Abstract

Transmission characteristic differences of a narrow bandpass filter between p- and s-polarized light, especially the central wavelength separation, will corrupt the performance of the filter when the incidence is oblique. In this paper, by adding high-index materials asymmetrically to both sides of a low-index spacer, which tunes the equivalent index of the spacer, the central wavelengths of the two polarizations coincide perfectly when in $20°$ incidence; with different reflected layers on the two sides of the spacers and replacing some reflected layers with equivalent layers, the $0.5\mathrm{dB}$ normalized passband width is kept at $0.2\mathrm{nm}$, which meets the requirement of the $50\mathrm{G}$ dense wavelength division multiplexer filter.

© 2010 Optical Society of America

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