title: A flat-output widely tunable laser based on parallel-ring resonator integrated with electroabsorption modulator.
abstract: We present a novel parallel-ring-resonator tunable laser monolithically integrated with an InGaAlAs electroabsorption modulator. The fabricated tunable laser exhibits stable wavelength tuning with a step of 200 GHz over a wide tuning range of 35 nm, achieved with a single electrode control. The variation in the laser output power with wavelength tuning is less than 1 dB even at an injected tuning current of 20 mA. Clear eye openings at 25 Gbit/s with a dynamic extinction ratio of more than 10 dB are demonstrated over a wavelength range of 25.7 nm with a constant voltage swing of 2 V at 45 °C. Error-free operation is confirmed under the same operating conditions.
authors.affiliation: NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan. segawa.toru@lab.ntt.co.jp
authors.forename: Toru
authors.initials: T
authors.lastname: Segawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Kobayashi
authors.forename: Tomonari
authors.initials: T
authors.lastname: Sato
authors.forename: Shinji
authors.initials: S
authors.lastname: Matsuo
authors.forename: Ryuzo
authors.initials: R
authors.lastname: Iga
authors.forename: Ryo
authors.initials: R
authors.lastname: Takahashi