Semiconductor optical waveguide type switch including light cont

Details Semiconductor optical waveguide type switch including light cont Semiconductor optical waveguide type switch including light cont

1992-12-21

1994-07-12

Healy, Brian

Optical waveguides

With optical coupler

Particular coupling structure

385 39, 385 40, 385 14, 385 2, 385131, 385132, 385 16, G02B 626

Patent

active

053296010

ABSTRACT:
A semiconductor waveguide type all-optical switch of a simple structure which can switch at high speed with low switching energy. A waveguide is formed within a core layer made of a semiconductor for absorbing controlling light when an electric field is applied, and a pair of electrodes are formed for applying a voltage to a waveguide part where a refractive index change is to be caused. The controlling light together with controlled light is entered in the waveguide. When a voltage is applied, Franz-Keldysh effect causes the wavelength at the optical absorption spectrum edge in the refractive index change part to shift to the long wavelength side. If light of a wavelength satisfying a predetermined condition is used as the controlling light, the controlling light is absorbed only in the refractive index change part for changing the refractive index in the part, thus the controlled light is switched. Preferably, a p-i-n structure is adopted.

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