WO2003065524A1 - Circuit integre a semi-conducteurs de commande de diode laser, module de transmission optique et procede de reglage de sortie optique - Google Patents

Circuit integre a semi-conducteurs de commande de diode laser, module de transmission optique et procede de reglage de sortie optique Download PDF

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Publication number
WO2003065524A1
WO2003065524A1 PCT/JP2003/000370 JP0300370W WO03065524A1 WO 2003065524 A1 WO2003065524 A1 WO 2003065524A1 JP 0300370 W JP0300370 W JP 0300370W WO 03065524 A1 WO03065524 A1 WO 03065524A1
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Prior art keywords
circuit
laser diode
input
transmission module
optical
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PCT/JP2003/000370
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English (en)
Japanese (ja)
Inventor
Takeshi Inagaki
Hajime Fujiwara
Tomomi Koyanagi
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Ntt Electronics Corporation
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Publication of WO2003065524A1 publication Critical patent/WO2003065524A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/0687—Stabilising the frequency of the laser

Definitions

  • the present invention relates to a semiconductor integrated circuit for controlling a laser diode, an optical transmission module on which the semiconductor integrated circuit is mounted, and a method for setting an optical output of the optical transmission module.
  • Wavelength division multiplexing known as a high-speed transmission technology using optical fibers, multiplexes multiple carriers using the property that light beams with different wavelengths do not interfere with each other. I do. For this reason, it is important for the WDM optical transmission module to keep the optical wavelength constant so that the carrier waves do not affect each other.
  • a distributed feedback laser diode (DFB—LD: Distributed Feed Back Laser Diode; hereinafter, simply referred to as LD) is often used as the light source of the WDM optical transmission module. Since the light wavelength of LD has a temperature dependency of about 0.1 nm / ° C, it is necessary to keep the temperature of LD constant to keep the light wavelength constant. Also, since the light intensity of the LD increases in proportion to the current when the current is equal to or higher than the light emission threshold current, the light intensity is usually controlled by controlling the bias current to the LD.
  • DFB distributed feedback laser diode
  • FIG. 6 shows an example of a conventional general optical transmission module for wavelength division multiplexing.
  • the WDM optical transmitter module 1 consists of an LD module 2, an automatic temperature control (ATC) circuit 3, an automatic power control (APC) circuit 4, and an automatic current control (ACC) circuit. 5, and laser diode modulation drive (LD_Drv: Laser Diode Modulation Driver) circuit 6.
  • ATC automatic temperature control
  • API automatic power control
  • ACC automatic current control
  • LD_Drv Laser Diode Modulation Driver
  • the LD module 2 consists of a cooler (TEC: Thermo Electric Cooler) 7 that changes the amount of heat generation and heat absorption depending on the polarity of the supplied current, the LD 8 mounted on the TEC 7, and the light intensity. It consists of a semiconductor photodiode (mPD: monitor Photo Diode) 9 that monitors the temperature and a temperature-sensitive resistor (thermistor) 10 that detects the temperature of the TEC.
  • TEC Thermo Electric Cooler
  • the thermistor 10 detects the temperature of the TEC 7, and the ATC circuit 3 adjusts the current supplied to the TEC 7 based on the temperature detected by the thermistor 10. In other words, by controlling the supply current to the TEC 7 so that the temperature of the TEC 7 becomes constant, the temperature of the LD 8 mounted on the TEC 7 and thermally coupled is kept constant. Thereby, the light wavelength of the LD 8 is kept constant.
  • the light intensity of the LD 8 is controlled by the APC circuit 4 and the AC C circuit 5 so as to be constant.
  • LD_Drv circuit 6 modulates the optical output of LD 8 and outputs an optical signal.
  • the AC C circuit 5 controls the 1 ow level of the light intensity modulation by the LD-DrV circuit 6 by setting the LD bias current near the light emission threshold current.
  • the APC circuit 4 detects the light intensity of the LD 8 by the mPD 9 and controls the LD-DrV circuit 6 so that the light intensity of the LD 8 (average intensity at the time of intensity modulation) becomes constant.
  • the signal waveform may be distorted due to the dispersion or loss of light generated in the optical fiber. To compensate for the optical output waveform quality at the transmission end.
  • the conventional optical transmission module for WDM uses the ATC circuit 3, APC circuit 4, and ACC circuit 5 to keep the set optical output constant regardless of changes in the communication environment.
  • the automatic control is performed as follows. Therefore, when setting the optical output again, an adjustment circuit must be provided and adjustment must be made separately.
  • variable resistor 101 As an adjustment circuit, a variable resistor 101 as shown in the figure is generally used.
  • multiplexing such as 256 wavelength multiplexing and 512 wavelength multiplexing
  • the adoption of a simple and small mounting area variable resistor as the adjustment circuit can reduce the size of the optical transmission module.
  • the conventional optical transmission module employing a variable resistor as an adjustment circuit has two problems as described below.
