200分求下关于通信的[英译汉]谁快分给谁

200分求下关于通信的[英译汉]谁快分给谁
Abstract—Genetic algorithm is adopted to give an automatic design
scheme for fiber-based optical parametric amplifiers (FOPAs).
Main steps of the optimization process and discussion about this
algorithm are presented. The results show that present FOPA has
more than 300-nm flat bandwidth with a central wavelength of
1500 nm and a gain ripple of less than 0.3 dB. Meanwhile, fluctuation
in zero-dispersion wavelength of fibers is taken into consideration
and its influence is briefly analyzed.
Index Terms—Bandwidth, fiber-optical parametric amplifier
(FOPA), flatness, genetic algorithm (GA), multisection high
nonlinear fiber.
I. INTRODUCTION
FIBER-BASED optical parametric amplifiers (FOPAs) [1],
[2] are now attracting widespread interest due to their various
merits such as broad-band, low noise, and flexible center
wavelength. However, by using single-pump FOPA design, it is
difficult to provide a flat gain spectrum within a wide range of
wavelengths [2]. In response to this limitation, several models,
such as dual-wavelength pumping [3], [4] and multisection design
[5], [6], are proposed to resolve the problem. Among them,
the multisection design seems more promising. It efficiently enlarges
and flattens the gain spectrum by use of several consecutive
highly nonlinear fibers with different zero-dispersion wavelengths
(ZDWs) and lengths [6]. The biggest difficulty of this
design lies in how to determine the large sums of parameters.
Genetic algorithm (GA) [7] is very effective in such problems
and has been proven very successful in optimal design of fiber
Raman amplifier [8] and difference frequency generation-based
wavelength conversion [9]. In this letter, we originally extend
the GA into the optimization of multisection FOPA design and
demonstrate the effectiveness of this scheme by providing one
design of FOPA.