Transcript 슬라이드 1
InGaAs avalanche photodiode (LAMDA-P) School of Mechatronics Gwangju Institute of Science and Technology [1] 3D Micromanufacturing Lab. Introduction of InGaAs APD The APD (avalanche photodiode) is a high sensitivity photodiode that operates at high speeds and high gain by applying a reverse bias. Delivers a higher S/N than PIN photodiodes and is widely used in optical rangefinders, spatial light transmission, scintillation detectors, etc. The G8931-04 is an InGaAs APD that delivers a high-speed response of 2.5 Gbps required for trunk line optical fiber communications such as SONET (synchronous optical network), G-PON (gigabit-capable passive optical network) and GE-PON (gigabit ethernet-passive optical network). School of Mechatronics Gwangju Institute of Science and Technology [2] 3D Micromanufacturing Lab. Introduction of APD module This product is a highly sensitive high-speed photo-detector that integrates an avalanche photodiode (hereafter abbreviated APD), a temperature-compensating bias circuit and low noise current-to voltage amplifier circuit. The temperature-compensating bias circuit has a thermo-sensor that detects the ambient temperature to offset the temperature dependence of the APD gain. It also provides a low ripple bias voltage which is applied to the APD. The low noise current-to-voltage amplifier circuit uses a low noise operational amplifier, providing a low noise circuit configuration optimized for the APD signal readout. The combination of this amplifier circuit and the low ripple bias circuit enables high-speed light detection with high sensitivity. In addition, only external DC voltage (±12V) is necessary as power supply, so the module is easy to operate. School of Mechatronics Gwangju Institute of Science and Technology [3] 3D Micromanufacturing Lab. Introduction of NI-DAQ The NI USB-6008 provides low- cost, bus- powered multifunction DAQ functionality for applications such as simple data logging, portable measurements, and academic lab experiments. Use the USB-6008 with the included ready-to-run data logger software to begin taking basic measurements in minutes, or program it using NI LabVIEW or C and the included NI-DAQmx Base measurement services software for a custom measurement system. • 8 analog inputs at 12 or 14 bits, up to 48 kS/s • 2 analog outputs (12-bit, 150 S/s); 12 digital I/O; 32-bit counter • Bus-powered for high mobility; built-in signal connectivity PC-based Data Acquisition • Each NI USB-6008 requires: Compatible with LabVIEW, LabWindows™/CVI, and Measurement Studio for Visual Studio .NET School of Mechatronics Gwangju Institute of Science and Technology [4] 3D Micromanufacturing Lab. Specifications (G8931-04) School of Mechatronics Gwangju Institute of Science and Technology [5] 3D Micromanufacturing Lab. Specifications (C5460-2279(X)) School of Mechatronics Gwangju Institute of Science and Technology [6] 3D Micromanufacturing Lab. Specifications (USB-6008) Analog Inputs Numbers 8 SE / 4 DI Sample Rate 10 kS/s Input Resolution 11 bits SE / 12 bits DI Input Voltage Range (analog) SI (Single-ended) ±10 V Differential ±20, ±10, ±5, ±4, ±2.5, ±2, ±1.25, ±1 V Analog Outputs Numbers 2 Output Resolution 12 bits Maximum Update Rate 150 Hz, software-timed Output Voltage Range 0 to +5 V Dimensions 8.18 cm × 8.51 cm × 2.31 cm School of Mechatronics Gwangju Institute of Science and Technology [7] 3D Micromanufacturing Lab. APD module operation method 1. Power Cable and Output Signal Cable Connections. ① Power connection: Use the power cable to connect the C5460-2279(X) to the power supply. ② Signal cable: Use a coaxial cable for connection to measuring devices such as oscilloscopes. Be sure to terminate the output with 10 kΩ to 1MΩ. 2. Turn the Power On: After the power is turned on, check whether excessive current is flowing the device and whether the device is operating abnormally, for example if smoke is coming out. If any abnormal operation occurs, immediately power off. 3. After optical adjustment has been made, start measurement. School of Mechatronics Gwangju Institute of Science and Technology [8] 3D Micromanufacturing Lab. Circuit and data of APD module School of Mechatronics Gwangju Institute of Science and Technology [9] 3D Micromanufacturing Lab. APD control with NI-DAQ School of Mechatronics Gwangju Institute of Science and Technology [10] 3D Micromanufacturing Lab. Composition of NI-DAQ (USB-6008) School of Mechatronics Gwangju Institute of Science and Technology [11] 3D Micromanufacturing Lab. Connection NI-DAQ with APD APD module is connected to GND and AI 0 (AI 0+) of NI-DAQ (USB-6008) by using BNC cable to collect the data from APD sensor. School of Mechatronics Gwangju Institute of Science and Technology [12] 3D Micromanufacturing Lab. Lab VIEW program for APD module 1. After installing Lab VIEW program, operate “Voltage - Continuous Input(LV12).vi” file. School of Mechatronics Gwangju Institute of Science and Technology [13] 3D Micromanufacturing Lab. Lab VIEW program for APD module cont. 2. After operating the program, select the channel of NI-DAQ connected the APD module. The connected channel is “6008/ai0”. School of Mechatronics Gwangju Institute of Science and Technology [14] 3D Micromanufacturing Lab. Lab VIEW program for APD module cont. 3. Set the max./min. voltage (±12 V). Power supply should also send ±12 V to APD module. School of Mechatronics Gwangju Institute of Science and Technology [15] 3D Micromanufacturing Lab. Lab VIEW program for APD module cont. 4. Before running the program, place to save the measured data should be defined as following steps. Firstly select “Log and Read” and open the folder. Then select the designated folder and write the file name. Finally press “OK” button to save the storage path and run the program. School of Mechatronics Gwangju Institute of Science and Technology [16] 3D Micromanufacturing Lab. Measurement of the laser signal If the laser is not emitted, the noise signal is represented as shown in under figure. School of Mechatronics Gwangju Institute of Science and Technology [17] 3D Micromanufacturing Lab. Measurement of the laser signal cont. If the laser is emitted, the voltage signal is increased. The signal is defined by the laser power and scattering. School of Mechatronics Gwangju Institute of Science and Technology [18] 3D Micromanufacturing Lab.