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Silicon Diode with Pigtail

A silicon diode with a pigtail is a Si PIN photodiode integrated with a fiber optic cable for efficient light detection and signal conversion.

Overview

A silicon photodiode with a pigtail combines a silicon PIN photodiode with a pre-attached optical fiber, allowing direct coupling of light into the detector. This configuration is widely used in optical communications, high-speed photometry, and monitoring applications because it converts optical power into an electrical current with high efficiency and low noise .

Key Features

  • Spectral Range: Typically sensitive from 200 nm to 1100 nm, covering ultraviolet, visible, and near-infrared light . Specific models may target narrower ranges, e.g., 320–1000 nm for multimode fibers or 610–970 nm for single-mode fibers .
  • High Responsivity: Optimized for low-light detection with high sensitivity and low dark current .
  • Low Capacitance: Ensures fast response times, suitable for pulsed or continuous-wave light sources .
  • Fiber Coupling: Available with single-mode or multimode fibers, actively aligned for maximum coupling efficiency and minimal back reflection .
  • Package Options: Offered in TO metal packages, ceramic, or custom receptacle packages, with pigtail fibers terminated in standard connectors like FC/PC or angle-polished connectors .

Applications

  • Optical Communications: High-speed receivers in LAN, MAN, and WAN systems .
  • Precision Photometry: Measurement of light intensity and spectral analysis .
  • Analytical Instrumentation: Non-contact temperature measurement, colorimetry, and medical diagnostics .
  • Fiber-Coupled Interferometry: Single-mode fibers reduce multipath interference for accurate signal detection .

Customization

Many manufacturers offer custom pigtail lengths, fiber types, and photodiode active areas to meet specific application requirements. Some devices integrate transimpedance amplifiers (TIA) for all-in-one signal conversion and amplification .

Summary

A silicon diode with a pigtail is a versatile, high-performance photodetector that combines the sensitivity of a silicon PIN diode with the convenience of fiber optic coupling. It is ideal for applications requiring precise, low-noise optical detection and fast response times across a broad spectral range .

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