Patent ID: 7130121

Claim:
An integrated output module for an EDFA for amplifying optical signals, said integrated output module comprising a sleeve having a longitudinal capillary channel holding ends of a first optical fiber section and a second optical fiber section; a walk-off birefringent crystal plate proximate said ends of said first optical fiber section and a second optical fiber section; a collimating lens proximate said walk-off birefringent crystal plate; a half-wave plate between said walk-off birefringent crystal plate and said collimating lens, a Faraday rotator plate proximate said collimating lens and opposite said half-wave plate; a first filter proximate said Faraday rotator, said first filter reflecting nearly all incident light; a wavelength-dependent filter proximate said first filter, said wavelength-dependent filter passing optical signals and reflecting pump laser light; and a photodiode proximate said wavelength-dependent filter, said photodiode monitoring the power of optical signals passed by said wavelength-dependent; wherein said ends of said optical fiber sections, said walk-off birefringent crystal plate, said collimating lens, said half-wave plate, said Faraday rotator plate, and said first filter are arranged and oriented with respect to each other so that optical signals from said end of said first optical fiber section end is reflected and focused on said end of said second optical fiber section, but optical signals from said end of said second optical fiber section is not reflected and focused on said end of said first optical fiber section.