Effects of apodization on a holographic demultiplexer based on a photopolymer grating

Abstract

An investigation of the effects of apodization on a holographic demultiplexer that is based on a photopolymer grating is presented. Uniform and Gaussian apodized gratings are fabricated in a DuPont HRF-150-38 photopolymer. From the theoretical and experimental results, the spectral response of the apodized grating has a larger main lobe but lower sidelobes than those in the uniform-grating case. A 42-channel demultiplexer that is based on the Gaussian apodized grating with an 0.4-nm channel spacing is demonstrated. A cross-talk level of -30 dB and an interchannel uniformity of 1.5 dB are archived in the wavelength range of approximately 1550 nm.

Design concepts for diffusive holographic photopolymers

“…These waveguides, in conjunction with other recorded components including couplers, optical interconnects, and coherent waveguide arrays, together enable the realization of complete integrated devices. Even greater functionality is enabled by Bragg gratings, which can serve as filters for wavelength multiplexing, as resonators for polymer lasers, as mechanical sensors, or as chemical sensors for applications including vapor detection and tear glucose monitoring in contact lenses . These can be further integrated with microfluidics within a single material platform for lab‐on‐a‐chip applications …”

Optimization of Diffraction Efficiency and Polarization Dependence Loss in Photopolymer Grating for Use in Multichip Module

“…We consider a volume transmission grating structure composed of N-index modulation grating recorded in a single-mode wave guiding layer such that the reconstructing angle " R  " satisfies the constructive interference Bragg's condition given by the following equation in terms of grating period and reconstruction angle R  is given by [8]…”

Light erasing method for fabricating planar waveguide volume holographic gratings in LiNbO 3 :Fe crystal

“…The relation between the photovoltaic current and space charge field is given by Where β s and β a are, respectively, the symmetrical and anti-symmetrical photovoltaic tensor, J 3 is parallel to c-axis of the crystal. As for LiNbO 3 (2) From equation (2), we can find that the photovoltaic current is mainly attributed by J 3 , whether the recording light polarized along any direction, namely, J 3 is the primary driver of the photorefractive effect in LiNbO 3 crystal. We assume that LiNbO 3 crystal is affected by the electric field U (U 1 , U 2 , U 3 ), where U 1 , U 2 , and U 3 are respectively the electric field components along the direction of x 1 , x 2 , and x 3 (x 3 is parallel to c-axis of the crystal).…”