IEEE Photonic Society UCSB Invited Speaker Prof Wood-Hi Cheng "The Art and Science of Packaging High-Coupling Photonics Devices and Modules"

Tue, 2013-02-05 14:00 - 16:00
Speaker Topics: 
The Art and Science of Packaging High-Coupling Photonics Devices and Modules

ABSTRACT: A new scheme of hyperboloid microlens (HM) employing automatic grinding and precise fusing techniques to achieve high-average and high-yield coupling efficiency from high-power 980-nm lasers into single mode fibers is proposed and demonstrated. The fiber endface of the HM exhibited a double-variable curvature in the major and minor axes which was characterized as a hyperboloid. By selecting half transverse length of the hyperbola and using fusing process to precise and quantitative controlling the required minor radius of curvature within 2.4 - 2.8 m and offset within 0.8 m, the HMs exhibited a high-average coupling efficiency of 83%. This study demonstrates that the proposed HMs through both automatic grinding and precise fusing techniques can achieve high-average and high-yield coupling efficiency better than any other grinding techniques to form asymmetric microlenses for utilizing in many low-cost lightwave interconnection applications. From art (or engineering) point of view, we are able to fabricate any kinds of perfect fiber microlenses.

Mode (spot size and phasefront) mismatch between the laser diodes and single-mode fibers (SMFs) can lead to a significant insertion loss. A direct near-field phase and intensity measurement in diode lasers, SMFs, and HMs is demonstrated by employing a SMF interferometer. From science point of view, detailed understanding of the near-field phase and intensity distributions of light sources and optical components are essential for designs of microoptics with better mode matching to minimize the insertion loss.

 

BIOGRAPHY:  Wood-Hi Cheng received the Ph.D. degree in physics from Oklahoma State University, Stillwater, in 1978. He is a Chair Professor at National Sun Yat-sen University, Kaoshiung, Taiwan, where he founded and became the Director of the Institute of Electro-Optical Engineering (1994-2000), and Dean of College Engineering (2002-2005). In 2007 he chaired the Southern Taiwan Opto-Electronics Center of Excellence. He was a Program Director of Optoelectronics in the National Science Council (2009-2011) of Taiwan providing research grants and direction.

Professor Cheng’s research and development is contributions to photonic package technology, including high-speed laser module packaging, high-coupling devices and modules packaging employing automated process, passively mode-locked fiber lasers employing carbon nanotubes or graphene, high-reliability glass-doped phosphor-converted high-power white-light-emitting diodes, and 300-nm ultrabroadband Cr-doped fiber amplifiers. Prof. Cheng’s most significant R&D is the demonstration of record ultra-broadband 300-nm Cr-doped fibers (CDFs). The CDFs have been used for the first time as a broadband Cr-doped fiber amplifier (CDFA) for use in a 40-Gb/s error-floor free data fiber-optic transmission.

Prof. Cheng is a Fellow of IEEE, OSA, and SPIE.  He served as a Chair for the IEEE Photonics Society, Taipei Chapter, during 1999–2000, and served as a Chair for the OSA, Taipei Chapter during 2005–2006. He was recipient of the IEEE Photonics Engineering Achievement Award in 2010 for his contributions to design, development and commercialization compact solid-state laser modules, and the 2011-2013 IEEE Photonics Society Distinguished Lecturer Award.

ABSTRACT: A new scheme of hyperboloid microlens (HM) employing automatic grinding and precise fusing techniques to achieve high-average and high-yield coupling efficiency from high-power 980-nm lasers into single mode fibers is proposed and demonstrated. The fiber endface of the HM exhibited a double-variable curvature in the major and minor axes which was characterized as a hyperboloid. By selecting half transverse length of the hyperbola and using fusing process to precise and quantitative controlling the required minor radius of curvature within 2.4 - 2.8 m and offset within 0.8 m, the HMs exhibited a high-average coupling efficiency of 83%. This study demonstrates that the proposed HMs through both automatic grinding and precise fusing techniques can achieve high-average and high-yield coupling efficiency better than any other grinding techniques to form asymmetric microlenses for utilizing in many low-cost lightwave interconnection applications. From art (or engineering) point of view, we are able to fabricate any kinds of perfect fiber microlenses.

 

Mode (spot size and phasefront) mismatch between the laser diodes and single-mode fibers (SMFs) can lead to a significant insertion loss. A direct near-field phase and intensity measurement in diode lasers, SMFs, and HMs is demonstrated by employing a SMF interferometer. From science point of view, detailed understanding of the near-field phase and intensity distributions of light sources and optical components are essential for designs of microoptics with better mode matching to minimize the insertion loss.