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(miniature Variable Optical Attenuator, coaxial design)

The mVOA comes in a hermetically sealed package with a diameter of only 3.5 mm. It's manufactured with the latest techniques in laser welding for achieving better stability and improved reliability.

This ultra small VOA is ideally suited for gain control in amplifiers and transceivers.

1 • 3.5 mm diameter • Telecom
2 • Laser welded package • Instrumentation
3 • Reliable • Test and Measurement
4 • 0-6.5V • Medical
5 • RoHS compliant • Sensor Network

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Sercalo's fiber optic Variable Optical Attenuator is based on an electrostatic MEMS mirror. A voltage between 0-6.5 V on the drive pin sets the optical attenuation. When power is removed the VOA returns into its default state.

There are 2 variants available with different default states: The normally open (bright) type or high attenuation (dark) type. The dark variant has better linearity and is used in applications where the light is cut at power off.

The MEMS component is hermetically sealed. The part is designed to conform to Telcordia 1221 reliability standards. No epoxy is present in the optical path. The optical collimator is assembled using laser welding techniques which results in long term stability and excellent reliability. The component withstands rugged environments. It can directly be mounted on printed circuit boards. The component is compliant to ROHS requirements 2015/863/EU.

Sercalo’s COAXIAL TYPE VOA is non latching and returns to the default position at power-off, i.e. the bright variant returns to the minimum insertion loss position, whereas the dark variant returns to the high attenuation state (I.e it is blocking the light at power off). The VOA works over the wavelength range of the fiber, but wavelength dependent loss is specified within one single band (50 nm).

The VOA is also available for specialty fiber at 650, 750, 850 and 980 µm. Also variants with Polarisation Maintaining fibers are available.


Ultra small VOA for single mode fiber

Optical Specifications
Wavelength range1 (SMF 28 Ultra type) nm 1250   1670
Insertion loss2 @ min. attenuation  dB   0.5 1.0
Max. attenuation 3  dB 30 40  
Wavelength d. Loss @ 10 dB (C Band) dB   0.1  
Wavelength d. Loss @ 20 dB (C Band) dB   0.3  
Polarisation d. Loss @ 10 dB dB   0.10  
Polarisation d. Loss @ 20 dB  dB   0.10  
Return loss  db 50 55  
Switching time (linear scale) ms   0.5 2
Cycle Rate Hz   50 100
Durability cycles No wear out
Electrical specifications
Operation voltage V   5.0 6.7
ESD protection V 500    
Pins Nb     2
Operation Temperature °C -100   70
Storage Temperature °C -40   85
Pigtail lenght cm 50   100
Weight g 2.5
Dimensions diameter x Length mm 3.5 x 14 on 4.2 mm header
RoHS Compliance 2015/863/EU (no exceptions)

1 Insertion loss is for SMF28 Ultra fiber
2 Values for standard range at 25°C, without connectors. For Dark Variant minimum IL is reached at 6.5 V.
3 For Bright variant the max. attenuation is reached at 5 V. For dark variant max. attenuation is > 40 dB at 0 V.

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