Professor

■ Ph.D. Physics-Fiber optics, Brown University, 1994.

• Thesis : "Spectroscopic studies of rare earth doped fibers and their applications in optical amplifiers, fiber lasers and gas  sensors" under the supervision of Prof. T. F. Morse, in Division of Engineering, Brown  University

■ M.S.: Engineering, Brown University, 1991.

■ M.S.: Physics-Solid state physics, Seoul National University, 1988.

■ B.S.: Physics, Seoul National University, 1986.

• 2018.9~Present, Director, Yonsei Physics Education and Research Institute

• 2009. 9 ~ Present, Professor, Institute of Physics and Applied Physics, Yonsei University, South Korea.

• 2006. 9 ~ 2009. 8, Associate professor, Institute of Physics and Applied Physics, Yonsei University, South Korea.

• 2005.10 ~ 2006. 8, Professor, Department of Information and Communications, GIST, South Korea.

• 2000.10 ~ 2005. 9, Associate  professor, Department of information and communications, GIST, South Korea.

• 2004. 6 ~ 2004. 9, 2004.12 ~ 2005. 2, Alexander von Humboldt Research Fellow, Institute for Physical High Technology, Fraunhofer Institute, Jena, Germany.

• 2004. 1 ~ 2004. 3, JSPS Invitation Fellow, doing research in fiber sensor and sensor system, Department of Electrical Engineering, The university of Tokyo, Japan.

• 2003. 7 ~ 2003. 8, Chevening Scholar, collaborating  on fiber lasers, Optoelectonics Research Center, University of Southampton, UK.

• 2003. 1 ~ 2003. 2, Visiting Professor, collaborating on fiber devices Institute of Electro-Optic, Engineering, National Chia Tung University, Hsinchu, Taiwan, REpublic of China.

• 2002. 7 ~ 2002. 8, Visiting Scientist, doing research on hollow optical fiber, Fiber Optic Material Research Program, Rutgers University, NJ, USA.

• 2000. 9 ~ 2002. 2, Visiting Scientist and Consultant, doing research on specialty fibers, Optical Fiber Research Department, Bell Labs, Lucent Technologies, Murray Hill, NJ, USA.

• 2001. 1 ~ 2003. 6, Consultant, Optical Components, Samyang Corpration, South Korea.

• 1996 ~ 1998, Consultant, Specialty optical fiber, Samsung Electronics, South Korea.

• 1998. 7 ~ 1998. 8, Visiting Assistant Professor of Research, Division of Engineering, Brown University, RT, USA.

• 1996. 3 ~ 2000. 9, Assistant professor, Department of information and communications, GIST, South Korea.

• 1994.10 ~ 1996. 2, Senior researcher, Fiber and optical communication research center, LG Cable (a former joint venture of AT&T), South Korea.

• 1994. 6 ~ 1994. 9, Post-doctoral research associate, Laboratory for lightwave technology, Brown University, USA.

• 1991. 6 ~ 1994. 5, Research assistant, Laboratory for Lightwave Technology, Brown University, USA.

• 1989. 9 ~ 1991. 5, Teaching Assistant, Physics Department, Brown University, USA.

• 1988. 8 ~ 1989. 2, Second Lieutenant, Korean Army, South Korea.

• 1986. 3 ~ 1988. 2, Teaching Assistant, Department of Physics, Seoul National University, South Korea.

▶ Topical Editor, Optics Letters, Current Optics and Photonics

▶ Associate Editor, IEEE Photonics Technology Letters, Optical Fiber Technology.

▶ Editorial Board Member, Optics Communications.

▶ Executive Editor, Current Applied Physics, Elsevier.

▶Editor in Chief, Journal of the Optical Society of Korea

▶Specialty Editor in Chief, Journal of the Optical Society of Korea

• OSA Fellow, Optical Society of America (Presently The Optica) , USA, 2013.

• High-End Foreign Expert, Huazhong University of Science and Technology, China, 2016.

• Tan Chin Tuan Exchange Fellow, College of Engineering, Nanyang Technological University, Singapore, 2015

• Visiting Scholar, Erasmus Mundus M.Sc. Program, Optics in Science & Technology (OpSciTech), Institute of Applied Physics, Friedrich-Schiller University, Jena, Germany, 2010

• Alexander von Humboldt Research Fellow, Germany, 2004.

• Chevening Scholar, Foreign and Commonwealth Office, UK, 2003.

• JSPS Invitation Fellow, Japan Society for the Promotion of Science, Japan, 2003.

• Achievement award, Minister of Science and Technology, South Korea, 2003.

• Sudang Fellow, Sudang Foundation Scholarship, Korea, 2002.

