JP2006279246A - Optical transmission apparatus and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmission apparatus the optical module of which is downsized and highly sophisticated and which realizes a flexible countermeasure against revision of an external control interface specification and to provide an optical characteristic control method thereof. <P>SOLUTION: The optical transmission apparatus including a control section 11 for controlling an optical characteristic on the basis of monitor information of the transmission/reception optical module 1 for converting an electric signal into an optical signal and converting the optical signal into the electric signal includes an external host device 2 or an external memory 3 for storing a program coping with various status information items of the transmission/reception optical module 1 via the control section 11 and an external interface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

In the present invention, the control unit is a microprocessor or FPGA (Field Programmable Gate Array).
In particular, the control unit that controls the transmission / reception optical module transmits the module status information to the outside, and the external host device or the memory device can control the program of the control unit based on the status information. The present invention relates to an optical transmission apparatus that realizes miniaturization and high functionality of an optical module control unit and a control method therefor, since it is not necessary to store all programs in the control unit itself by rewriting.

  In the conventional optical module, the optical output power, the extinction ratio, the wavelength, the reception sensitivity (signal identification threshold setting, APD control control), and the like, which are optical characteristics, are controlled by the control unit by calculating the optimum control amount. In addition, the control unit has a control function that assumes all states such as deterioration of each control device such as LD (Laser Diode) and APD (Avalanche Photo Diode) and various optical module use conditions.

  FIG. 10 is a block diagram of a conventional transmission / reception optical module. In the figure, reference numeral 1 denotes a transmission / reception optical module for converting an electrical signal into an optical signal, which is mainly used for a core device for optical communication such as an optical repeater or a subscriber meter terminal device. A control unit 11 is configured by a microprocessor, an FPGA (Field Programmable Gate Array), and the like, and controls the transmission / reception optical module 1 and the LD 13. Reference numeral 12 denotes a drive unit for the LD 13, which drives the LD 13 to optically output data controlled by a control signal from the control unit. Reference numeral 13 denotes a laser diode (LD) that emits laser light, which outputs light. Reference numeral 14 denotes a temperature sensor that detects the ambient temperature of the LD 13 and the APD 19. Reference numeral 15 denotes an APD controller that controls the voltage of the APD 19. The relationship between APD 19 and voltage control is that the avalanche effect, which is an abrupt current amplification action generated in a semiconductor, is used for photocurrent multiplication. When a reverse bias near the breakdown voltage is applied to a semiconductor pn junction, the depletion layer An electric field is applied to the region. Here, the carriers generated by the internal photoelectric effect are doubled. The photocurrent amplification factor increases with the reverse bias voltage, and is maximized at the breakdown voltage. Reference numeral 16 denotes a CDR (Clock Data Recovery) which extracts / reproduces a clock from an input waveform. A limit amplifier 17 is an amplifier that amplifies the voltage of the input voltage signal. If there is noise in the input waveform, it can be adjusted by setting the signal identification threshold. A preamplifier 18 is a preamplifier for converting a current signal into a voltage signal. Reference numeral 19 denotes an avalanche photodiode (APD), which is a phenomenon in which the number of electrons and holes is increased like an avalanche by running electrons or holes in a semiconductor with a high electric field (avalanche multiplication). Photodiode using phenomenon). Since the current can be taken out by multiplying the number of electrons and holes generated by light absorption, it has higher sensitivity than a PIN photodiode.

  With the above configuration, the control unit 11 calculates and controls an optimal control amount.

  However, it is necessary to use a microprocessor or FPGA with a large programming capacity in order to give the control unit a function of performing a wide variety of controls with high accuracy, and as a result, the device becomes large. This has been a big problem for miniaturization and high functionality of optical modules, which is a requirement of users. Furthermore, it has been difficult to respond flexibly to complicated external interface (such as I2C) specifications and fluid changes.

On the other hand, with respect to a control program in the optical disk drive device, an optical disk system that can be rewritten to a control program from an external host as necessary based on its internal state is considered. There is nothing. (For example, see Patent Document 1)
JP-A-10-134500

  In order to solve the above-described conventional problems, the present invention reduces the size and functionality of a control unit of a transmission / reception optical module by transferring a part of the function of transmission / reception optical module control to an external host or memory. It is an object of the present invention to provide an optical transmission device and a control method for the optical transmission device.

