Dynamic gain equalization arrangement for optical signals

Details Dynamic gain equalization arrangement for optical signals Dynamic gain equalization arrangement for optical signals

2005-05-10

2005-05-10

Frech, Karl D. (Department: 2876)

Optical waveguides

Accessories

Attenuator

C385S015000, C385S024000

Reexamination Certificate

active

06892021

ABSTRACT:
An optical dynamic gain equalization filter (DGEF) comprises a planar arrangement of preferably “perfectly sampled” (or alternatively oversampled) waveguide grating routers (WGR's) connected by individual optical paths each containing a Mach-Zehnder interferometer operated in a push-pull fashion so that a positive phase change in one interferometer arm and a corresponding negative phase change in the other interferometer arm produces a desired change in attenuation while, at the same time, the overall phase of the optical signals after passing through the Mach-Zehnder interferometer is kept constant with respect to the adjacent paths. Alternatively, the above-described arrangement is effectively “cut in half”, and its size effectively also reduced accordingly, using a mirror placed at the midpoint of the device and an appropriate circulator to separate the input and output optical signals.

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