SpeckleFree MMS-201 Multimode Scrambler for Multimode Fiber Speckle Reduction

All-fiber multimode scrambler that randomizes laser speckle patterns at 150 kHz for uniform time-averaged core illumination.

Wavelength range: 530-1630nm
Scrambling efficiency: >80% (effective power)
Flatness: <20% typical
Ripple: <10% typical

Datasheet

Overview

The MMS-201 Multimode Scrambler, part of the General Photonics SpeckleFree line now offered by Luna, randomizes laser speckle patterns in multimode fiber so that the time-averaged core illumination is more uniform. The product has been discontinued; the Miniature Multimode Scrambler (MMS-003) is the listed replacement.

Speckle patterns from a multimode fiber can cause problems in applications that require uniform, stable light distributions at the fiber output. The MMS-201 randomizes multimode speckle patterns over time at a frequency of about 150 kHz, so the output light distribution appears uniform and stationary to cameras or detectors with averaging times greater than 80 ms. Its all-fiber optical path keeps insertion loss low, and the internal fiber gets a special surface treatment to prevent breakage under stress.

Operation

The module runs on a +24 V DC supply through a 3-pin front-panel connector. Scrambling starts as soon as power is applied. A rear-panel BNC input accepts a TTL signal to enable or disable scrambling without removing power, and front-panel LEDs show power and scrambling status. Input and output fiber pigtails are on the front panel. Four corner mounting holes on the bottom take 6-32 screws.

Key Features

High speed
High efficiency
Low insertion loss
Compact
Reliable
All-fiber optical path
Scrambling frequency over 150 kHz
TTL enable/disable control via rear-panel BNC input
Power and scrambling status indicator LEDs
Can be made with custom fiber

Specifications

Optical

Wavelength range	530-1630nm
Scrambling efficiency	>80% (effective power) Measured over 80 ms integration time at 635 nm; defined as (light energy ≥ 80% of maximum intensity/total energy)*(area over which intensity is ≥ 80% of maximum intensity/total core area)
Flatness	<20% typical Measured over 80 ms at 635 nm; (max - min intensity) as % of max intensity over the center 80% of the fiber core area
Ripple	<10% typical Measured over 80 ms at 635 nm; max peak-to-valley intensity fluctuation as % of max intensity within the center 80% of the fiber core area
Scrambling frequency	150±5 kHz
Insertion loss	≤1 dB at 635nm, including connectors User guide gives maximum insertion loss at 635nm as 1.0 dB including connectors
Return loss PC connector	>50 dB (with PC connector)
Return loss APC connector	>55 dB (with APC connector)
Optical power handling	400 mW

Fiber

Fiber type	50/125µm step index MM fiber
Fiber core diameter	50 µm (step index)
Fiber NA	0.2 Page and datasheet state 0.2; user guide states 0.22
Connector type	FC/APC or FC/PC
Pigtail length	1 m each side 3mm protective jacketing

Electrical

Power supply	+24VDC/1.5A
Power supply voltage	24±2V
Current consumption	0.75A typical, 1A maximum
Drive voltage	50-65 V peak-to-peak
Enable/disable signal	TTL high = enabled, TTL low = disabled Rear-panel BNC input; open/no input = enabled
Power connector	Molex 0436450300 3 Position Rectangular Housing Connector Receptacle Mating connector Molex 0436400301

Physical and Environmental

Operating temperature	10 to 40°C
Storage temperature	−20 to 70°C
Operating humidity	20 to 80% RH (non-condensing)
Operating pressure	Atmospheric
Dimensions	23 (L) x 10.5 (W) x 6.5 (H) cm
Weight	1.1 kg