Patent ID: 7292754

Claim:
An apparatus comprising: a body; having an optical input; and an optical output; a wavelength division multiplexer positioned within the body and optically connected to the optical input and the optical output; a first optical leg, having a first reflector, positioned within the body and optically connected to the wavelength division multiplexer, a second optical leg, having a second reflector, positioned within the body and optically connected to the wavelength division multiplexer; and a third optical leg, having a third reflector, positioned within the body and optically connected to the optical input and the optical output wherein a light entering the optical input of the body is split into a first light portion entering the wavelength division multiplexer and a second light portion entering the third optical leg, the first light portion entering the wavelength division multiplexer is further split into a third light portion entering the first optical leg and a fourth light portion entering the second optical leg, the fourth light portion having a different wavelength than the third light portion, the third light portion entering the first optical leg is reflected by the first reflector back through the wavelength division multiplexer as a reflected third light portion, the fourth light portion entering the second optical leg is reflected by the second reflector back through the wavelength division multiplexer as a reflected fourth light portion and is combined with the third reflected light to form a reflected first light portion, the second light portion entering the third optical leg is reflected by the third reflector as a second reflected second light portion, the reflected first light portion and the reflected second light portion being combined and exiting the body at the optical output.