[OPTICAL REVIEW Vol. 11, No. 2 (2004) 119-125]
© 2004 The Optical Society of Japan

Design of Header Recognition Filter for Binary Phase Shift Keying in Header Recognition Unit using Time-Space Conversion

Hideaki FURUKAWA*, Tsuyoshi KONISHI, Yoshinori OSHITA, Wanji YU1, Kazuyoshi ITOH and Yoshiki ICHIOKA2

Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
1Osaka Science and Technology Center, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan
2Nara National College of Technology, 22, Yatamachi, Yamatokoriyama, Nara 639-1080, Japan

(Received December 1, 2003; Accepted January 21, 2004)

Optical header recognition is one key function that enables ultrafast optical routing in photonic packet-switched networks. Especially, optical header recognition based on optical correlation processing has attracted much attention. Header signals using optical codes are decoded using optical correlation processing. We improve the decoding method for Binary Phase Shift Keying (BPSK) header signals in order to suppress crosstalk caused by matched filtering in the header recognition unit. We design a header recognition filter using the technique of a multiple-object discriminant filter (MODF). Results of preliminary experiments show that the designed header recognition filter can suppress crosstalk. The intensity ratio of correlation signals of a target header signal to non-target ones is higher than 1.95:1 in case of 4-bits BPSK header signals.

Key words: optical correlation, optical header recognition, time-space conversion, multiple-object discriminant filter, binary phase shift keying (BPSK), optical pulse code, optical decoding

*E-mail address: furukawa@photonics.mls.eng.osaka-u.ac.jp