  • the first problem is that a variable resistor generally requires complicated adjustment, and it is difficult to automate the adjustment.
  • the second problem is that it is difficult to change (re-set) the output of the optical transmission module during the actual operation of the optical transmission module because it is difficult to automate the adjustment of the variable resistor. That is the point.
  • the LD bias current may be determined by adjusting the circuit based on the characteristics of individual circuits (LD module 2, APC circuit 4, ACC circuit 5, LD-Drv circuit 6, etc.) that have been measured in advance.
  • the temperature of the TEC 7, that is, the temperature of the LD 8 is determined by adjusting the ATC circuit 3 while measuring the optical wavelength with an optical wavelength meter or an optical spectrum analyzer.
  • the temperature of the LD 8 may be determined by adjusting the circuit based on the characteristics of the LD module 2 measured in advance.
  • the APC circuit 4, the ACC circuit 5, and the LD-DrV circuit 6 must be readjusted to set the light intensity again.
  • the amount of heat generated by the LD 8 changes because the LD bias current changes this time.
  • LD8 is mounted so as to be at the same temperature as TEC 7, it actually has thermal resistance, so if the amount of heat generated by LD 8 itself changes, the distance between LD 8 and TEC 7 will change. A temperature difference occurs. In this case, the temperature of TEC 7 is kept constant by ATC circuit 3. Even if it is controlled, the light wavelength changes due to the temperature change of the LD 8. Therefore, the ATC circuit 3 must be readjusted.
  • the individual LD modules 2 have large variations in characteristics such as the LD light emission threshold and the LD efficiency, it is difficult to automate the adjustment of the variable resistor, and after all, individual adjustment is required for each optical transmission module.
  • an optical transmitter module that outputs at a specific wavelength is prepared for each transmission channel, but if an optical transmitter module of a certain wavelength fails, it is not necessarily replaced with an optical transmitter module that emits light at the same wavelength. Instead, wavelengths may be rearranged for optical transmission modules that emit light at nearby wavelengths by using the temperature dependence of the LD emission wavelength. In this case, simple adjustment functions such as variable resistors require very troublesome adjustments as in the first problem. For this reason, it is almost impossible to change (re-set) the output of the optical transmission module in actual operation, and almost no change is actually made.
  • the present invention is to solve the first and second problems by automating the adjustment of the light intensity and the light wavelength, and to be able to change the setting of the light output as needed even during actual operation. With the goal. Disclosure of the invention
  • a semiconductor integrated circuit for controlling a laser diode (hereinafter, referred to as an LD control LSI) of the present invention is an LSI chip mounted on an optical transmission module, and includes an automatic temperature control circuit for controlling the temperature of a laser diode, and a laser diode.
  • An automatic current control circuit for controlling the bias current an automatic light intensity control circuit for controlling the light intensity of the laser diode, an automatic temperature control circuit, an automatic current control circuit, And a digital / analog conversion circuit that is arranged at each input stage of the automatic light intensity control circuit and converts digital data input from the outside into an input voltage of each circuit on the same substrate.
  • This LSI is a circuit that adjusts the waveform of an optical signal output by a laser diode, and converts digital data input from the outside into an input voltage of a laser diode modulation drive circuit that modulates the optical signal.
  • a waveform adjusting circuit including a digital / analog conversion circuit may be further provided. This makes it possible to externally digitally control the waveform of the optical signal.
  • a memory for storing a correspondence between a code input to each digital / analog conversion circuit and a light wavelength and a light intensity set by the code, and a correspondence between externally input digital data and the memory in the memory.
  • a code conversion circuit for converting the code based on the above.
  • the input voltage of the waveform adjustment circuit can be automatically set so that the characteristics of the waveform of the optical signal output by the laser diode are as specified.
  • code conversion may be performed by a program instead of a code conversion circuit.
  • a program for converting digital data specifying the light wavelength and light intensity into a code to be input to each digital / analog conversion circuit based on a predetermined association is stored in a rewritable memory. Then, the program stored in the memory is executed by the arithmetic circuit (CPU). This allows light '' When digital data for specifying the wavelength and light intensity is input, the automatic temperature control circuit, automatic current control circuit, and automatic light intensity control circuit are set so that the light wavelength and light intensity of the laser diode are as specified. Automatically sets the input voltage.
