20 GHz Photodiode, Module (PD-20-M)

Data Sheet

Product Overview

The Optilab PD-20-M is a 20 GHz photodiode module designed for RF over Fiber, antenna remoting, and broadband RF transmission applications using single mode optical. The PD-20-M can accept input power of up to 35 mW. The PD-20-M utilizes a high input power, low distortion PIN photodiode that provides optical to RF conversion out to the frequency range beyond 20 GHz. This compact, cost-effective receiver module can provide users with status monitoring through the use of an on-board processor that communicates to a host computer over an RS-232 I/O interface via a standard USB 2.0 port. When the PD-20-M RF over fiber receiver module is linked with the LT series of RF over fiber transmitter modules, the combination provides an excellent solution for ultra-wideband RF to fiber conversion applications.


  • Wideband RF Transmission over Fiber
  • RF/IF Signal Distribution
  • Satcom Microwave Antenna Signal Distribution
  • EW Systems
  • Broadband Delay-line and Signal Processing
  • LIDAR Receivers
  • Phased and Interferometric Array Antenna


  • Ultra-wide Bandwidth up to 20 GHz
  • High Dynamic Range
  • High Input Power Handling Capacity of 35 mW
  • Highly Linear for Analog Signals Transmission
  • No TIA for intrinsic phase Linearity
  • Status Monitoring: RS-232 (standard)
  • Power and Remote Monitoring via USB Port

Feature Name Description
General Specifications
Photodiode Wavelength Range 1260 nm to 1600 nm
Operational Bandwidth 60 KHz to 20 GHz
Optical Input Level 35 mW max.
Repsonsitivity 0.85 A/W @ 1550 nm typ. 0.90 A/W @ 1310 nm typ. 0.40 A/W @ 850 nm typ.
S21 3 dB Bandwidth 17 GHz min., 19 GHz typ.
S22 Characteristics < -10 dB @ 20 GHz
Optical Return Loss -30.0 dB typ.
2nd Harmonics Distortion -70.0 dBc max.
3rd Harmonics Distortion -75.0 dBc max.
Optical PDL @ 1550 nm 0.05 dB max.
Output Coupling AC Coupled
RF Impedence 50 Ω
Ripple over Bandwidth ±1.0 dB max.
Link Performance with LT-20
SFDR 113 dB Hz2/3
Link Loss -20 dB @ 10 dBm optical
Mechanical Specifications
Operating Temperature -10º C to +50º C
Storage Temperature -20º C to +80º C
Power Supply Requirements +5 V DC, 500 mA max.
Optical Connector FC/APC, SC/APC Optional
RF Input Connector K Connector Female, 50 Ω
DC Connector Plug-in typ.
Local Alarm LED: Optional Input Power
Remote Alarms RS-232 Interface (Standard) via USB
Dimensions 82 mm x 56 mm x 25 mm
Accessories Included 110 V - 240 V AC USB Adaptor & Cable
Housing Precision Mach. Anodized Aluminum

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