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Switching mechanism of an all-optical switch using pulsed gating

A versatile optically gated optical switch using an organic dye is suitable for light-path switching in an optical communication device for various wavelengths of the signal light. We have developed two types of all-optical switch, i.e., a coaxial configuration and a different-axis configuration. The coaxial configuration exhibits a faster response (∼80 µs) than the different-axis configuration (∼3 ms). Here, the response time of the signal light (1310 nm) is analyzed as a function of both the gating power (pulse height) and pulse width of the gating light (980 nm). The heating and propagation processes in a tiny area around the focal point of both the signal light and the gating light are discussed.