  • the program converts the digital data specifying the waveform characteristics of the optical signal output from the laser diode into a code to be input to the digital / analog conversion circuit based on a predetermined correspondence. Automatically sets the input voltage of the waveform adjustment circuit so that the waveform characteristics of the optical signal output by the laser diode are as specified when digital data that specifies the characteristics of the optical signal waveform is input, including You may make it.
  • an analog / digital converter which is arranged at each output stage of an automatic temperature control circuit, an automatic current control circuit and an automatic light intensity control circuit and converts the output voltage of each circuit into digital data.
  • a digital conversion circuit may be further provided.
  • a register for temporarily storing digital data input from the outside may be further provided, and each digital / analog conversion circuit may read out the digital data from the register and convert it.
  • the register is set to an initial value!
  • an optical transmission module of the present invention is an optical transmission module including the above-described semiconductor integrated circuit for controlling a laser diode, a laser diode controlled by the semiconductor integrated circuit for controlling a laser diode, and a laser diode modulation driving circuit.
  • the method of the present invention is a method of setting the optical output of the optical transmission module during the actual operation of the optical transmission module
  • a plurality of predetermined data is input to the optical transmission module, and the optical output of the optical transmission module when the data is input is measured.
  • the correspondence is saved, and during the actual operation of the optical transmission module, the saved correspondence is converted to a desired light output.
  • the optical output of the optical transmission module is set by acquiring corresponding data and inputting the acquired data to the optical transmission module.
  • FIG. 1 is a diagram illustrating an optical transmission module according to a first embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an automatic adjustment system of the optical transmission module.
  • FIG. 3 is a diagram illustrating an optical transmission module according to the second embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an optical transmission module according to a third embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an optical transmission module according to a fourth embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a conventional optical transmission module. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a diagram illustrating an optical transmission module of the present invention and a first embodiment of an LD control: LSI of the present invention mounted on the optical transmission module.
  • the optical transmission module 11 includes an LD module 2, a 0-0 circuit 16 and an LD control LSI 12.
  • the LD module 2 is the same as the LD module of the conventional optical transmission module described in FIG. 6, and includes a TEC 7, an LD 8, an mPD 9, and a thermistor 10 mounted on the TEC 7.
  • the LD-D rv circuit 16 modulates the optical output of the LD 8 and outputs an optical signal, similarly to the LD-D rV circuit 16 of the optical transmission module in FIG.
  • the LD control LSI 12 integrates an ATC circuit 3, an APC circuit 4, and an ACC circuit 5 that have conventionally been configured with individual components, and adds a circuit to enable external digital communication. is there.
  • control 3 I 12 includes ATC circuit 3, APC circuit 4 and ACC circuit 5, serial / parallel conversion circuit 15, register 14, ATC circuit 3, APC circuit 4 and AC C circuit
  • the DAC 13 arranged at each input stage of No. 5 is formed on the same substrate to form one LSI.
  • the ATC circuit 3 controls the temperature of the TEC, the current handled is larger than that of the APC circuit 4 or the ACC circuit 5. Therefore, when three types of circuits are formed on the same substrate, it is necessary to suppress the power loss of the ATC circuit 3 so that the large current does not cause heat generation of the LSI and cause deterioration of characteristics.
  • the ATC circuit is composed of DMOS (Double Diffused M0S), and the BCD (BiCD) process technology, which has been attracting attention in recent years, is used to integrate it with other circuits on a single chip. To solve this problem.
  • DMOS Double Diffused M0S
  • BiCD BiCD
  • the BCD process technology is a process technology for forming a bipolar transistor, a CMOS, and a DMOS (Double Diffused MOS) on a single chip.
  • the input data is converted to parallel data by the serial / parallel conversion circuit 15 and temporarily stored in the register 14.
  • the area to be stored is determined for each of the ATC circuit 3, the APC circuit 4, and the ACC circuit 5, so that it is possible to distinguish which circuit is used for adjusting the signal.
  • the digital data temporarily stored in the register 14 is converted by the DAC 13 into an input voltage to each circuit.
  • I 2 C (known as a protocol for serial communication Use Inter-Integrated-Circuit) or SPI (Serial-Peripheral-Interface).
  • SPI Serial-Peripheral-Interface
  • the serial / parallel conversion circuit 15 may not be provided.
  • the input digital data is directly input to the register 14.
  • the input digital data is temporarily stored in the register 14.
  • three input terminals may be provided so that the input can be directly input to each DAC 13.
  • an approximate initial value is set first, and then automatic adjustment is performed based on the initial value.
  • setting the initial value is not essential, as it is only effective in reducing the adjustment time.
