ILX Lightwave FOS-79710

ILX Lightwave FOS-79710 Fiber Optic Switch Module
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Manual Datasheet


The FOS-79710 Fiber Optic Switch Module is designed for high return loss, low insertion loss, and excellent stability. Transparent to signal formats and bandwidths, this optically passive fiber optic switch is bi-directional in operation and offers a choice of timed, random, sequential or triggered switching modes.

In the FOM-7900B System Mainframe, the front panel or GPIB-accessible command set controls the FOS-79710 Fiber Optic Switch Module. A single channel input can go to any of the 4 outputs via the FOM-7900B control panel. A "blocking" position switches the input to a zero-reflection terminaton. The user can define and initiate sequential switching through an external trigger, or by defining a switch interval time.


  • Low insertion loss
  • Return loss better than 55 dB
  • Excellent repeatability
  • High channel isolation



Configuration 1 x 4
Wavelength Range 1280 - 1650 nm
Fiber Type 9/125, SMF 28
Connector Type FC/APC
Insertion Loss Typical 1.2 dB, Maximum 1.7 dB
Crosstalk <-80 dB
Polarization Dependent Loss <0.05 dB (at 1550 nm)
Repeatability <0.03 dB
Switching Time 16 ms/channel +300 ms (maximum)
Maximum Continuous Input Power +24 dBm
Return Loss >55 dB