The **LU980N-R** is a high-performance, high-reliability laser diode module. It is primarily used in telecommunications (as a pump laser for EDFA) and in scientific research applications. --- ### 1. Core Technical Specifications The LU980N-R is designed to operate in the 980nm wavelength band, providing the energy required to excite Erbium ions in fiber amplifiers. | Parameter | Specification (Typical) | | :--- | :--- | | **Operating Wavelength** | 970 nm - 985 nm | | **Output Power** | 300mW - 600mW (model dependent) | | **Operating Current** | 500mA - 1000mA | | **Forward Voltage** | 1.8V - 2.2V | | **Package Type** | 14-pin Butterfly Package | | **Fiber Type** | Polarization Maintaining (PM) Fiber | --- ### 2. Internal Electronic Components The "R" in the series often refers to the inclusion of specific internal components that allow for closed-loop control and thermal stabilization. * **Laser Diode Chip:** The GaAs (Gallium Arsenide) semiconductor material that generates the coherent light. * **Thermoelectric Cooler (TEC):** An internal Peltier device that moves heat away from the laser chip to ensure wavelength stability and prevent thermal runaway. * **Thermistor:** A 10kΩ NTC resistor used to monitor the internal temperature of the module. * **Monitor Photodiode (MPD):** A photodetector that measures back-facet light to provide a feedback loop for Constant Optical Power (APC) mode. --- ### 3. Pinout Configuration (Standard 14-Pin Butterfly) The electronics are accessed through a gold-plated 14-pin lead frame. | Pin | Function | Pin | Function | | :--- | :--- | :--- | :--- | | 1 | TEC (+) | 8 | No Connection | | 2 | Thermistor | 9 | No Connection | | 3 | Monitor PD Anode (-) | 10 | Laser Anode (+) | | 4 | Monitor PD Cathode (+) | 11 | Laser Cathode (-) | | 5 | Thermistor | 12 | No Connection | | 6 | No Connection | 13 | Case Ground | | 7 | No Connection | 14 | TEC (-) | --- ### 4. Implementation Requirements To drive the LU980N-R safely, the following electronic subsystems are required: 1. **Constant Current Source:** Must have low noise and transient protection (Schottky diodes/snubbers) to prevent damaging the laser facet. 2. **Temperature Controller:** A PID loop controller connected to the internal TEC and Thermistor to keep the chip at a constant 25°C. 3. **Safety Interlocks:** ESD protection is critical; the LU980N-R is extremely sensitive to static discharge.