  • LD efficiency characteristics (relationship between emission intensity and bias current), mPD conversion efficiency characteristics (relationship between received light intensity and detection current), and TEC characteristics (heat absorption, heat dissipation, current, and voltage)
  • Basic data such as the relationship
  • thermistor characteristics reference resistance, B constant
  • data such as input / output characteristics is acquired.
  • FIG. 2 is a diagram showing an automatic adjustment system 24 of these circuits.
  • the automatic adjustment system 24 includes an optical transmission module 11 on which an LD control LSI 12 is mounted, and two measuring instruments 18 and 19 for measuring the output of the optical transmission module 11.
  • measuring instrument 18 is a spectrum analyzer for measuring the light wavelength
  • measuring instrument 19 is an oscilloscope for measuring the light intensity.
  • the output of the optical transmission module 11 is transmitted by the optical fiber 21, is branched by the stirrer 22 on the way, and is input to the measuring devices 18 and 19 in parallel.
  • the measuring instruments 18 and 19 and the arithmetic unit 17 are connected by a bus 23, and are commonly used in automatic measurement systems such as RS232C and GP-IB (General Purpose Interface Bus). ) Communication is performed according to the communication protocol.
  • the arithmetic unit 17 and the optical transmission module 11 are connected by a bus 20, and communication is performed according to a communication protocol such as I2C or SPI as described above.
  • the arithmetic unit 17 compares the input desired optical output with the measurement results of the measuring devices 18 and 19, and according to the comparison result, the ATC circuit 3 and the APC circuit 4 of the LD control LSI 12 And a control program for generating data (serial data) for changing the set value of the ACC circuit 5 and providing the data to the optical transmission module 11 is incorporated.
  • the control program first takes in the measured values from the spectrum analyzer 18 and compares them with the desired input light wavelength. Next, the digital code input to DAC 13 for ATC circuit 3 is set to 1 if the measured value is larger than the desired wavelength, and to +1 if the measured value is smaller than the desired wavelength. The operation is performed, and the operation result is written to the register 14 of the LD control LSI 12 shown in FIG. This process is repeated until the value measured by the spectrum analyzer 18 becomes the same as the desired light wavelength.
  • the measured value obtained by the oscilloscope 19 is taken and compared with the desired light intensity. And write to register 14. This process is performed so that the value measured by the oscilloscope 19 is the same as the desired light intensity. Repeat until
  • the automatic adjustment system 24 alternately repeats the adjustment of the light wavelength and the adjustment of the light intensity until the light output of the optical transmission module 11 has a desired light wavelength and a desired light intensity.
  • a circuit for enabling digital communication with the outside is added to the ATC circuit 3, the APC circuit 4, and the ACC circuit 5, and the set value of each circuit is externally set. Since it can be operated, an automatic adjustment system can be easily constructed by combining an arithmetic device such as a personal computer with a measuring instrument. As a result, the adjustment time of the optical transmission module can be shortened, and further, the cost for product inspection can be significantly reduced.
  • the ATC circuit 3, APC circuit 4, AC C circuit 5, and the additional circuits described above are integrated on the same substrate and mounted on the optical transmitter module 11 as one LSI. There is no need to increase the size of the device.
  • the means for automating the adjustment of light intensity and wavelength has been described above.
  • the means for changing the set values of the optical transmission module in actual operation will be described.
  • the above-mentioned control program has a function to save the setting values adjusted so as to obtain the desired light intensity and light wavelength. to add.
  • the set value may be stored in a storage device provided in the arithmetic unit 17 (a hard disk of a personal computer, a nonvolatile memory of a microcomputer IC, or the like).
  • a data table showing the relationship between the light output and the set value of each circuit can be obtained.
  • the setting value of each circuit when the light output is adjusted to obtain an optical output with an intensity of 0 dBm and a wavelength of 155 O nm is stored as data 1
  • the intensity is 1 dBm and the wavelength is
  • the set value of each circuit when adjusted to obtain an optical output of 1550 nm is saved as data 2.
  • several combinations of desired light intensity and wavelength are defined, and the set values of each circuit adjusted by the automatic adjustment system 24 are sequentially stored. Such adjustment is performed for each optical transmission module, and a data table corresponding to each optical transmission module is obtained in advance.
  • the acquired data table is stored and managed by the WDM communication system using the optical transmission module.
  • the system When the administrator of the WDM communication system performs an operation of resetting the optical output to the desired intensity or wavelength for the optical transmission module in operation, the system outputs the desired optical output from the above data table. Find and set a set of set values for each circuit corresponding to.
