Variable-optical-delay apparatus

Optical waveguides – With optical coupler – Particular coupling function

Reexamination Certificate

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Details

C385S001000

Reexamination Certificate

active

06987904

ABSTRACT:
A variable-optical-delay apparatus with a single wavelength converter and optical loop path has an optical modulator able to adjust the delay time according to the input optical signal. The variable-optical-delay apparatus has an optical input section and an optical output section, an optical filter and a wavelength shifter able to adjust an amount by which a wavelength of an input optical signal is shifted disposed on an optical path extending from the input section to the output section. The input optical signal is output from the output section after passing the wavelength shifter a number of times that is determined according to the input optical signal. A resonant type optical modulator can be used that is set between filters, or set between a filter and a reflector. Part of an optical path from the input section to the output section is in the form of an optical loop, an optical modulator is provided on the optical loop.

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