• Excellence award for research, GIST, South Korea, 2000.

• Excellecne Award for large Preform Process Development, LG Cable, South Korea, 1995.

• The Korean Honor Scholarship, Korean Embassy in US, South Korea, 1991.

• The Korean Government Scholarship, Korean Ministry of Education, South Korea, 1989.

• The Korean Government Scholarship, Korean Ministry of Education, South Korea, 1989.

• Cum Laude, Seoul National University, South Korea, 1986.

  ■ Development of hollow optical fiber technology for novel photonic device applications

A unique design of a hollow fiber with a ring core has been proposed and experimentally demonstrated, for the first time, which could find various optical applications such as mode converters, dispersion compensators, tunable filters, and novel fiber lasers. Three invited talks have been given for HOF applications in international conferences, such as annual meetings of OSA, IEEE-LEOS, and OFS, Invited paper was published in OSA/IEEE Journal of Lightwave Technology, Feb. 2005. Patents filed.

  ■ Initiation of micro optical waveguide (MOW) on micro actuating platform (MAP) technology-

Novel tenability in micro optical waveguide systems has been realized, for the first time, in fiber couplers mounted on micro actuating platform. Utilizing acousto-optic, elasto-optic effects, versatile tuning mechanism has been invented to realized to result in flexible control of optical power splitting, wavelength selectivity, and polarization extinction. Invited paper was published in OSA/IEEE Journal of Lightwave Technology, Feb.2005. Patents filed.

 ■ Hybrid Polymer-silica fiber image processing system

Micro-and sub/micron scale control of the radius of curvature of a liquid polymer surface was achieved on the silica fiber tip, for the first time. Various optical image processing elements, such as diffractive elements, collimator, and tight beam focusing elements were fabricated using the technology. Surface relief grating on azo-polymer showed two dimensional diffractive elements on the fiber ends. Hybrid polymer-fiber lens systems were successfully applied in high density opto-electronic packaging.

  ■ Waveguide based color image optical engine-

Full color synthesis was achieved using a multi-port fiber optic combiner and SMD type LEDs, for the first time. Red, green, and blue LEDs was efficiently coupled to hard plastic clad fiber coupler and the output covered the entire CIE 1931 Chromaticity diagram. Integrated optical engine in conjunction with MEMS ships could open a new avenue of imaging optical engine for micro-projection display.

  ■ Initiation of research on synthesis of radiative transition cross section of rare earth ions in novel optical waveguides-

Controllable and built-in filtering functions were demonstrated in Er doped fiber amplifiers, for the first time, by proposing a Sm doped inner cladding ring. The concept of evanescent wave interaction between the emission from the core and the absorption at the cladding ring could provide inherent methods to synthesize gain spectra, opening applications in gain flattening, gain shaping, for both optical amplifiers and lasers. The fiber laser project was funded by Asian Office of Aerospace Research and Development (AOARD), Air Force, USA, as a first Korean researcher. Patents filed.

 ■ Development of doping process for active fiber devices, and fiber laser sources

Various techniques have been developed in order to dope novel material for applications in nonlinear fiber devices. Development of long wavelength silica fiber laser based Er-Tm energy transfer was, for the first time, achieved opening applications in compact LIDAR and gas sensors. Er-Tm ASE source was developed for broadband applications. Athermal EDFA and high temperature operating fiber gratings have been invented using this technique. Two US patents have been filed along with collaborators in Bell Labs, Lucent Technologies.

• K. Oh, U.C. Ryu, S. T. Kim, and U.C. Paek, “Spectral control of optical gain in a rare earth doped optical fiber using a novel inner cladding structure,” Optical Fiber Technology: Materials, Device, and Systems, Elsevier, vol. 12, No.4, pp.297-304, October, 2006.

• K. Oh, S. Choi, Y. Jung, and Jhang. W. Lee, “Novel hollow optical fibers and their applications in photonic devices for optical communications,” OSA/IEEE Journal of Lightwave Technologies, vol. 23, no.2, pp.524-532, Feb. 2005.

• K. Oh, W. Shin, Y. S. Jeong, Jhang W. Lee, “Development of micro-optical waveguide on micro-actuating platform technologies for reconfigurable optical networking,” OSA/IEEE Journal of Lightwave Technologies, vol. 23, no.2, pp. 533-532, Feb. 2005.

• H. S. Seo, K. Oh, and U. C. Paek, “Gain optimization of germanosilicate fiber Raman amplifier and its application in compensation of Raman-induced crosstalk,” IEEE Journal of Quantum Electronics, vol. 37, no. 9, pp.1110-1116, 2001.