By Cox III C.H.
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Additional resources for Analog optical links
The larger core makes for more efficient fiber to device coupling than is possible with single mode fiber. However, the multiple modes travel different paths and consequently have different propagation times through the fiber. e. different propagation velocities for the different modes. 55 m. Consequently for all high performance applications, single mode fiber is the choice and it will be assumed throughout this book, unless noted otherwise. Although the light from lasers is linearly polarized, standard single mode fibers do not maintain the polarization of the guided light.
Consequently this light is lost via scattering into the surrounding substrate. Therefore as the electrode voltage increases, the intensity in the output waveguide decreases. For a sufficiently high voltage, the light in the two arms becomes exactly 180 degrees out of phase at the output combiner. Under this bias condition, ideally all the light in the output waveguide attempts to propagate in higher order modes and none propagates in the fundamental mode. Consequently no light reaches the output fiber.
As the voltage on the electrodes is increased, the resulting electric field alters the refractive index, which in turn changes the effective coupling length, thereby permitting some of the optical power in the input guide to stay in that guide to the output. For a sufficiently high electrode voltage, all the optical power in the incident waveguide will, ideally, remain in that guide to the output. The voltage needed to go from full coupling to zero coupling is called the switching voltage, VS .