Polarization sensitivity of photopolymer-based volume holograms for one-to-many surface normal optical interconnects

Abstract

Polarization dependence of photopolymer-based volume holograms for substrate-guided-wave optical interconnects with surface normal configuration is investigated. Energy optimization and the tradeoff between energy equalization and polarization insensitivity of one-tomany cascaded interconnects are discussed. DuPont photopolymer film HRF 600X001-20 was employed in our experiment. A volume hologram with diffraction efficiency of 91.5%Ϯ1.5% is achieved for different linearly polarized optical waves. A 1-to-9 fanout device with Ϯ5% energy fluctuation for a randomly polarized input optical wave at 632.8 nm has been fabricated for evaluating the trade-off under p and s waves. As the Mylar substrate of the photopolymer films has strong effects in changing incident linearly polarized light into elliptically polarized light, the energy uniformity of a practical device can be improved significantly. The developed theory is applicable to any volume hologram. © 1998 Society of PhotoOptical Instrumentation Engineers. [S0091-3286(98)02402-7]

Path-reversed substrate- guided-wave optical interconnects for wavelength-division demultiplexing

“…One disadvantage of such a cascaded configuration is that the multiplefan-out energy uniformity and the overall efficiency are not polarization independent because of the large discrepancy in the diffraction efficiencies of the p and the s polarizations. 6 When each individual cascaded hologram is recorded with the maximum diffraction efficiency it can be used as a multiport WDM. If the same device is used for both multiplexing and demultiplexing a compromise is needed between the fan-out energy-distribution uniformity for demultiplexing and the coupling efficiencies of the first few cascaded holograms for multiplexing.…”