  • the optical transmission module 25 according to the second embodiment shown in FIG. 3 is different from the LD control LSI 12 according to the first embodiment shown in FIG. A circuit for improving the performance is added. Since the points other than those described below are the same as those in the first embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • the LD control LSI 26 of the present embodiment is provided with an LD_Drv adjustment circuit 30 including a DAC 28 and an output buffer 29 in addition to the circuit configuration of the first embodiment. LD—DrV adjustment circuit 30 is provided for each of the cross point adjustment and the duty ratio adjustment. Further, the register 27 is provided with an area for temporarily storing signals for cross point adjustment and duty ratio adjustment.
  • the digital data for adjusting the crosspoint or the digital data for adjusting the duty ratio which is input from the external system and temporarily stored in the register 27, is converted into an analog signal by the DAC 28, and the output buffer 2 After being held at 9 and input to the LD-DrV circuit 31.
  • the adjustment of the waveform can be performed by the same method as the adjustment of the light wavelength and the intensity, using the automatic adjustment system 24 of FIG.
  • the oscilloscope 19 measures the cross point duty ratio
  • the control program incorporated in the arithmetic unit 17 compares the measured value with the cross point duty ratio of the desired waveform.
  • the digital code input to the LD-D rv adjustment circuit 30 is adjusted based on the comparison result. This process is repeated until the value measured by the oscilloscope 19 becomes a desired light output waveform.
  • the automatic adjustment system 24 adjusts the light wavelength, the light intensity, and the light output waveform until the desired light wavelength, desired light intensity, and desired light output waveform are obtained. , Repeat in order.
  • the settings of each circuit adjusted by the automatic adjustment system 24 for each optical transmission module are defined. If the data table is obtained in advance by storing the set of values in order, the light output can be reset even during the actual operation of the optical transmission module.
  • the LD control LSI 26 and the optical transmission module 25 are capable of correcting the signal waveform distortion caused by light dispersion and loss in addition to the effects shown in the first embodiment, and This has the effect of compensating for the waveform quality of the optical output at the point.
  • the optical transmission module 32 of the third embodiment shown in FIG. 4 stores data representing the relationship between the optical output and the set value of each circuit in the LD control LSI 26 of the second embodiment shown in FIG. A circuit for holding the table itself is added.
  • the WDM communication system manages such a data table in order to realize a change in optical output during actual operation.
  • the optical transmission module itself is used. Manages the data table to realize the same function. It is to be noted that, since it is the same as the second embodiment except for the points described below, the same elements as those in the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • a code conversion circuit 34 is arranged before the register 27 of the LD control LSI 26 of the second embodiment, and the code conversion circuit 34 is used by the code conversion circuit 34.
  • a non-volatile memory 35 for storing a data table to be stored.
  • the non-volatile memory 35 is a rewritable memory that stores a data table (data and code conversion table) that is referred to when the code conversion circuit 34 performs code conversion.
  • the code conversion circuit 34 converts the data of the optical wavelength, light intensity or waveform specified from the outside into the ATC circuit 3, the APC circuit 4, the ACC circuit 5, or the DAC 13 of the LD-DrV adjustment circuit 30. , 28 Convert to the code to be input to 8.
  • the data table and the code conversion program may be stored in the non-volatile memory 35, and an arithmetic unit (CPU) may be arranged in place of the code conversion circuit 34 to execute the program.
  • CPU arithmetic unit
  • the data table held by the non-volatile memory 35 is created by using the automatic adjustment system 24 shown in FIG. 2 as in the first and second embodiments. That is, the control program of the arithmetic unit 17 in FIG. 2 stores and saves the set values adjusted when a desired optical output is obtained, and creates a table from the stored values.
  • the DAC of the ATC circuit 3 becomes "1 1 1 1 1 0 0 0 0 "
  • APC circuit 4 DAC" 0 0 0 0 1 1 1 1 " it is assumed that the desired optical output can be obtained by inputting the code" 0 1 0 1 0 1 0 1 0 1 "to the DAC of the ACC circuit 5.
  • the data table contains The correspondence between the output data (0, 155 0) and the three codes that are the setting values of each circuit is stored in the nonvolatile memory in the optical transmission module. Stored in 3-5.
  • the code conversion circuit 34 operates the data table in the nonvolatile memory 35. , Read the code corresponding to the input data, and set the read code in register 27.
  • the optical transmission module since the optical transmission module itself holds the data table, an instruction value of the optical wavelength, the optical intensity, or the optical output waveform is given from the communication system in which the optical transmission module is incorporated. The light is output as instructed.
