For the first time long broadband chirped fiber Bragg gratings with a dispersion profile designed to compensate 3rd order-dispersion are presented. These results demonstrate how the increased demands for dispersion compensation at very high bit-rates can be met using chirped fiber Bragg gratings. LONG CONTINUOUSLY CHIRPED FIBER BRAGG GRATINGS FOR COMPENSATION OF LINEAR AND 3rd ORDER DISPERSION ...

We demonstrate for the first time experimental results of chirped and chirp-apodized Bragg gratings written into planar substrates. The gratings are written using Direct Grating Writing, allowing both buried channels and gratings to be defined simultaneously. The experimental results are then compared to theory and agree well with predicted spectra. KeywordsBragg gratings; planar waveguides; ch...

Reflective uniform volume Bragg gratings (VBGs) in photo-thermo-refractive (PTR) glass are used as narrow-band output couplers in high-power lasers with different gain media [1]. VBGs with longitudinally chirped grating period are used for stretching and compression of ultrashort laser pulses in well established chirped pulse amplification schemes [2]. Here we discuss reflective VBGs with chirp...

A Bragg-reflection-based ring resonator is proposed and analyzed. Closed-form expressions for the field and dispersion curves for radial Bragg gratings and photonic bandgap crystals are derived. The required gratings exhibit a chirped period and a varying index profile. Small bending radii and strong control over the resonator dispersion are possible by the Bragg confinement. Large free spectra...

The characteristics of guided waves scattered by nonuniform Bragg waveguide gratings are systematically investigated by using a staircase approximation, which is a combination of the building blocks of the multimode network theory and a rigorous mode-matching procedure. The bent dielectric waveguides, periodically with Bragg gratings of rectangular profile and chirped waveguide gratings, are ta...

A ring resonator based on Bragg reflection is studied in detail. Closed form expressions for the field and dispersion curves for radial Bragg gratings and photonic crystals based resonators are derived and compared to FDTD simulations. For strong confinement, the required gratings exhibit a chirped period and a varying index profile. Small bending radii and low radiation losses are shown to be ...

We propose a novel method for multiple parameters and phase reconstruction of a chirped Fiber Bragg Grating (FBG) through two thermally-modulated reflection intensity spectra and genetic algorithm. Two temperature distributions are used to modulate the chirped FBG’s intensity spectrum in order to synthesize FBG’s parameters through a genetic algorithm. Thus, the phase response can be reconstruc...

Numerical analysis of the dispersion-compensating properties of fiber Bragg gratings (FBG’s) in both reflective and transmissive modes is presented. First, the sensitivity of chirped, reflective gratings to the grating chirp parameter, index modulation, and grating length is examined, showing that apodization provides lower sensitivity to variations in these parameters. Second, we introduce a n...

A lidar system based on the coherent detection of oppositely chirped pulses generated using a 20 MHz mode locked laser and chirped fiber Bragg gratings is presented. Sub millimeter resolution ranging is performed with > 25 dB signal to noise ratio. Simultaneous, range and Doppler velocity measurements are experimentally demonstrated using a target moving at > 330 km/h inside the laboratory.

We present an interferometric setup to write apodized or apodized-chirped Bragg Gratings at any wavelength with the same phase mask and to a precision of 0.1 nm. An encoder for CDMA applications is realized.