The **M5TS-85-R/Q** is a high-performance **Super-Luminescent Light Emitting Diode (SLED)** module, typically utilized in high-precision optical sensing and telecommunications fiber testing. It is engineered to provide a high-power, broadband light source that mimics the spatial coherence of a laser but maintains the temporal incoherence of an LED. --- ### 1. Key Technical Specifications Below are the primary electronic and optical characteristics typically associated with the M5TS series: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Center Wavelength** | 850 (± 20) | nm | | **Spectral Width (FWHM)** | 15 - 35 | nm | | **Output Power** | 2 - 10 (Configuration dependent) | mW | | **Forward Current ($I_f$)** | 100 - 150 | mA | | **Forward Voltage ($V_f$)** | 1.8 - 2.5 | V | | **Operating Temperature** | -20 to +70 | °C | --- ### 2. Internal Component Architecture The "R/Q" designation usually refers to the internal monitoring and stabilization circuitry. The module typically includes: * **SLED Chip:** The core semiconductor that emits the broadband light. * **Monitor Photodiode (MPD):** Integrated to sense the back-facet light intensity. This allows for an **Automatic Power Control (APC)** loop to keep the output stable regardless of temperature fluctuations. * **Thermistor:** A Negative Temperature Coefficient (NTC) resistor used to monitor the internal temperature of the chip. * **Thermoelectric Cooler (TEC):** (Common in 'Q' or high-stability variants) Used to actively cool or heat the chip to maintain a constant wavelength and power output. --- ### 3. Pinout & Electrical Connection (General) While specific pinouts vary by package type (e.g., Butterfly or TO-can), the standard configuration follows this logic: ```markdown Pin 1: TEC (+) Pin 2: Thermistor Pin 3: Monitor PD Anode Pin 4: Monitor PD Cathode Pin 5: Thermistor Pin 6: SLED Anode (+) Pin 7: SLED Cathode (-) Pin 8: TEC (-) ``` --- ### 4. Applications The M5TS-85-R/Q is primarily used in the following electronic systems: 1. **Optical Coherence Tomography (OCT):** For high-resolution medical imaging. 2. **Fiber Optic Gyroscopes (FOG):** Providing a stable light source that reduces "noise" caused by backscattering. 3. **Optical Time Domain Reflectometers (OTDR):** Used for testing short-range fiber networks. 4. **Spectral Analysis:** Providing a wide-spectrum light source for chemical or material sensing. ---