title: Analysis and demonstration of single-passband response and tuning characteristics in a chirped ladder interferometric filter for a widely tunable laser diode.
abstract: We have designed and demonstrated a chirped ladder-type tunable filter and discussed its potential application for a tunable diode laser. A ladder interferometric filter normally has a periodic passband, which makes it impossible to stabilize laser oscillation frequency. To overcome this drawback, we have designed, fabricated, and characterized a novel chirped tunable ladder filter. We have successfully demonstrated a single-passband response in the fabricated device. Furthermore, a tuning operation of more than 30 nm was achieved by introducing a current injection structure and optimizing electrode lengths at each single-stage ladder interferometer.
authors.affiliation: NTT Photonics Laboratories, NIT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan. jeong@aecl.ntt.co.jp
authors.forename: Seok-Hwan
authors.initials: SH
authors.lastname: Jeong
authors.forename: Shinji
authors.initials: S
authors.lastname: Matsuo
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Yoshikuni
authors.forename: Toru
authors.initials: T
authors.lastname: Segawa
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Ohiso
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Suzuki