Ultra fabrication-tolerant fully packaged micro-optical polarization diversity hybrid

• Published in: Journal of lightwave technology 1995-10, Vol.13 (10), p.1985-1991
• Main Authors: Pennings, E.C.M., Schouten, D., Khoe, G.-d., van Gils, R.A.J.C.M., Depovere, G.F.G.
• Format: Article
• Language: English
• Subjects: Applied sciences; Assembly; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Extinction ratio; Glass; Insertion loss; Integrated optics. Optical fibers and wave guides; Loss measurement; Optical and optoelectronic circuits; Optical device fabrication; Optical fiber losses; Optical fiber polarization; Packaging; Wavelength measurement
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/50.469738

We report on a novel fully packaged micro-optical polarization diversity hybrid, which shows excellent performance in combination with large fabrication and assembly tolerances. Our novel design employs highly parallel glass plates, which results in parallel and equidistant input and output beams. Critical fabrication and alignment procedures are thus avoided. At the target wavelength of 1.55 /spl mu/m, typical fiber-to-fiber insertion loss is 0.7 dB, balancing is 50/spl plusmn/3%, polarization extinction ratios are better than 25 dB, and measured optical back reflection is smaller than -58 dB. Wavelength insensitive behavior has been observed, resulting in a wide usable spectral operating range in excess of 90 nm. The micro-optical hybrid has been successfully tested in a dual-balanced polarization-diversity coherent CPFSK transmission experiment at 2.5 Gbt/s.< >