A simple scheme to generate power-efficient FCC-compliant UWB pulses is proposed by using a dual-drive Mach-Zehnder modulator (DD-MZM). By adjusting the working parameters of the DD-MZM, a UWB quasi-quadruplet pulse with a spectral power efficiency of 49.2% and a 10-dB bandwidth of 6.22 GHz is obtained via computer simulations. Furthermore, this UWB… (More)
Writing a fiber Bragg grating (FBG) in an optical fiber coupler is a very effective way to implement an optical add/drop filter (OADF). In order to analyze the influences on the bandwidth at the drop port of the OADF using fiber grating-assisted mismatched coupler, a uniform FBG and a linearly chirped FBG were written on the coupler, and two different OADFs… (More)
We describe a general engineering method to compute a tighter bound on fiber-optic channel capacity and the optimum source distribution. This method first determines the conditional probability density functions of an optical fiber channel by evaluating histograms, or by instantons or edgeworth expansion approach. Starting from any source distribution, we… (More)
Interactions between supercontinuum (SC) light pulses, produced by the propagation of rapidly sequenced picosecond pump laser pulses along a photonic crystal fiber, result in spectral broadening, which we attribute to interpulse soliton collisions. This phenomenon was measured experimentally, following our observation of spectral broadening in numerical… (More)
A new orthogonal-polarization dual-wavelength fiber laser by fabricating a uniform FBG and a chirped FBG in a polarization-maintaining erbium-doped fiber (PM-EDF) is proposed and demonstrated. The wavelength space is 0.18nm and the optical signal-to-noise ratio is greater than 50 dB with pump power of 246-mW. Chirped FBG is used to make the reflectivity… (More)
A multi-pumping scheme to get a gain-flattened fiber Raman amplifier is presented and a complete computing model is established to optimize the pump wavelength and power allocation with flat gain and broad bandwidth.