Multimode Optical Fiber Shutter
All-fiber multimode shutters for 800nm and 1300nm

_FEATURES _APPLICATIONS
____•  Non-invasive ____•  Optical overload protection
____•  Low insertion loss ____•  Warm-up protection
____•  High optical power handling ____•  Optical power safety
____•  High isolation ____•  Receivers
____•  High return loss ____•  Integrated modules

Phoenix Photonics miniature multimode optical fiber shutter is designed to meet the optical circuit protection needs of multimode fiber LAN and sensor systems. It uses All-Fiber Evanescent Field technology to provide excellent optical isolation in the ‘Off’ condition while allowing minimal impact on signal quality for the ‘On’ state. Since the technology is non-invasive, i.e. the signal path is not interrupted, near zero Back Reflections are assured. Simple to operate the device provides a low cost, small footprint shutter option in 800nm and 1300nm systems.

EVANESCENT FIELD TECHNOLOGY

Phoenix utilizes evanescent field technology to produce low loss, high performance, non-invasive components. Shutters are produced by replacing the cladding in the locally processed region of the fiber with a material with a refractive index, which can be modified thermally. By applying a current the device switches between guiding and non-guiding conditions, which means no absorbers are required, facilitating high power operation.

_SPECIFICATION
Units
Min.
Typical
Max.
Wavelength
nm
800nm & 1300nm
Insertion Loss – ‘on’
dB
 
0.5
1.0
Maximum insertion loss (biased)
dB
-
50
n/a
Isolation – ‘off’
dB
40
n/a
n/a
Return Loss
dB
n/a
>70
n/a
Input Optical Power
dBm
n/a
n/a
25
Switch ‘off’ (IL – 40dB) @700C
ms
n/a
500
1000
Switch ‘on’ (40dB – IL) @-50C
ms
n/a
600
1000
Heater resistance
Ω
n/a
40
n/a
Heater current
mA
n/a
n/a
80
Electrical Power
mW
 
250
320
Operating Temperature Range
ºC
- 5
n/a
70
Storage Temperature
ºC
- 40
n/a
85
Fiber Type
Corning 62.5/125
Input & Output Fiber Lengths
mm
n/a
1000
n/a

SWITCHING CHARACTERISTICS:
The evanescent field shutter requires a bias current to reach the switching region dependent on the environmental temperature. Switch-on (closed to open) is slowest at minimum temperature, whilst switch-off (open to closed) is slowest at maximum temperature. Times specified above are to open the shutter from 0mA to minimum attenuation and to close the shutter from minimum insertion loss to maximum attenuation under worst-case conditions. Actual switching times can be much faster.


Download spec sheet as a pdf file

U6 Vulcan House, Restmor Way, Wallington, Surrey SM6 7AH UK
T: +44 (0)20 8405 4339 F: +44 (0)20 8763 9820
E: sales@phoenixphotonics.com