The **LPD-13P1-R/Q** is a high-performance **Photo Diode (PD)** module, typically integrated with a **Transimpedance Amplifier (TIA)**. It is designed for high-speed fiber optic communication systems, specifically for converting optical signals into electrical signals in the long-wavelength range. --- ### ## Technical Specifications The following table outlines the key electrical and optical characteristics of the LPD-13P1-R/Q series: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Wavelength Range** | 1100 to 1650 | nm | | **Responsivity** | 0.85 - 0.95 | A/W | | **Data Rate** | Up to 1.25 / 2.5 | Gbps | | **Supply Voltage (Vcc)** | 3.3 | V | | **Package Type** | TO-46 Can / Pigtail | - | | **Operating Temp** | -40 to +85 | °C | --- ### ### Core Electronic Components 1. **InGaAs PIN Photodiode:** The "heart" of the component. It uses Indium Gallium Arsenide (InGaAs) material because it is highly sensitive to the 1310nm and 1550nm wavelengths used in fiber optics. It converts incident photons into a minute electrical current. 2. **Integrated TIA (Transimpedance Amplifier):** Because the current generated by the photodiode is extremely small, an internal TIA is used to convert that current into a differential voltage signal. This reduces noise interference before the signal leaves the metal housing. 3. **Optical Interface:** Usually features a **Receptacle (R)** or a **Pigtail (Q)** fiber interface. The "R" in the part number often signifies a Receptacle type (like an SC or LC connector housing). 4. **Capacitance/Filter Circuitry:** Internal decoupling capacitors are often included to stabilize the power supply and filter out high-frequency noise from the Vcc line. --- ### ### Typical Application Circuit In a standard receiver circuit, the pins are generally assigned as follows: ```mermaid graph LR A[Fiber Input] --> B(LPD-13P1) B --> C[Vcc - 3.3V] B --> D[GND] B --> E[Data + Out] B --> F[Data - Out] ``` `