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Applied Optics

Applied Optics


  • Vol. 38, Iss. 8 — Mar. 10, 1999
  • pp: 1302–1310

Design, fabrication, and evaluation of a multichannel diffractive optic rotary joint

Mathias Johansson and Sverker Hård  »View Author Affiliations

Applied Optics, Vol. 38, Issue 8, pp. 1302-1310 (1999)

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A multichannel diffractive optic rotary joint was designed, fabricated by electron-beam lithography, and evaluated with regard to cross talk and to output signal power variations. High cross-talk margin (>25 dB) and low output signal power variations (<2 dB) were achieved. The sensitivity to input-light-beam wavelength uncertainty was investigated. Two design examples are presented. The first design eliminates cross talk due to unwanted diffraction orders and shows that for a ten-channel joint the wavelength uncertainty of an 850-nm emitting laser must be less than 8 nm. In the second design cross talk due to the second diffraction order is permitted, which results in a tolerance level that is three times better for wavelength uncertainty.

© 1999 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.3740) Optical design and fabrication : Lithography
(230.0230) Optical devices : Optical devices

Original Manuscript: September 25, 1998
Revised Manuscript: December 7, 1998
Published: March 10, 1999

Mathias Johansson and Sverker Hård, "Design, fabrication, and evaluation of a multichannel diffractive optic rotary joint," Appl. Opt. 38, 1302-1310 (1999)

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