Broadband optical gain in the normally dispersive region of a high-birefringence photonic crystal fiber

Abstract

Based on a designed high-birefringence photonic crystal fiber (HB-PCF) with two zero-dispersion wavelengths (ZDWs), the effect of pump parameters and Raman scattering on the modulation instability (MI) gain is comprehensively analyzed in this paper. An interesting result is found, in that only when the pump wavelength lies within an approximately 10 nm range of the zero-dispersion points in the normal dispersion region of the HB-PCF does a broadband gain characteristic appear. The Raman effect results in a combination of the gain spectra from the Stokes and anti-Stokes band, which finally promotes the formation of broadband amplification. Moreover, there exist an optimal pump wavelength and a suitable pump power along the fast axis or the slow axis of the fiber. With these optimal pump parameters, the total MI gain bandwidth finally reaches 159 nm for the fiber fast axis and 162 nm for the fiber slow axis.

Pressure dependent modulation instability in photonic crystal fiber filled with argon gas

“…[7] For the fiber, our previous research results show that the MI gain mainly depends on the fiber dispersion, the fiber nonlinearity, and stimulate Raman scattering. [8][9][10] Among them, the Raman scattering effect is mainly determined by the fiber substrate material (for example, fused silica), which is not easy to change once fiber is made. Thus, in order to manipulate the MI gain in experiment effectively, it is convenient to adjust the fiber structure or its refractive index distribution for controlling the fiber dispersion and nonlinearity.…”

Ultra-broadband modulation instability gain characteristics in As 2 S 3 and As 2 Se 3 chalcogenide glass photonic crystal fiber

“…[6,7] Besides, its high nonlinearity (n 2 is almost 100-1000 times as high as that of silica at 1.55 µm [8] ) has led to the demonstrations of high speed, all optical signal processing in a compact, planar waveguide geometry for next generation optical communications systems. [9] From our previous work, [10][11][12] one can know that modulation instability (MI) gain depends on Raman effect and nonlinearity of fiber, while the As 2 Se 3 and As 2 S 3 chalcogenide glass PCFs have high Raman gains and high nonlinearities. Therefore, the effects of high Raman scattering and high nonlinearity on MI gain in the As 2 Se 3 and As 2 S 3 glass PCFs are a worthwhile research topic.…”

Hollow-core photonic quasicrystal fiber with high birefringence and ultra-low nonlinearity

“…Birefringence is the difference of the effective refractive indexes of two orthogonal polarization modes. The higher the value is, the stronger the ability to maintain polarization is [42] . The equation is expressed as…”