  • the communication system does not need to individually manage circuit setting values for optical transmission modules having large variations, but only needs to instruct a desired optical output. This makes it easy not only to change the optical output during the actual operation, but also to flexibly cope with a small degree of dependence on the communication system and a system exchange.
  • the optical transmission module 36 of the fourth embodiment shown in FIG. 5 has a circuit for monitoring the optical output as digital data added to the LD control LSI 33 of the third embodiment shown in FIG. It was done. As a result, everything from setting of the optical output of the optical transmission module to monitoring can be performed in a digital system.
  • the third embodiment is the same as the third embodiment, and therefore, the same elements as those of the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • the LD control LSI 37 is a modification of the ATC circuit 3, APC circuit 4, and ACC circuit 5 of the third embodiment, and further includes an ADC 38 for converting the voltage inside each circuit into digital data, and an ADC 38.
  • a parallel / parallel converter that converts the data digitized by 8 from parallel data to serial data.
  • the serial conversion circuit 39 is added.
  • the parallel / serial conversion circuit 39 similar to the serial / parallel conversion circuit 15, is provided on the assumption that serial data is exchanged with an external system. Therefore, it is not necessary to exchange parallel data with an external system.
  • the ATC circuit 40 of the present embodiment has a monitor terminal that converts the resistance value of the thermistor 10 into voltage information and outputs the information.
  • the emission wavelength of the LD 8 depends on the temperature of the TEC 7. Therefore, the temperature of the TEC 7 detected as the resistance value of the thermistor 10 is output as voltage information (analog signal) from the monitor terminal of the ATC circuit 40, and is converted into digital data by the ADC 38.
  • the optical wavelength of the LD 8 can be monitored as digital data.
  • APC circuit 41 of the present embodiment has a monitor terminal that converts the output current of mPD 9 into voltage information and outputs the same.
  • the light intensity of the LD 8 can be obtained from the output current of the mPD 9 and the mPD conversion efficiency. Therefore, the output current of the mPD 9 is output as voltage information (analog signal) from the monitor terminal of the APC circuit 41, and is converted into digital data by the ADC 38. As a result, the light intensity of the LD 8 can be monitored as digital data.
  • the LD bias current for controlling the light intensity is also monitored as digital data.
  • To detect the LD bias current insert a resistor with a known resistance into the current path (not shown), and provide a monitor terminal in the circuit 42 that detects and outputs the voltage effect generated by the resistor. This is achieved by: If the output signal from the monitor terminal of the ACC circuit 42 is converted into digital data by the ADC 38, the LD bias current can be monitored as digital data.
  • the optical output can be monitored as digital data, the state of the optical output can be confirmed without using a measuring instrument such as a spectrum analyzer or an oscilloscope. Therefore, a communication system incorporating this optical transmission module can constantly monitor the optical output of the optical transmission module without connecting special measuring equipment, and In the event of a change in light output due to anomalies, aging, or environmental changes, it is possible to respond quickly and appropriately.
  • the registers 14 and 27 are given initial values in advance. This is to stably operate the optical transmission module even when power is turned on or when data from the WDM communication system has not been input.
  • a control circuit for an object with bipolar characteristics uses the central value of the input (zero if the input is positive or negative) and the central value of the characteristic to be controlled. (In the case of TEC, heat is not generated or absorbed.) Generally, control is performed. If the value of the above register is a zero code, the input voltage of the ATC circuit controlling TEC becomes the minimum value or the maximum value. In other words, the ATC circuit is set to generate the maximum heat or the maximum heat of the TEC, so that the optical transmission module is overloaded.
  • the TEC does not generate or absorb heat even when the power is turned on or when data from the host system is not input. Can be operated stably.
  • the semiconductor integrated circuit for controlling a laser diode of the present invention and the optical transmission module equipped with the semiconductor integrated circuit are configured such that the input voltage of each circuit for controlling the optical output of the laser diode is controlled by digital data input from the outside. It is designed to be operable.
  • the optical output can be easily adjusted by a digital method, and the optical output adjustment can be automated by combining it with a computing device.This reduces the time and labor required for adjusting the optical output. it can. In addition, since the basic functions required for laser diode control are integrated on a single chip, the design of the optical transmission module is facilitated.
  • the semiconductor integrated circuit for laser diode control and the optical transmission module of the present invention can automatically adjust the light intensity and the light wavelength, and can change the setting of the light output as needed even during the actual operation. It is suitable for use in any WDM communication system that requires such operation.