  A first invention for solving the above-described problem is an optical transmission having a control unit that controls an optical characteristic based on monitor information of a transmission / reception optical module that converts an electrical signal into an optical signal and converts the optical signal into an electrical signal. The apparatus includes an external host device or a memory in which programs corresponding to various status information of the transmission / reception optical module are stored via the control unit and an external interface.

  According to the first aspect of the present invention, optical transmission capable of realizing downsizing and high functionality of the transmission / reception optical module control unit by holding the rewriting program provided in the conventional control unit in an external host device or memory. Equipment can be provided.

  A second invention is the optical transmission apparatus according to claim 1, wherein the control unit internally processes monitor information for monitoring an operation state of the transmission / reception optical module to generate status information. And status information transmission means for transmitting the status information to the host device, and optical characteristic control for controlling the optical characteristics of the transmission / reception optical module by a rewriting program updated by writing an optimum program under the control of the host device And a program for selecting the optimum program corresponding to the received status information, and a program for instructing the controller to write the selected optimum program to the controller. Has writing means.

  According to the second aspect of the present invention, since the optimum program is selected by the control of the host device, the optical transmission / reception apparatus that can operate with only the minimum necessary program can be provided in the transmission / reception optical module control unit.

  According to a third aspect of the present invention, there is provided the optical transmission apparatus according to claim 1, wherein the control unit internally processes monitor information for monitoring an operation state of the transmission / reception optical module to generate status information. And a program reading means for selecting the optimum program corresponding to the status information from the rewriting program stored in the memory and reading it into the own control unit, and the read / updated reprogramming program for the transmission / reception optical module. It has a light characteristic control means for controlling the light characteristic.

  According to the third aspect of the invention, since the control unit performs selection control of the optimum program, the program capacity is increased as compared with the second aspect of the invention, but an optical transmission apparatus that does not need to transfer status information can be provided.

A fourth invention is the optical transmission apparatus according to claim 1,
The control unit internally processes monitor information for monitoring the operating state of the transmission / reception optical module to create status information, status information transmission means for transmitting the status information to the host device, Program reading means for reading an optimum program at an arbitrary time from an external memory in which an optimum program corresponding to status information is stored, and optical characteristic control for controlling the optical characteristics of the transmission / reception optical module by a read and updated rewriting program And a program selection means for selecting an optimal program corresponding to the received status information, and a program document for transferring the selected optimal program to an external memory and instructing writing to the external memory. And the external memory is an optimum program. Having a storage means for temporarily storing the ram.

  According to the fourth aspect of the invention, the control unit can provide an optical transmission apparatus that can read from the external memory when it is time to read the program.

  5th invention is the optical characteristic control method of the optical transmission apparatus which controls an optical characteristic based on the monitor information of the transmission / reception optical module which converts an electrical signal into an optical signal, and converts an optical signal into an electrical signal, A step of monitoring monitor information, a step of creating status information of the transmission / reception optical module based on the monitor information, and a step of selecting an optimum program corresponding to the created status information from an external host device or memory And a step of rewriting the optical characteristic control program of the transmission / reception optical module to the optimal program, and a step of controlling the optical characteristic of the transmission / reception optical module using a program updated by the optimal program.

  According to the fifth aspect of the invention, it is possible to provide an optical transmission device control method that realizes a procedure for replacing a rewriting program held in an external host device or memory with an optimum program corresponding to status information.

  As described above, according to the transmission / reception optical module of the present invention, it is possible to constantly monitor the state by each monitor and download a program capable of optimal control when the control is severe to improve characteristics and quality. In addition, because it operates with only the minimum necessary programs according to the usage conditions and operating state of the transmission / reception optical module, the programming capacity of the microprocessor, FPGA, etc. can be reduced while satisfying the necessary control functions, and the optical module can be downsized. Is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in order to make an understanding easy through the whole figure, the same code | symbol shall be attached | subjected and shown to the same location.

