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Semiconductor optical amplifier array coupled to uncoated flat-end fibers with integrated beam expanders and TiO/sub 2/ antireflection coatings

1997; IEEE Photonics Society; Volume: 3; Issue: 6 Linguagem: Inglês

10.1109/2944.658797

1558-4542

Chih-Hsiao Chen, S. Shunk, U. Koren, M. Chien, B.I. Miller, K.F. Dreyer, H. M. Presby, Robert G. Ahrens,

Advanced Photonic Communication Systems

We present a novel coupling scheme consisting of an integrated beam expander, a specifically tailored TiO/sub 2/ antireflection coating, optical index matching gel, and uncoated flat-end single-mode fiber (SMF). This scheme was used to package four-channel semiconductor optical amplifier arrays. Far-field profiles for each discrete amplifier in the array are typically 80 and 150 FWHM, perpendicular and parallel to the junction plane, respectively. The TiO/sub 2/ AR coating overcomes the indices mismatching of fiber glass and InP based device, and reduce optical reflection to 0.002% at 1.55 /spl mu/m. Misalignment tolerance in the l-dB excess loss range, for a discrete channel, is typically 5 /spl mu/m vertically and 8 /spl mu/m laterally. The average coupling loss is 4.3 dB per facet for the devices measured. Fiber coupled small signal gain for the amplifiers is typically 11.6 dB and a saturation output power of 3.0 dBm. The method of characterization and optimization of the TiO/sub 2/ coating is discussed.