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We present optical ultrawideband doublet generation from NRZ-DPSK signals based on a length of SMF. The generated ultrawideband spectra using 25km SMF and 15km SMF are analyzed contrastively.
We have proposed a new kind of ultra-narrow dual-bandpass fiber Bragg gratings. Based on the proposed grating, an ultra-narrow dual-channel filter is designed. Our filter has the same bandwidth and the even strength, as well as the ultra-narrow bandwidth as small as ≪1 pm.
The influence of dispersion of the highly nonlinear fiber in the loop of a nonlinear amplifying loop mirror on its performance as a 2R regenerator for phase-encoded optical signals has been studied.
Polarization properties of a long-period grating inscribed in a single-mode photonic crystal fiber are presented. A strong modulation in the spectra of polarization-dependent loss and differential group delay with periods of 2.6 and 1.3 nm is reported.
We propose an all-fiber wavelength tunable bandpass filter with multi-mode to single-mode converting property via serially concatenated structure of a helicoidal long-period fiber grating (HLPFG), a hollow optical fiber (HOF), and a multimode fiber (MMF).
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