  FIG. 1 is a configuration diagram of a transmission / reception optical module according to a first embodiment of the present invention. In the figure, 2 is a host device provided outside the transmission / reception optical module 1, and 3 is a memory provided outside the transmission / reception optical module 1.

  In the transmission / reception optical module 1, the transmission unit controls the optical output power and the extinction ratio based on the temperature and the PD monitor information of the LD 13, and the wavelength characteristics are controlled by the temperature information from the temperature sensor 14. As for the receiving unit, the APD controller 15 controls the APD 19 based on the temperature information from the temperature sensor 14, and the signal identification threshold setting is controlled based on the signal error rate monitor information from the CDR 16.

  The host device 2 or the memory 3 has a rewriting program such as a microprocessor or FPGA, and can be rewritten as necessary.

  The control unit 11 is configured to use a microprocessor, FPGA, etc., and internally processes each monitor information (PD monitor, wavelength monitor, temperature monitor, error rate monitor, etc.), and sends the status information to the external host device 2 or The data is transmitted to the memory device 3. After that, by receiving the optimum program that matches the status information, highly accurate control is performed with the updated program.

  The rewriting of the program is performed by monitoring the operation state using a monitor function (PD monitor, wavelength monitor, temperature monitor, error rate monitor, etc.) included in the transmission / reception optical module 1 itself, and from the controller 11 to the external host device 2 or On the other hand, the optimum program suitable for the status information is taken into the control unit 11 from the host device 2 or the memory device 3.

  Below, rewriting of a program is demonstrated concretely.

  FIG. 11 is a diagram showing the LD current-temperature characteristics of the LD. For high-accuracy control corresponding to the temperature change of the optical output power, the control unit always monitors the temperature information from the temperature sensor, and based on the monitored temperature information, the control unit displays the temperature regions a, b, It is determined in which region of c, d, and e. When the temperature changes and the temperature range further changes, the control unit detects that the temperature range has changed, changes the status information, and notifies rewriting (= corresponds to status information). The host side receives the changed status information, recognizes the change from the previous information, and performs a program rewrite process (program upload). The optical module rewrites the program to a new temperature region program and performs control again.

  For this reason, when the entire temperature range is controlled collectively as in the conventional case, a control error occurs for the entire temperature range between the actual LD current-temperature characteristics and the approximate expression used in the control due to program capacity constraints. It was.

  This time, by dividing the temperature range into several parts and rewriting the control program at each temperature, the error of LD current-temperature characteristics and approximation formula of LD is reduced even with a small program capacity, and highly accurate control is possible. Done. Further, the same control can be performed for the extinction ratio control.

  As for the signal identification threshold value, the signal error rate changes when the input optical waveform of the receiver of the optical transceiver module changes. Therefore, the signal identification threshold value is rewritten to a new program based on the information of the CDR16 signal error rate monitor, and the signal identification level is optimized. It is to become.

  During the operation of the optical module, the control unit always monitors the error rate characteristic from the CDR, and the control unit determines whether or not it deviates from the program rewrite determination threshold based on the monitored error rate information. If the input waveform changes and, as a result, the error rate characteristic deviates from the threshold value, the control unit detects that the threshold value is deviated, changes the status information, and notifies rewrite (= corresponds to status information). . The host side receives the changed status information, recognizes the change from the previous information, and performs a program rewrite process (program upload). The optical module rewrites the program to a new temperature region program and performs control again.

  FIG. 18 is a waveform diagram of the input to the receiving unit, FIG. 19 is a waveform diagram of the receiving unit according to the present invention (after ASE superposition), and FIG. 20 is an error rate characteristic diagram according to the present invention.

  For example, a case where ASE (Amplified Spontaneous Emission) is superimposed will be described as an example. When the input waveform is the waveform of FIG. 18 in the receiving unit, the level a to c become the eye opening of the waveform, and the signal identification level Is set to b which is the center of a and c, and the signal error rate characteristic is good quality of BER (2) of FIG. 20, but ASE as shown in FIG. 19 is superimposed from the waveform of FIG. When the waveform changes to an input waveform (noise to a high level of the signal), the error rate characteristic deteriorates as shown by BER (1) in FIG. 20 at the signal identification level as shown in FIG.

