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Polarization-independent semiconductor optical amplifier module using twin graded-index rod lenses

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Abstract

Recent reductions in polarization sensitivity have again made semiconductor optical amplifiers (SOA’s) attractive for fiber-optic communications.1–3 Another key issue of SOA’s is packaging with highly efficient and stable optical coupling to single-mode fibers. There are several reports on packaged SOA modules.4,5 However, these modules showed high polarization sensitivity owing to chip characteristics. Optical coupling efficiency differ between polarization-insensitive and -sensitive devices, because the waveguide parameters are different. In this paper, we demonstrate a SOA module with polarization sensitivity as low as 1 dB at a 17-dB fiber-to-fiber gain.

© 1991 Optical Society of America

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