The **D-H4M113N-R** is a specific part number primarily associated with **InGaAs (Indium Gallium Arsenide) PIN Photodiodes**, often manufactured by companies like Sumitomo Electric or similar optical component specialists. These are critical components in fiber-optic communication systems. --- ### Technical Specifications The following table outlines the typical electrical and optical characteristics for this series of components: | Parameter | Specification (Typical) | Description | | :--- | :--- | :--- | | **Active Area** | Φ30 μm - Φ80 μm | The light-sensitive diameter of the chip. | | **Wavelength Range** | 1100 nm to 1650 nm | Optimized for O, E, S, C, and L bands. | | **Responsivity** | 0.85 - 0.95 A/W | Efficiency of converting optical power to current. | | **Dark Current** | < 1.0 nA | Leakage current when no light is present. | | **Capacitance** | 0.4 - 0.7 pF | Determines the speed/bandwidth of the diode. | | **Package Type** | TO-46 or Receptacle | Often housed in a metal can or connectorized unit. | --- ### Key Electronic Functions 1. **Optical-to-Electrical Conversion**: It acts as the "eye" of a receiver, converting incoming photons from a fiber optic cable into a proportional electrical current (photocurrent). 2. **High-Speed Response**: Due to low junction capacitance, these parts are designed for high-bitrate data transmission (typically up to 2.5 Gbps or 10 Gbps depending on the specific sub-variant). 3. **Low Noise**: The InGaAs material provides a high signal-to-noise ratio compared to silicon at infrared wavelengths. ### Common Applications * **Fiber to the Home (FTTH)**: Used in Optical Network Units (ONUs). * **RoF (Radio over Fiber)**: Signal distribution for wireless networks. * **LAN/WAN**: High-speed data communication backbones. * **Test Equipment**: Power meters and optical fault finders. --- ### PIN Configuration (Typical TO-Can) ```text [Top View] (3) / \ (2) O (1) \ / ----- (1) Anode (Signal) (2) Cathode (Bias/Case) (3) Case Ground (Optional) ```