  For this reason, a threshold for program rewriting judgment is set in the error rate characteristic (specifically, arbitrarily set between BER (1) and (2)). In order to maintain the reception characteristics (the signal identification level is set from b to B in FIG. 19).

FIG. 17 is a reverse voltage-temperature characteristic diagram of an APD according to the present invention. For high-accuracy control corresponding to the temperature change of the APD bias voltage, the control unit always monitors the temperature information from the temperature sensor during operation of the optical module, and the control unit is shown in FIG. 17 based on the monitored temperature information. It is determined in which of the temperature regions a, b, c, d, and e. When the temperature changes and the temperature range further changes, the control unit detects that the temperature range has changed and changes the status information. The host side receives the changed status information and performs a recognition program rewrite process (program upload) for the change from the previous information. The optical module rewrites the program to a new temperature range program and performs control again. When the entire temperature range is controlled at once as in the past, the actual APD reverse voltage vs. temperature characteristics due to program capacity constraints. In the approximate expression used in the control, a control error occurred over the entire temperature range. This time, by dividing the temperature range into several parts and rewriting the control program at each temperature, the error of the reverse voltage-temperature characteristics of the APD and the approximate expression is reduced even with a small program capacity. Done.

  LDs used in a wide range of control light transmission / reception modules corresponding to deterioration of elements (LD, TEC) used in the optical transmission / reception modules have optical output power characteristics of the optical transmission / reception module characteristics due to changes in characteristics over time. Change.

  FIG. 12 is an optical output power characteristic diagram according to a change in the IL characteristic of the LD. The present invention is a wide range control corresponding to the aging change of the optical output power, and the optical output power is reduced when the initial setting value is obtained due to the characteristic change as shown in FIG.

  FIG. 13 is a change characteristic diagram of the optical output power of the optical transmission module. As described above, as a result of the characteristic change, the optical output power is reduced when the initial setting value is reached. As a result, the optical output power is reduced on the time axis as shown in FIG.

  FIG. 14 is a characteristic diagram of an optical output power monitor PD of an LD according to the present invention. This time, according to the present invention, the monitor PD characteristic for monitoring the optical output power is monitored, and based on the monitored monitor PD characteristic information, the control unit displays the temperature regions a, b, c, d, e shown in FIG. Determine which area you are in. If the optical output power changes, and as a result, the monitor PD characteristics change and the area further changes, the control unit detects that the area has changed, changes the status information, and notifies rewriting (= status information). To correspond). The host side receives the changed status information, recognizes the change from the previous information, and performs a program rewrite process (program upload). The optical module rewrites the program to a new temperature region program and performs control again.

  FIG. 15 is an IL characteristic diagram of the LD according to the present invention. Since the setting is changed to the setting value corresponding to the characteristic change in FIG. 15, the optical output power can be improved. At this time, temperature information is also obtained at the same time, and the characteristic change due to temperature is controlled so as not to be affected by the control.

FIG. 16 is a characteristic change characteristic diagram of the TEC current-temperature of the TEC according to the present invention. The TEC used in the optical transceiver module changes in temperature characteristics due to changes in characteristics over time, and as a result, wavelength characteristics change. When the optical module is in operation, the control unit always monitors the TEC current information with respect to the temperature (ambient temperature) from the drive unit, and the control unit uses the monitored TEC current information to determine the current regions a, b, and c shown in FIG. , D, it is determined in which region. When the TEC current changes and the TEC current region further changes, the control unit detects that the TEC current region has changed, and changes the status information. The host side receives the changed status information, recognizes the change from the previous information, and performs a program rewrite process (program upload). The optical module rewrites the program to a new temperature region program and performs control again.

  FIG. 1 differs from the configuration described as the transmission / reception optical module according to the prior art in FIG. 10 by transferring various programs of the transmission / reception optical module 1 to the external host device 2 or the memory 3. The control unit 11 is reduced in size and increased in functionality, and the rewriting program is held in the external host device 2 or the memory 3.

