Broadband tunable optical amplification based on modulation instability characteristic of high-birefringence photonic crystal fibers

Abstract

A novel high-birefringence photonic crystal fiber (HB-PCF) with two zero-dispersion wavelengths (ZDWs) is designed, and an extraordinarily high modal birefringence of 1.56×10−2 is obtained at pump wavelength λp = 1850 nm. With the designed HB-PCF, the effect of the pump parameters on the modulation instability (MI) in the anomalous dispersion region close to the second ZDWs of the HB-PCF is comprehensively studied in this work. A broadband and tunable optical amplification is achieved by controlling the pump power and the pump wavelength based on the combined operation of Raman effect and cross phase modulation. By optimizing the pump parameters, the amplification bandwidth along the fiber slow axis reaches 152 nm for the pump power Pp = 280 W and the pump wavelength λp=1675 nm, while the gain bandwidth along the fiber fast axis is 165 nm for the pump power Pp = 600 W and the pump wavelength λp = 1818 nm.

Modulation instabilities in randomly birefringent two-mode optical fibers

“…[8][9][10] MI can be applied for ultrashort pulse generation and supercontinuum generation. [11][12][13][14][15][16][17][18] In optics, MI usually occurs for the anomalous dispersion, but under some specific physical settings, MI can also occur in the normal dispersion regime. [19][20][21][22][23][24] In recent years, space-division multiplexing (SDM) systems based on the few mode and multicore fibers have been proposed as a promising technology to increase the transmission capacity of optical fibers, and has attracted worldwide interests.…”

Ultrashort pulse breaking in optical fiber with third-order dispersion and quintic nonlinearity

“…Owing to the interplay of the dispersion effects and self-phase or cross-phase modulation, many interesting and useful nonlinear optical phenomena, such as modulation instability, [1,2] optical solitons, [3] supercontinuum generation, [4][5][6] pulse compression, [7,8] etc., can occur in optical fibers. Typically, optical wave breaking, as an important phenomenon, is thought to occur in a normal dispersion optical fiber and generally manifests itself in the appearance of oscillation structures in the wings of the pulse and, concomitantly, in the sidelobes on the pulse spectrum.…”

Polarization characteristics of chiral photonic crystal fibers with an elliptical hollow core

“…[2] The nonuniform extrusion or drawing may result in a non-circular symmetry of the core, say the circular core may change into an elliptical one. [15][16][17] which may cause complicated polarization characteristics. For the fiber communication system, an extremely low degree of birefringence may lead to crucial polarized mode dispersion.…”

“…The non-circular symmetry of the core may occur on the scale of wavelength, which is called structural asymmetry, while chirality is another asymmetry on a smaller scale, which is named asymmetry of the medium. It is well known that an elliptical core in a PCF with circular-hole background leads to linear birefringence (LB), [15][16][17][18] while the chirality of a medium constituting PCF gives rise to circular birefringence (CB), [19,20] which means both of them can be used to design and control dispersion and polarization. When both the elliptical core and chirality exist, some novel features may emerge, especially in polarization.…”