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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
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Abstract

Dans un module de transmission optique pour communication à multiplexage en longueur d'onde (WDM), l'intensité lumineuse et la longueur d'onde de la lumière peuvent être ajustées automatiquement, et les réglages peuvent être changés en cas de besoin même en cours de fonctionnement. Un circuit LSI est utilisé, dans lequel un convertisseur numérique-analogique (13) permettant la communication numérique avec l'extérieur est ajouté à chacun des circuits ATC (3), APC (4) et ACC (5), lesdits circuits étant intégrés sur le même substrat. Un module de transmission optique intégrant cette puce est connecté à un ordinateur personnel ou à un appareil de mesure, et des données numériques sont fournies aux fins d'un ajustement automatique. Une table de données représentant les relations entre les données d'entrée et les sorties optiques relatives à une pluralité de modules de transmission optique, est obtenue préalablement par exécution des ajustements automatiques. Lors du fonctionnement réel, le réglage de la sortie optique est modifié par référence à la table de données obtenues.
PCT/JP2003/000370 2002-01-30 2003-01-17 Circuit integre a semi-conducteurs de commande de diode laser, module de transmission optique et procede de reglage de sortie optique WO2003065524A1 (fr)

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JP2002021954A JP2003224326A (ja) 2002-01-30 2002-01-30 レーザダイオード制御用半導体集積回路および光送信モジュールならびに光出力設定方法
JP2002-21954 2002-01-30

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WO2003065524A1 true WO2003065524A1 (fr) 2003-08-07

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WO2019216150A1 (fr) * 2018-05-09 2019-11-14 三菱電機株式会社 Système de réglage et d'inspection de module de transmission de lumière, procédé de réglage et d'inspection de module de transmission de lumière, et procédé de fabrication de module de transmission de lumière

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JP2006049674A (ja) * 2004-08-06 2006-02-16 Nippon Telegr & Teleph Corp <Ntt> 光通信用光源部、並びにその制御方法
EP2043208B1 (fr) * 2005-03-16 2011-05-25 Nippon Telegraph and Telephone Corporation Unité à source lumineuse de communication optique et procédé de surveillance et de contrôle de la longueur d'onde
JP2007309840A (ja) * 2006-05-19 2007-11-29 Olympus Corp 光源装置及び分析装置
JP2010103293A (ja) * 2008-10-23 2010-05-06 Nec Corp 光送信器
JP5127677B2 (ja) * 2008-11-25 2013-01-23 新光電気工業株式会社 光源制御回路および直接露光装置
CN104319622A (zh) * 2014-11-19 2015-01-28 天津光电通信技术有限公司 小型化连续光输出激光器驱动电路

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JPH05211364A (ja) * 1992-01-30 1993-08-20 Mitsubishi Rayon Co Ltd レーザダイオードの光出力制御回路
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EP1109335A2 (fr) * 1999-12-15 2001-06-20 Lucent Technologies Inc. Procédé pour assurer la correct sélection de canal dans un système de control de longeur d'onde stabilisé

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106953694A (zh) * 2017-01-17 2017-07-14 中航光电科技股份有限公司 一种机载小型化射频光发射机
WO2019216150A1 (fr) * 2018-05-09 2019-11-14 三菱電機株式会社 Système de réglage et d'inspection de module de transmission de lumière, procédé de réglage et d'inspection de module de transmission de lumière, et procédé de fabrication de module de transmission de lumière

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