Kaoru NAKAJIMA, Yuki KOMAI, Eriko WATANABE, Fumi MORITSUKA, Shimako ANZAI, and Kashiko KODATE^*

Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan

(Received March 1, 2007; Accepted May 7, 2007)

We designed and developed a volume phase holographic (VPH) grism with high resolution and high efficiency in the near-infrared light domain (1550 nm) to be applied as a wavelength de-multiplexing device of a photonic network. In order to achieve both diffraction efficiency of over 80% and wavelength resolution of 0.08 nm, we newly designed and fabricated a VPH grism with high efficiency and high wavelength resolution in near-infrared wavelength region by sandwiching a VPH grating between prisms. An active feedback control technique was introduced to a two-beam interference exposure system, and we also applied it to a wavelength de-multiplexing device for a photonic network. Consequently, a VPH grism was successfully fabricated with diffraction efficiency of over 80% by employing the Bragg condition of 1550 nm at the incident wavelength from 1530 to 1570 nm, and high refractive index modulation of 0.047 was confirmed.

Key words: VPH grism, near-infrared VPH grating, phase-control technique, photonic network, wavelength de-multiplexing device

^*E-mail address: kkodate@fc.jwu.ac.jp