment, the initial parameter may be channel ID = 1.

In step S403, the laser wavelength is set to the pre-corrected channel ID wavelength. In short, the wavelength adjustment processor 103 is connected to and sets the wavelength of the tunable laser 101 as the wavelength corresponding to the pre-corrected channel parameter. For example, for example, the initial channel ID = 1 corresponds to the optical wavelength of 1550 nm, so the initial pre-corrected channel The wavelength of light is 1550nm, that is, the wavelength of light that can be output by the modulating laser 101 is 1550nm.

In step S404, the communication message = pre-calibration channel ID. In this process, the information of the channel ID is carried on the output optical signal 115 through a communication message.

In step S405, a communication message is transmitted to the remote end. In this process, the communication message 112 is transmitted to the remote end through the adjustable laser 101, that is, another optical module at the remote end.

In step S406, it is determined whether a remote communication message is received. In other words, the optical module 1 detects whether there is a receiving communication message 1110 received from the other optical module. If not, proceed to flow S407, otherwise, proceed to flow S409.

In step S407, it is determined whether the waiting time is greater than a set time. As described in the process S406, the optical module 1 does not receive the optical module at the other end. In the group, the optical module 1 will wait slightly. Once the waiting time is longer than the set time of the optical module 1, it means that the channel is wrong, and it will proceed to process S408.

In step S408, the channel ID + 1 is pre-corrected. When the waiting time is longer than the set time of the optical module 1, another parameter or the next parameter can be provided to the pre-calibration channel of the current optical module 1 until the optical module 1 can receive and receive the communication message. Specifically, when the optical signal with the initial channel ID = 1 is output by the adjustable laser 101, the communication message 1110 is not received. After waiting for the communication message 1110 to be longer than the preset time for receiving the communication message, it is provided. The value of the next parameter, for example, ID = 2, and then the process S403 is performed to set the adjustable laser with the new channel ID until a feedback message corresponding to the optical module at the other end is received.

In step S409, the pre-correction channel ID is set to the received pre-correction channel ID. As mentioned above, the process S406 is to determine whether the remote communication message is received. If the optical module 1 receives the communication message 1110 from the other optical module, the process is executed, and the pre-calibration received is about to be received. The parameter value of the channel is used as the pre-corrected channel parameter of the optical module.

In process S410, the laser wavelength is set to the pre-corrected channel ID wavelength. In this step, the wavelength corresponding to the pre-calibrated channel ID is set to the wavelength of the tunable laser 101, thereby outputting a light signal of the corresponding wavelength. In short, when the optical module 1 receives the receiving communication message 1110 feedback from the other end After that, the channel is correct, and the wavelength of the adjustable laser is set to the received pre-corrected channel parameter and its corresponding wavelength. For example, if the last received channel ID = 6, set the pre-corrected channel ID = 6, and when the channel ID = 6, its corresponding wavelength is 1556nm, then set the wavelength of the tunable laser 101 as 1556nm.

In step S411, the communication message = pre-calibration channel ID. In this process, the channel ID in the communication message to be sent is set to the pre-corrected channel ID contained in the communication message of the optical module at the other end.

In step S412, a communication message is transmitted to the remote end. That is, the transmission communication message 112 in the process S411 is transmitted to the optical module at the other end through the output optical signal 115 of the adjustable laser 101.

In step S413, the communication message = received optical power. In this process, the received optical power of the received communication message 1110 received by the optical module 1 is set to the transmitted communication message 112.

In step S414, a communication message is transmitted to the remote end. In this process, the received optical power of the communication message 112 is transmitted in the output optical signal and transmitted to the optical module at the other end through the adjustable laser 101.

In step S415, a communication message from the remote end is received. In short, when the wavelength adjustment processor 103 receives the received communication message 1110, it continuously analyzes the optical power and wavelength of the received communication message 1110. At this time, when the monitoring process finds that the optical power decreases, it means that the optical wavelength has drifted. Correct the value of the optical wavelength and return to step S413. For example, when the optical power decreases, adjust to increase the optical wavelength. If the feedback optical power increases, continue to increase the optical wavelength until the optical power decreases. Otherwise, if the optical wavelength increases, it will occur. When the optical power decreases, it means that the light wavelength should be reduced until the drift phenomenon of the light wavelength is corrected.

In flow S416, wavelength monitoring and correction are performed. Receive the light signal 116 and transmit the output light signal 115 through the foregoing iterative analysis. The wavelength of the optical signal of the module 1 can be used for monitoring and calibration purposes.

It can be known from the above that through the method of transparent transmission of information of the present invention, the optical module can automatically correct the wavelength and monitor whether the wavelength drifts at any time. When the wavelength shifts, the optical power is reduced to correct the wavelength, thereby maintaining the system to be normal. Operation.

In summary, the information transmission device and method for the automatic adjustment of the optical wavelength disclosed in the present invention can be based on re-modulating the communication information required by the automatic adjustment mechanism of the optical wavelength. The optical signal output from the modulated laser outputs low-speed communication information. The wavelength adjustment processor performs an automatic optical wavelength adjustment mechanism based on this communication information. It can be applied to the optical module of the DWDM system, thereby not affecting the transmission of information, Without the need for additional network management channels and application equipment, an automatic optical wavelength adjustment mechanism is introduced, that is, the wavelength of the corrected optical module is adjusted to maintain stability according to the communication information returned by the optical module at the other end, simplifying the use of complex mechanisms. Requirements, reduce the cost of optical modules, and can automatically search for and establish connection channels, eliminating the trouble of installation and material preparation, and then practical DWDM system.

The above-mentioned embodiment merely exemplifies the principle and effect of the present invention, and is not intended to limit the present invention. Anyone familiar with this technique can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the rights of the present invention should be listed in the scope of patent application described later.

