Showing papers by "Samir Ghalmi published in 2002"

Band-selection filters with concatenated long-period gratings in few-mode fibers

Abstract: We demonstrate a novel device that comprises a pair of broadband and narrowband long-period gratings written in specially designed few-mode fibers to achieve in-fiber bandpass filtering. This device configuration opens the possibility of using long-period gratings for complex spectral shaping in a band-selection as opposed to the conventional band-rejection configuration. The devices are low loss <0.5 dB as well as tunable over large spectral ranges (26 nm). We demonstrate, for the first time to our knowledge, that the unique dispersive properties of long-period gratings allow for constructing dispersion-free bandpass filters with arbitrarily sharp spectral profiles.

Wavelength-continuous broadband adjustable dispersion compensator using higher order mode fibers and switchable fiber-gratings

Abstract: We use switchable fiber-gratings in higher-order-mode fibers to demonstrate a wavelength-continuous adjustable dispersion-compensator (tuning range ~ 435 ps/nm) that is broadband (30 nm) and low loss (average ~ 3.7 dB). 40 Gb/s transmission tests reveal penalty-free operation

Multiple span dispersion compensation using all-fiber higher-order-mode dispersion compensators

Abstract: We demonstrate a low loss higher-order-mode dispersion compensator that enables practical implementation of lumped or multi-span dispersion compensation schemes. The connector-to-connector module loss is 3.16 dB, and yields -886 ps/nm of dispersion, corresponding to compensation of 200 km of NZDSF.