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Proceedings Paper

Ultra-wideband fiber optical parametric amplifier for spectrally-encoded microscopy (Conference Presentation)
Author(s): Xiaoming Wei; Sisi Tan; Arnaud Mussot; Alexandre Kudlinski; Kevin K. Tsia; Kenneth Wong

Paper Abstract

Fiber optical parametric amplifier (FOPA) has gained its popularity in the telecommunication systems at the 1.5-um window for its gain, bandwidth etc. Unfortunately, its practical application at the bio-favorable window, i.e. 1.0 um, still requires substantial efforts. Thus, here we report a versatile all-fiber optical parametric amplifier for life-science (OPALS) at 1.0 um as an add-on module for optical imaging system. The parametric gain fiber (photonic-crystal fiber (PCF), 110 m in length) is specially designed to reduce the longitudinal dispersion fluctuation, which yields a superior figure of merit, i.e. a total insertion loss of ~2.5 dB and a nonlinear coefficient of 34 /(W•km). Our OPALS delivers a superior performance in terms of gain (~158,000), bandwidth (>100 nm) and gain flatness (< 3-dB ripple). Experimentally, we show that: 1) a wavelength-varying quasi-monochrome pump achieves a 52-dB gain and 160-nm bandwidth, but at the expense of a larger gain-spectrum ripple, i.e. a bell-shaped; 2) the birefringence of the parametric gain medium, i.e. PCF in this case, can be utilized to improve the gain-spectrum flatness of OPALS by 10.5 dB, meanwhile a 100-nm bandwidth can be guaranteed; 3) the gain-spectrum flatness of OPALS can be further flattened by using a high-speed wavelength-sweeping pump, which exhibits a 110-nm flat gain spectrum with ripple less than 3 dB. Finally, we employ this versatile all-fiber OPALS as an add-on module to enhance the sensitivity of a spectrally-encoded microscope by 47 dB over an ultra-wide spectral range.

Paper Details

Date Published: 28 June 2016
PDF: 1 pages
Proc. SPIE 9720, High-Speed Biomedical Imaging and Spectroscopy: Toward Big Data Instrumentation and Management, 97200W (28 June 2016); doi: 10.1117/12.2210811
Show Author Affiliations
Xiaoming Wei, The Univ. of Hong Kong (Hong Kong, China)
Sisi Tan, The Univ. of Hong Kong (China)
Arnaud Mussot, Lab. de Physique des Lasers, Atomes et Molécules, Univ. des Sciences et Technologies de Lille (France)
Alexandre Kudlinski, Lab. de Physique des Lasers, Atomes et Molécules, Univ. des Sciences et Technologies de Lille (France)
Kevin K. Tsia, The Univ. of Hong Kong (China)
Kenneth Wong, The Univ. of Hong Kong (China)


Published in SPIE Proceedings Vol. 9720:
High-Speed Biomedical Imaging and Spectroscopy: Toward Big Data Instrumentation and Management
Kevin K. Tsia; Keisuke Goda, Editor(s)

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