Patent ID: 7092162

Claim:
A system for increasing the bandwidth of an optical device characterized by a pass band with a predetermined center frequency, comprising: an optical cavity having an optical path length that produces an output channel with a free-spectral range and an insertion loss that is maximum in magnitude at a frequency substantially within said pass band; and a second optical cavity having an optical path length that produces a second output channel with a free-spectral range with an insertion loss that is maximum in magnitude at a frequency substantially within said pass band of the optical device; wherein said output channel of the optical cavity is aligned along an optical path of the optical device; said optical cavity is defined by two plates, each plate has an inner surface and an outer surface, the inner surfaces of the plates are parallel to one another, the outer surfaces of the plates are not parallel to one another, and neither outer surface is parallel to the inner surfaces; and the second optical cavity is combined with the optical device such that said second output channel of the second optical cavity is aligned along said optical path of the optical device.