Avalanche photodiode (APD) module LLAM-1550-R2AH

Product Overview
The LLAM-1550-R2AH is a high-speed, low-light analog avalanche photodiode (APD) receiver module based on a 1550 nm InGaAs APD. The module integrates a thermoelectric cooler and a preamplifier, and provides a 50 MHz bandwidth for reliable detection of fast analog signals.

Series Description
The LLAM series combines an avalanche photodiode chip, thermoelectric (TE) cooling and a preamplifier inside a hermetically sealed modified 12-lead TO-66 flange package. The compact, single-package design is RoHS-compliant and includes provision for additional heat sinking. Integrated TE cooling stabilizes responsivity and reduces noise across a 5°C to 40°C ambient temperature range.

APD
This model includes the Excelitas C30662EH InGaAs APD optimized for 1550 nm detection.

Applications

• Laser range finding
• Target recognition
• Distributed temperature sensing (DTS)
• Confocal microscopy
• Analytical instrumentation
• High-speed free-space optical communication

Performance / Noise
Typical noise equivalent power: 150–180 fW/√Hz at 1300 nm; 130–160 fW/√Hz at 1550 nm.

Technical Specifications

• Model: LLAM-1550-R2AH
• Detector type: InGaAs avalanche photodiode (APD), includes Excelitas C30662EH
• Nominal wavelength: 1550 nm
• Active area / fiber diameter: 200 µm
• Package: modified 12-lead TO-66 flange, hermetically sealed
• Thermal control: integrated thermoelectric (TE) cooler
• Preamplifier: integrated preamplifier included
• Bandwidth: 50 MHz
• Noise (typical): 150–180 fW/√Hz at 1300 nm; 130–160 fW/√Hz at 1550 nm
• Operating ambient behavior: TE cooler ensures lower noise and stable responsivity from 5°C to 40°C
• Compliance: RoHS-compliant