A new design for a Fabry–Perot-based array filter for wavelength-division multiplexing (WDM) applications is proposed. The device is composed of two partially reflective mirrors; the surface of one of the mirrors is stepwise. Not only does the configuration of multiple air-gap cavities into a single unit provide wavelength tunability but the channel numbers can be expanded. A four-channel multiplexer has been demonstrated. The results revealed that a compact and cost-effective WDM device should be easily attainable.
© 2005 Optical Society of America
Original Manuscript: June 17, 2004
Revised Manuscript: November 8, 2004
Manuscript Accepted: November 10, 2004
Published: March 20, 2005
Der Yi Hsu, Jim Wein Lin, and Sen Yen Shaw, "Wide-range tunable Fabry–Perot array filter for wavelength-division multiplexing applications," Appl. Opt. 44, 1529-1532 (2005)