Characterization of chromatic dispersion in photonic crystal fibers using scalar modulation instability

Abstract

A simple and accurate method is proposed for characterizing the chromatic dispersion of high air-filling fraction photonic crystal fibers. The method is based upon scalar modulation instability generated by a strong pump wave propagating near the zero-dispersion wavelength. Measuring the modulation instability sideband frequency shifts as a function of wavelength gives a direct measurement of the fiber's chromatic dispersion over a wide wavelength range. To simplify the dispersion calculation we introduce a simple analytical model of the fiber's dispersion, and verify its accuracy via a full numerical simulation. Measurements of the chromatic dispersion of two different types of high air-filling fraction photonic crystal fibers are presented.

Widely-tunable triply-resonant optical parametric ring oscillator

“…The coupling to the fibre ring cavity is achieved via a fusion splice that is optimised to provide a low threshold. The relatively high Q of this oscillator results in a threshold power of only 0.7W (more than an order of magnitude lower than previously described widely-tunable PCF oscillators [1,2,3]), and a frequency detuning for the modulation instability (MI) sidebands from 11THz to 41THz above and below the pump frequency when the pump is tuned from 1565nm to 1525nm. While the all-fiber nature of this design results in a robust oscillator, an active stabilisation has to be employed to keep the frequency of the ECL laser at a value where the phase-matching condition inside the resonator is fulfilled for all three wavelengths.…”

Theory of cavity-enhanced spontaneous four wave mixing

“…Relying on the stepindex model [37] for the description of the dispersion in a photonic crystal fiber (PCF), we have found that a PCF with core radius r = 0.68µm, and air-filling fraction f = 0.5, exhibits phasematching for degenerate pumps at λ p = 1.064µm, with SFWM wavelengths λ s = 0.852µm and λ i = 1.417µm. Note that the λ s value is matched to the atomic transition.…”

Analysis of Optical Properties for Square, Circular and Hexagonal Photonic Crystal Fiber

“…The core region always has high refractive index (silica glass) where the cladding region is usually provided by micro structured arrangement of air holes along the fiber [1]. Conventional fibers have harsh design rules as the core size is limited as well as limitation on material selection where light propagates through it using total internal reflection (TIR) concept [2], as a result light can propagate a small distance. But in photonic crystal fibers, the light propagation consequence is somewhat different [3].…”