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Widely-tunable Picosecond Optical Parametric Oscillator Using Highly-nonlinear Dispersion-shifted Fiber

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Seminar Details
Presenter Name: 
Prof. Kenneth Wong
Faculty Supervisor(s): 
Shuo.Tang
Date: 
Tuesday, August 11, 2009 - 4:00pm
Location: 
Kaiser 2020
Seminar Abstract: 

Picosecond optical pulse sources have been playing an important role in ultrafast processes such as optical communications and biomedical imaging applications. Today there is a growing demand of short pulse generation in non-conventional wavelength bands, for example, in ultra-fast optical communications. However, high-quality picosecond laser is generally not available at some non-conventional wavelengths due to the lack of efficient gain medium. Thanks to the ultra-fast response, wide-gain bandwidth, high gain and large detune from the pump of fiber optical parametric amplifier (FOPA), efficient short pulse generation is possible at non-conventional wavelengths.

A fiber OPA relies on the third-order nonlinear susceptibility x(3) of glass: a signal frequency at ws will be amplified by a strong co-propagating pump at wp in a fiber through this parametric process. Therefore, OPA may find applications as optical amplifiers in WDM transmission. Another frequency, called idler, will also be generated at wi = 2wp – ws. This contains essentially the same modulation information as the input signal, but with an inverted spectrum.

Conventionally, optical parametric oscillator (OPO) based on x(2) nonlinear effect of crystals is utilized for parametric oscillation. This technique has a wide range of applications in optical research and development. However, this approach requires a dedicated alignment for optimal operation. Fiber optical parametric oscillators (FOPO), which based on parametric gain provided by fiber OPA, eliminate the need for alignment and allow further integration with fiber components.

In this presentation, we demonstrate a fully fiber-integrated widely-tunable picosecond optical parametric oscillator based on highly-nonlinear fiber, with the tuning range as wide as 250 nm around 1550 nm. The totally fiber-integrated nature of this source allows completely self-alignment and further integration to other systems. This scheme may be useful in generating short pulse for potential ultra-fast communication in non-conventional wavelength bands and biomedical imaging applications.

Presenter Biography: 

Kenneth K. Y. Wong
Assistant Professor
Department of Electrical and Electronic Engineering
The University of Hong Kong

Dr. Kenneth Kin-Yip Wong received combined B.E. (1st class honor with medal award) degree in electrical engineering and B. S. degree in physics from the University of Queensland, Brisbane, Australia, in 1997. He received the M.S. degree in 1998 and the Ph.D. degree in 2003, both in electrical engineering at Stanford University. He was a member of the Photonics and Networking Research Laboratory at Stanford University. His research field included DWDM systems, SCM optical systems, fiber nonlinearity, fiber optical parametric amplifiers, and photonic crystal fibers. He is author or coauthor of over 100 journal and conference papers. He worked in Hewlett-Packard Laboratories as research engineer and contributed in projects included parallel optics and VCSEL in 1998-99. He also worked as independent consultant in Innovation CORE (A Sumitomo Electric Company), CA, in 2004.
He was the recipient of OSA New Focus Student Award and IEEE/LEOS Graduate Student Fellowship, both in 2003. He is the reviewer for Optics Letters, JOSA B, Optics Express, IEEE Photonics Technology Letters, IEEE/OSA Journal of Lightwave Technology, IEE Electronics Letters and Optics Communications. Dr. Wong is currently an Assistant Professor in the Department of Electrical and Electronic Engineering in the University of Hong Kong, where he won the Best Teacher Award 2005-06. He is a member of the OSA, IEEE, and IEEE Photonics Society (formerly LEOS).