The **LU974N-R** is a specific model of a **High-Power Laser Diode**, typically manufactured by companies like **Lumentum** (formerly JDSU). It is engineered for high reliability and efficiency, primarily used as a pump source for Erbium-Doped Fiber Amplifiers (EDFA) in telecommunications. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and optical characteristics of the LU974N-R: | Feature | Specification (Typical) | | :--- | :--- | | **Operating Wavelength** | 974 nm (Infrared) | | **Output Power** | 200mW to 600mW (varies by sub-model) | | **Package Type** | 14-pin Butterfly Package | | **Fiber Type** | Polarization Maintaining Fiber (PMF) | | **Integrated Components** | Thermoelectric Cooler (TEC), Thermistor, Monitor Photodiode | | **Operating Current** | ~500mA - 1000mA (model dependent) | --- ### 2. Internal Electronic Components The "Butterfly Package" is not just the laser chip; it contains several critical electronic sub-parts: * **Laser Diode Chip:** The semiconductor engine that converts electrical current into 974nm light. * **Thermoelectric Cooler (TEC):** An internal Peltier device used to maintain a constant temperature for the laser chip. This ensures wavelength stability and longevity. * **Thermistor:** A temperature-sensitive resistor used by an external controller to monitor the internal heat and provide feedback to the TEC. * **Monitor Photodiode (MPD):** A sensor that measures the back-facet light output to provide a feedback loop for Constant Optical Power (COP) mode. * **Fiber Bragg Grating (FBG):** Often included in the fiber pigtail to "lock" the wavelength, preventing it from shifting due to temperature or current changes. --- ### 3. Pinout Configuration (Standard 14-Pin Butterfly) The standard wiring for this class of electronic part usually follows this logic: | Pin # | Function | Description | | :--- | :--- | :--- | | 1 | TEC (+) | Positive terminal for cooling/heating | | 2 | Thermistor | Temperature sensor terminal 1 | | 3 | PD Anode | Photodiode Anode (Monitor) | | 4 | PD Cathode | Photodiode Cathode (Monitor) | | 5 | Thermistor | Temperature sensor terminal 2 | | 11 | LD Cathode | Laser Diode Negative | | 12 | LD Anode | Laser Diode Positive | | 14 | TEC (-) | Negative terminal for cooling/heating | --- ### 4. Applications The LU974N-R is a critical component in the following systems: 1. **Optical Amplification:** Pumping Erbium-Doped Fiber Amplifiers (EDFA). 2. **Fiber Lasers:** Serving as a seed or pump source for larger fiber laser systems. 3. **Instrumentation:** Precision measurement and medical diagnostic equipment requiring stable 974nm light. ---