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Proceedings Paper

High efficient coupling between wedged-shaped fiber and planar lightwave circuit chip using gradient refractive-index media
Author(s): Xu Liu; Shuting Qu; Jinbiao Xiao; Xiaohan Sun
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Paper Abstract

Planar lightwave circuit (PLC) chips based on III-V semiconductor MQW rib waveguide promise to be not only a solution to information access, but also direct the issues of bandwidth, pin count, reliability and complexity. Nanopositioning and precision alignment addresses vital importance in high-efficient connectivity between PLC chips and fiber arrays. Refractive-index mismatching between fused silica and III-V compound is one of the most serious problem which remains unsolved on one hand as well as mode field mismatching which can be mitigated in other hand through gradient geometry structure such as tapered spot size converter (SSC) and specialty fibers such as wedge-shaped fiber (WSF). Spherical gradient refractive-index (SGRIN) media intervened between WSF and MQW rib waveguide is put forward. The GRIN media virtually eliminates the reflection losses associated with the fused silica-air interface and III-V semiconductor-air interface. The beam spot emitted from WSF are observed by digital camera and the fundamental mode of MQW rib waveguide was calculated out. Lightwave propagation and mode field evolution in the WSF-SGRIN-PLC system is simulated by FDTD method with the coupling loss of 8.54dB at a wavelength of 1.55μm. An LED signal is injected into WSF, transmitted along GRIN media and PLC waveguide and output through single mode fiber (SMF). Optical power meter-based measurement verifies the whole system coupling loss to be consistent with the numeric estimation. The approach provides an experimental prototype for coupling and packaging technique of integrated photonic devices, hence supplying foundation for photonic network.

Paper Details

Date Published: 2 October 2006
PDF: 9 pages
Proc. SPIE 6389, Active and Passive Optical Components for Communications VI, 638910 (2 October 2006); doi: 10.1117/12.685936
Show Author Affiliations
Xu Liu, Southeast Univ. (China)
Shuting Qu, Southeast Univ. (China)
Jinbiao Xiao, Southeast Univ. (China)
Xiaohan Sun, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 6389:
Active and Passive Optical Components for Communications VI
Achyut K. Dutta; Yasutake Ohishi; Niloy K. Dutta; Jesper Moerk, Editor(s)

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