Claims (8)

An information transparent transmission device used for an automatic wavelength adjustment mechanism is applied to an optical module of a DWDM system. The optical module includes: an adjustable laser; and a laser driving circuit connected to the adjustable laser. The laser driving circuit converts the received high-speed transmission traffic into a laser modulation current, and modulates a pre-transmitted transmission communication message to generate a laser driving current. The laser driving circuit passes the laser modulation current and The laser driving current controls the adjustable laser to generate a corresponding output optical signal, and then sends the output optical signal to another optical module; a photodetector for receiving the received light from the other optical module The signal is to convert the received light signal into a corresponding electrical signal. The envelope detection circuit is connected to the photodetector. The envelope detection circuit receives the electrical signal from the photodetector, and filters the electrical signal to generate a countermeasure. The communication signal that should receive the optical signal; the wavelength adjustment processor is connected to the laser drive circuit and the envelope detection circuit. The wavelength adjustment processor controls the laser driver by transmitting the communication message Dynamic current, and output wavelength control signal by analyzing the received communication message to adjust the wavelength of the output optical signal of the tunable laser; and a high-speed signal amplification circuit connected to the photodetector and receiving light from the photodetector The electric signal of the receiver is used for amplifying the electric signal and shaping the electric signal to generate high-speed receiving traffic. For example, the information transparent transmission device for the automatic wavelength adjustment mechanism in the first scope of the patent application, wherein the transmission communication message includes the optical power signal and the wavelength adjustment signal, and the reception communication message includes the optical power signal and the wavelength adjustment signal . For example, the information transmission device for the automatic wavelength adjustment mechanism of light in the scope of the patent application, wherein the wavelength adjustment processor adjusts the laser driving current at a low speed. An information transparent transmission device used for an automatic wavelength adjustment mechanism is applied to an optical module of a DWDM system. The optical module includes: an adjustable laser; and a laser driving circuit connected to the adjustable laser. The laser driving circuit converts the received high-speed transmission traffic into a laser modulation current, and modulates a pre-transmitted transmission communication message to generate a laser driving current. The laser driving circuit passes the laser modulation current and The laser driving current controls the adjustable laser to generate a corresponding output optical signal, and then sends the output optical signal to another optical module; a photodetector for receiving the received light from the other optical module The signal is to convert the received light signal into a corresponding electrical signal. The envelope detection circuit is connected to the photodetector. The envelope detection circuit receives the electrical signal from the photodetector, and filters the electrical signal to generate a countermeasure. Receive communication messages that should receive optical signals; and a wavelength adjustment processor connected to the laser drive circuit and the envelope detection circuit, the wavelength adjustment processor according to the signal frame for transmitting communication messages The modulation and content modulate the laser drive current at a low speed so that the transmitted communication message is carried on the output optical signal, and the received communication message is analyzed to output a wavelength control signal to adjust the output of the adjustable laser The wavelength of the optical signal. A method for transparent transmission of information for an optical wavelength automatic adjustment mechanism is applied to an optical module of a DWDM system, so that the optical module performs the following steps: The laser driving circuit of the optical module converts the received high speed The transmission message is a laser modulation current; the wavelength adjustment processor of the optical module modulates the pre-transmitted transmission communication message, so that the laser driving circuit generates a laser driving current; and the laser driving circuit passes the The laser modulation current and the laser drive current control the adjustable laser of the optical module to generate a corresponding output optical signal, and then send the output optical signal to another optical module; The received communication information generated based on the received optical signal of the other optical module is analyzed to output a wavelength control signal, which is used to adjust the wavelength of the output optical signal; and amplify the high-speed signal of the optical module. The circuit generates high-speed reception traffic according to the received light signal from the other optical module. For example, the method for transparently transmitting information of the optical wavelength automatic adjustment mechanism in item 5 of the scope of patent application, wherein making the wavelength adjustment processor adjust the wavelength of the output optical signal further includes the following steps: providing initial parameters of the pre-calibration channel; The wavelength adjustment processor sets the wavelength of the tunable laser to the wavelength corresponding to the pre-corrected channel parameter; causes the tunable laser output to carry the optical signal for transmitting the communication message; After receiving the communication message of the other optical module, the pre-corrected channel parameter is set as the received pre-corrected channel parameter; and the wavelength of the adjustable laser is set as the wavelength corresponding to the pre-corrected channel parameter. For example, a method for transparently transmitting information for an automatic wavelength adjustment mechanism of light in the patent application item 6, wherein after the adjustable laser output carries the optical signal for transmitting the communication message, when the wavelength adjustment processor does not receive When the communication message is received and the waiting time is longer than the preset time, the pre-corrected channel parameter is changed for the wavelength adjustment processor to reset the changed pre-corrected channel parameter to the wavelength of the adjustable laser. For example, a method for transparently transmitting information for an automatic wavelength adjustment mechanism of an optical wavelength according to item 6 or 7 of the application, wherein after setting the wavelength of the tunable laser to the wavelength corresponding to the pre-corrected channel parameter, the method further includes the following steps: The channel parameter for transmitting the communication message is the pre-corrected channel parameter; making the adjustable laser load the channel parameter for transmitting the communication message in the output optical signal to transmit to the other optical module; setting the transmission communication message The received optical power is the received optical power of the received communication message; causing the adjustable laser to load the received optical power of the transmitted communication message in the output optical signal for transmission to the other optical module; and the wavelength The adjustment processor receives the received communication message returned by the other optical module, and continuously performs the steps of the wavelength adjustment processor analyzing the received communication message, so as to monitor and correct the wavelength corresponding to the pre-corrected channel parameter.