Acta Optica Sinica, Volume. 23, Issue 3, 377(2003)
Characteristics and Improvement of Dense Wavelength Division Multiplexing (DWDM) Thin Film Filters Used in Tilted Incidence
The characteristic of thin film narrowband filters used in tilted incidence is described. The wavelength shift to shorter wavelength in a low index spacer filter for p polarization component is larger than that for s polarization component when filter is tilted. On the contrary, the shift in a high index spacer filter for p component is less than that for s component. Therefore the passbands of a tilted filter can be centered at the same wavelength for two polarization modes by means of using high and low index materials for a spacer, or selecting a moderate index material instead of a spacer. Designs of DWDM filters used for incident angle of 20°are presented, and the experimental results are discussed.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Characteristics and Improvement of Dense Wavelength Division Multiplexing (DWDM) Thin Film Filters Used in Tilted Incidence[J]. Acta Optica Sinica, 2003, 23(3): 377