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Proceedings Paper

Diffractive optical element for an electro-optical interface based on photonic mixer device (PMD)
Author(s): Wei Tai; Rudolf Schwarte; Bernd Buxbaum
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Paper Abstract

With the development of free space interconnection and optical computing different optics for these approaches have been designed, which are usually difficult to realize with conventional optical systems. The concept of an electrooptical interface based on the Photonic Mixer Device (PMD), which detects and mixes and optical signal simultaneously, has been proposed in previous publications. An array of vertical cavity surface-emitting lasers (VCSELs) is driven by input signals from different channels. The optical signals are then transformed by a lens system and a diffractive optical element (DOE) to a PMD array for processing and multiplexing. In this paper the DOE to realize the optical transformation in the electrooptical interface is presented. The DOE is composed an array of small segments, which correspond to the VCSELs with a pitch of about 250micrometers . The phase functions of the DOE are designed separately for each VCSEL to generate a shifted uniform distribution on the PMD-array. For compactness the segments on the edge work at a large diffraction angle, which leads to an equivalent quasi-constant phase gradient added to them and results in high frequency structure. Therefore, for simplification of the production of the DOE, a prism is combined with the DOE to generate the desired optical transformation. The optical transformation is investigated with the simulation tool ZEMAX. The simulation results show that the DOE with the designed phase function works well for the PMD based optical interface, and it is possible to realize a parallel multi- channel electrooptical interface for code division multiplex access (CDMA) communications.

Paper Details

Date Published: 24 October 2000
PDF: 8 pages
Proc. SPIE 4093, Current Developments in Lens Design and Optical Systems Engineering, (24 October 2000); doi: 10.1117/12.405212
Show Author Affiliations
Wei Tai, Univ. Siegen (Germany)
Rudolf Schwarte, Univ. Siegen (Germany)
Bernd Buxbaum, Univ. Siegen (Germany)

Published in SPIE Proceedings Vol. 4093:
Current Developments in Lens Design and Optical Systems Engineering
Robert E. Fischer; Robert E. Fischer; R. Barry Johnson; Warren J. Smith; Warren J. Smith; William H. Swantner, Editor(s)

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