  FIG. 2 is a block diagram showing an embodiment of the transmission / reception optical module controller in FIG. In the figure, 111 is a CPU that performs overall control of the control unit, 112 is a FLASH memory that is used in a program writing area, 113 is an EEPROM (Electrically Erasable Programmable Read-Only Memory) that is used for adjustment data, and 114 is a program process. RAM (Random Accsess Memory) used as a variable in the system, 115 is an analog-digital converter (ADC) for converting various monitor information as analog signals into digital signals, 116 is an interface with an external host device or memory, Reference numeral 117 denotes a temperature sensor, and 118 denotes a digital-analog converter (DAC) that converts a digital signal into a set value output that is an analog signal. This control unit performs various types of control of the transmission / reception optical module for each configuration using a microprocessor, FPGA, or the like.

  FIG. 3 is a block diagram showing an embodiment of the host device in FIG. In the figure, 21 is a control unit, 22 is a memory unit in which all programs A, B, C... N corresponding to all states (light output, extinction ratio, wavelength setting) are stored, and 23 is an external interface. It is a certain 2wire-interface buffer. The 2-wire-interface buffer is a serial interface for transmitting information between devices located relatively close to each other by two signal lines SCL (Serial Clock) and SDA (Serial Data).

  The host device selects an optimum program in the memory 22 under the control of the control unit 21 based on the status information transmitted from the control unit according to the external interface (2wire-interface: I2C) specification. The selected optimum program is transferred and written to the transmission / reception optical module control unit under the control of the control unit 21.

  FIG. 4 is an explanatory diagram of information transmission between the transmission / reception optical module control unit and the host device or memory. (A) Program writing by the host device, (b) Program reading by the control unit, (c) Arbitrary timing by the control unit The program is read in.

  (A) In the program writing by the host device, the control unit 11 internally processes each monitor information detected in the transmission / reception optical module 1 and transmits the status information to the external host device 2. The host device 2 confirms the status information sent from the control unit 11 and performs internal processing, and selects the optimum program from the programs A, B, C... Stored in the memory 22. The selected optimum program is instructed to be written to the control unit 11 under the control of the host device 2. Thereafter, the control unit 11 performs high-precision control with the updated program.

  (B) When the program is read by the control unit, the control unit 11 itself monitors the operation state using each monitor information, and based on the operation state, the programs A, B, C stored in the external memory 3 are monitored. Read and control the optimal program from Thereafter, the control unit 11 performs high-precision control with the updated program.

  (C) In reading the program at an arbitrary timing by the control unit, the control unit 11 internally processes each monitor information detected in the transmission / reception optical module 1 and transmits the status information to the external host device 2. The host device 2 confirms the status information sent from the control unit 11 and performs internal processing, and selects the optimum program from the programs A, B, C... Stored in the memory 22. The selected optimum program is instructed to be written to the external memory 3 ′ under the control of the host device 2. When it is time to read the program, the control unit reads and controls the optimum program from the memory 3 '. Thereafter, the control unit 11 performs high-precision control with the updated program.

  FIG. 5 is a flowchart of the transmission / reception optical module control method according to the second embodiment of the present invention. Hereinafter, the operation flow of FIG. 5 will be described with reference to FIG.

  S1. The control unit 11 monitors various monitor information such as a PD monitor, a wavelength monitor, a temperature monitor, and an error rate monitor.

  S2. The control unit 11 creates status information corresponding to the various monitor information described above.

  S3. Compared with the previous status state, if the status is different, the program rewrite process is performed, and if the status is the same, the program rewrite process is not performed.

  S4. An optimum program (optimum program) suitable for the status information is selected from a group of programs stored in the external host device 2 or the external memory 3.

  S5. The computer program of the control unit 11 is rewritten with an optimal program.

  S6. The control unit 11 controls the optical characteristics of the transmission / reception optical module 1 with the updated program.

  FIG. 6 is a detailed flowchart of the transmission / reception optical module control method in FIG.

  S7. The temperatures of the LD 13 and the APD 19 of the transmission / reception optical module 1 are read.

  S8. The read temperature value is compared with the threshold value.

  S9. If the read temperature value is outside the threshold value as a result of S8, the program rewrite flag is enabled.

