PSM-002 Miniature Polarization Scrambler Module

Miniature polarization scrambler module that generates discrete random polarization states at a user-selectable rate of 0.01 to 20,000 points/s.

Operating wavelength: 1260 to 1650 nm and 980 to 1310 nm standard
Output degree of polarization (DOP): < 5%, 2.5% typical
Scrambling rate: User selectable from 0.01 to 20,000 points/s
Insertion loss: < 0.05 dB (without connectors), < 0.6 dB (with connectors)

Datasheet

Overview

The PSM-002 is a miniature polarization scrambler module that generates discrete, random states of polarization (SOP) at a user-controllable rate between 0.01 and 20,000 points/s. The states are distributed for uniform coverage of the Poincaré sphere. The module uses a patented fiber squeezer polarization controller to randomize the polarization state.

The scrambling rate is selected via an RS-232 command. The scrambling function can also be enabled and disabled by a TTL signal, and in external trigger mode the module generates one random SOP for each TTL pulse received, allowing synchronization with other equipment in the system.

The PSM-002 is designed for integration into sensor and communication systems, including those operating in extreme environmental conditions. It is available as a standard board for lab applications or fully enclosed in a watertight enclosure for high-humidity environments, and in standard or extended operating temperature versions.

Key Features

User-selectable scrambling rates from 0.01 to 20,000 points/s
Rate selection via RS-232 command
Scrambling enabled and disabled by a TTL trigger signal
External trigger mode generating one random SOP per TTL pulse
Works in extreme environmental conditions
Low insertion loss, return loss, PDL and PMD
Low residual phase and amplitude modulation
Compact size
Available as a board or in a watertight enclosure
Standard or extended temperature versions

Specifications

Optical

Operating wavelength	1260 to 1650 nm and 980 to 1310 nm standard Two versions; standard calibrated wavelengths are 1550 nm (1260-1650 nm version) and 1310 nm (980-1310 nm version), others available
Output degree of polarization (DOP)	< 5%, 2.5% typical 4000 point average
Scrambling rate	User selectable from 0.01 to 20,000 points/s
Insertion loss	< 0.05 dB (without connectors), < 0.6 dB (with connectors) For SMF-28 compatible fiber; other fibers may have higher loss, especially with connectors
Average PMD	< 0.05 ps
Intrinsic PDL	< 0.05 dB, 0.01 dB typical Excluding connectors
Return loss	> 65 dB (without connectors)
Optical power handling	> 300 mW

Electrical and Interfaces

Power supply	5.0–5.5 VDC / 9 W max.
Power consumption	0.5–9 watts Depending on the scrambling rate
Control interface	RS-232 (TXD, RXD) 10-pin connector; pins 3 and 4 map to pins 2 and 3 on a DB9 connector
External trigger	One random SOP for each TTL pulse received Triggers on 5V to 0V falling edge
Enable/disable	5μs width TTL pulse Scrambler toggles on falling edge (5V to 0V) of pulse

Environmental

Operating temperature ST	0 to 65°C
Operating temperature ET	-35 to 70 °C
Storage temperature	-40 to 85 °C

Physical

Dimensions 0	96 (L) x 63.5 (W) x 18 (H) mm Board version
Dimensions E	115 (L) x 82.6 (W) x 19 (H) mm Enclosure version

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Sensor and communication systems
Polarization sensitivity elimination
PMD emulation
PMD monitoring for PMD compensation
PDL measurement
Optical device test and characterization
Manufacturing test of fiber optic assemblies
OEM modules for fiber optic sensing

Options & Accessories

Option	Description
01	Wavelength range 1260 - 1650 nm
02	Wavelength range 980 - 1310 nm
0	Without enclosure — Board version
E	With enclosure — Watertight enclosure for high-humidity environments
FC/PC	FC/PC connectors
FC/APC	FC/APC connectors
SC/PC	SC/PC connectors
SC/APC	SC/APC connectors
NC	No connectors
ST	Standard temperature range — Operating temperature 0 to 65°C
ET	Extended temperature range — Operating temperature -35 to 70 °C