  S10. If the read temperature value is within the threshold value as a result of S8, the current of the APD 19 is read.

  S11. The read current value is compared with the threshold value.

  S12. If the read current value is outside the threshold value as a result of S11, the program rewrite flag is enabled.

  S13. As a result of S11, if the read current value is within the threshold value, the wavelength of the LD 13 is read.

  S14. The read temperature value is compared with the threshold value.

  S15. If the read wavelength is outside the threshold as a result of S14, the program rewrite flag is enabled.

  S16. If the read wavelength is within the threshold value as a result of S14, the clock extraction / reproduction error rate of the CDR 16 is read.

  S17. The read error rate is compared with the threshold value.

  S18. If the read error rate is outside the threshold as a result of S17, the program rewrite flag is enabled.

  S19. If the read error rate is within the threshold as a result of S17, the flag status is checked.

  S20. Next, the rewrite flag is checked, and if it is not enabled, the process returns to step S6.

  S21. As a result of S20, if the rewrite flag is enabled, the program is rewritten.

  S22. Latch processing of the setting unit (DAC 118) is performed.

  S23. Output status information or download program information to the host device 2.

  S24. Download the requested program.

  S25. The control part 11 starts a rewriting program.

  S26. The latch of the setting unit (DAC 118) is released.

  FIG. 7 is a block diagram of a malfunction prevention function and a holding function of a transmission / reception optical module according to an embodiment of the present invention. In the figure, 4 is a malfunction prevention processing unit, and 5 is a holding (latch) unit. The optical module normally controls each control unit (light output, extinction ratio, wavelength, APD control, signal identification level) based on each monitor information. At the time of program rewriting, even when the operation of the microprocessor or FPGA is temporarily stopped, the control unit needs to keep (latch) the control amount so as not to affect the optical transmission / reception function. In order to perform this holding (latch) operation, a function of preventing malfunction and a holding (latch) operation as shown in FIG. 7 are provided separately from the microprocessor and FPGA.

  By having this configuration, the transmission / reception optical module 1 can hold (latch) the control amount during the program update, and an erroneous signal from the microprocessor or FPGA during the program update or noise in the optical module It is possible to prevent erroneous release of the holding (latch) operation due to the above.

  FIG. 8 is an explanatory diagram of the control parameter / variable storage function of the transmission / reception optical module in one embodiment of the present invention. In the figure, the “control parameter / variable” is stored in the memory 6 before updating the program, and the “control parameter / variable” is read from the memory 6 after the update. As a result, the control amount calculation method can be changed while inheriting the “control parameter / variable” before and after the program update.

  The specific procedure is as follows.

  (1) Save “control parameters / variables” in memory 6.

  (2) Update code and program from external host device 2 or memory 3.

  (3) Read “control parameter / variable” from memory 6.

  (4) The control unit 11 calculates and outputs each controlled variable.

  FIG. 9 is an explanatory diagram of a malfunction prevention function when an error occurs in the transmission / reception optical module according to an embodiment of the present invention, where (a) default reading and (b) program writing before writing.

(A) Default reading The procedure of a specific control method is as follows.

  (1) Save the program in the “default program” memory 7 before updating the program.

  (2) Write code and program from external host device 2 or memory 3.

  (3) The occurrence of a communication error or write error is detected by the program check when the program is rewritten.

  (4) Read the “default program” from memory 7 and start it.

  (5) The control unit 11 calculates and outputs each control amount by the “default program”.

  By the above procedure, it is possible to prevent an erroneous program from being written due to an error at the time of program rewriting and causing the control unit 11 to malfunction.

(B) Program writing before writing The procedure of a specific control method is as follows.

  (1) Write code and program from external host device 2 or memory 3.

  (2) The occurrence of a communication error or write error is detected by the program check when rewriting the program.

  (3) The “program before writing” is written and activated from the external host device 2 or the external memory 3.

  (4) The control unit 11 calculates and outputs each control amount by the “program before writing”.

  By the above procedure, it is possible to prevent an erroneous program from being written due to an error at the time of program rewriting and causing the control unit 11 to malfunction.

  The following additional notes are further disclosed with respect to the embodiment including the above examples.

  (Supplementary note 1) An optical transmission apparatus having a control unit that controls optical characteristics based on monitor information of a transmission / reception optical module that converts an electrical signal into an optical signal and converts the optical signal into an electrical signal, An optical transmission device comprising an external host device or memory storing a program corresponding to various status information of a transmission / reception optical module via an external interface.

  (Additional remark 2) It is an optical transmission apparatus of Claim 1, Comprising: The said control part, The status information creation means which produces the status information by carrying out the internal process of the monitor information which monitors the operation state of the said transmission / reception optical module, Status information transmission means for transmitting the status information to the host apparatus; and optical characteristic control means for controlling the optical characteristics of the transmission / reception optical module by a rewriting program updated by writing an optimum program under the control of the host apparatus. The host device has a program selection means for selecting an optimum program corresponding to the received status information, and a program writing for transferring the selected optimum program to the control unit and instructing the control unit to write An optical transmission device comprising means.

  (Additional remark 3) It is an optical transmission apparatus of Claim 1, Comprising: The said control part internally processes the monitor information which monitors the operation state of the said transmission / reception optical module, The status information preparation means which produces status information, Program reading means for selecting the optimum program corresponding to the status information from the rewriting program stored in the memory and reading it into the own control unit, and the optical characteristics of the transmission / reception optical module by the rewritten program read and updated An optical transmission device comprising optical characteristic control means for controlling the optical transmission.

(Additional remark 4) It is an optical transmission apparatus of Claim 1, Comprising: The said control part, The status information creation means which creates the status information by carrying out the internal process of the monitor information which monitors the operation state of the said transmission / reception optical module, Status information transmitting means for transmitting the status information to the host device, program reading means for reading the optimal program at an arbitrary time from an external memory in which the optimal program corresponding to the status information is stored, and read and updated An optical characteristic control unit configured to control optical characteristics of the transmission / reception optical module by a rewriting program, wherein the host device selects a program selection unit that selects an optimal program corresponding to the received status information; and the selected optimal program A program that transfers to the external memory and gives instructions to write to the external memory Having ram writing means,
The optical transmission apparatus, wherein the external memory has storage means for temporarily storing an optimum program.

(Additional remark 5) It is the optical characteristic control method of the optical transmission apparatus which controls an optical characteristic based on the monitor information of the transmission / reception optical module which converts an electrical signal into an optical signal, and converts an optical signal into an electrical signal,
A step of monitoring the monitor information, a step of creating status information of the transmission / reception optical module based on the monitor information, and an optimum program corresponding to the created status information is selected from an external host device or memory A step of rewriting the optical characteristic control program of the transmission / reception optical module with the optimal program, and a step of controlling the optical characteristic of the transmission / reception optical module using a program updated by the optimal program. Control method of optical transmission apparatus.

  (Supplementary Note 6) The optical transmission apparatus according to claim 1, further comprising a malfunction prevention unit that temporarily holds a control amount of the control unit in advance when the optimum program is read or written. Optical transmission device.

  (Supplementary note 7) The optical transmission device according to claim 1, further comprising a memory for preliminarily storing control parameters / variables of the control unit when the optimum program is read or written. .

  (Supplementary note 8) The optical transmission apparatus according to claim 1, further comprising a memory that stores in advance a default program to be used when an error occurs during reading or writing of the optimum program. Transmission equipment.

  (Supplementary note 9) The optical characteristic control method of the optical transmission device according to claim 5, wherein the optimum program is checked when the optimum program is read or written, and rewritten when an error is detected by the program check. And a step of rewriting the previous program.

  INDUSTRIAL APPLICABILITY The present invention can be used for a core device for optical communication such as an optical repeater using a transmission / reception optical module or a subscriber terminal device.

It is a block diagram of the transmission / reception optical module in 1st embodiment of this invention. It is a block diagram which shows one Example of the transmission / reception optical module control part in FIG. It is a block diagram which shows one Example of the host apparatus in FIG. It is explanatory drawing (a), (b), and (c) of the information transmission between a transmission / reception optical module control part and a host apparatus or memory. It is a flowchart of the transmission / reception optical module control method in 1st Embodiment of this invention. It is a detailed flowchart of the transmission / reception optical module control method in FIG. It is a block diagram of the malfunction prevention function and holding | maintenance function of the transmission / reception optical module in one Embodiment of this invention. It is explanatory drawing of the control parameter / variable preservation | save function of the transmission / reception optical module in one Embodiment of this invention. It is explanatory drawing (a) and (b) of the malfunction prevention function at the time of the error generation of the transmission / reception optical module in one Embodiment of this invention. It is a block diagram of the transmission / reception optical module by a prior art. It is LD current-temperature characteristic figure of LD. It is an optical output power characteristic figure by the IL characteristic change of LD. It is a change characteristic figure of the optical output power of an optical transmission module. FIG. 4 is a characteristic diagram of an optical output power monitor PD of an LD according to the present invention. It is an IL characteristic diagram of LD by this invention. It is a TEC current-temperature characteristic change characteristic view of TEC by the present invention. It is a reverse voltage-temperature characteristic view of APD by this invention. It is a receiving part input optical waveform figure by this invention. It is a receiver input optical waveform diagram (after ASE superposition) according to the present invention. It is an error rate characteristic view by the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission / reception optical module 2 Host apparatus 3 Memory 4 Malfunction prevention processing part 5 Holding | maintenance (latch) part 6, 7 Memory etc. 11 Control part 12 Drive part 13 Laser diode (LD)
14 Temperature sensor 15 APD controller 16 Clock data recovery (CDR)
17 Limit amplifier 18 Preamplifier 19 Apalanche photodiode (APD)
21 Control unit 22 Memory 12C buffer 23 2wire-interface buffer

Claims (5)

An optical transmission device having a control unit that controls optical characteristics based on monitor information of a transmission / reception optical module that converts an electrical signal into an optical signal and converts the optical signal into an electrical signal,
An optical transmission device comprising: an external host device or a memory in which a program corresponding to various status information of a transmission / reception optical module is stored via the control unit and an external interface. The optical transmission device according to claim 1,
The control unit internally processes monitor information for monitoring the operating state of the transmission / reception optical module to create status information, status information transmission means for transmitting the status information to the host device, An optical characteristic control means for controlling the optical characteristics of the transmission / reception optical module by a rewriting program updated by writing an optimal program under the control of the host device;
The host device includes program selection means for selecting an optimum program corresponding to the received status information, and program writing means for transferring the selected optimum program to the control unit and instructing writing to the control unit. ,
An optical transmission device characterized by that. The optical transmission device according to claim 1,
The control unit internally processes monitor information for monitoring the operation state of the transmission / reception optical module to create status information, and rewrites the optimum program corresponding to the status information in the memory An optical transmission apparatus comprising: a program reading means for selecting from a program for reading and reading to a self-control unit; and an optical characteristic control means for controlling the optical characteristics of the transmission / reception optical module by a read and updated rewriting program . The optical transmission device according to claim 1,
The control unit internally processes monitor information for monitoring the operating state of the transmission / reception optical module to create status information, status information transmission means for transmitting the status information to the host device, Program reading means for reading an optimum program at an arbitrary time from an external memory in which an optimum program corresponding to status information is stored, and optical characteristic control for controlling the optical characteristics of the transmission / reception optical module by a read and updated rewriting program Having means,
The host device includes program selection means for selecting an optimum program corresponding to the received status information, and program writing means for transferring the selected optimum program to an external memory and instructing writing to the external memory. ,
The optical transmission apparatus, wherein the external memory has storage means for temporarily storing an optimum program. An optical characteristic control method of an optical transmission device that controls optical characteristics based on monitor information of a transmission / reception optical module that converts an electrical signal into an optical signal and converts the optical signal into an electrical signal,
Monitoring the monitor information;
Creating status information of the transmit / receive optical module based on the monitor information;
Selecting an optimal program corresponding to the created status information from an external host device or memory;
Rewriting the optical characteristic control program of the transmission / reception optical module to the optimum program;
And a step of controlling optical characteristics of the transmission / reception optical module using a program updated by the optimum program.

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