title: Low-crosstalk operation of directly modulated DFB laser array TOSA for 112-Gbit/s application.
abstract: A directly modulated DFB laser (DML) array transmitter optical sub-assembly (TOSA) operating at 112 Gbit/s was fabricated for the first time. The DML array chip, which was integrated with a GND pad, and the DML array sub-assembly were designed to suppress the adjacent electrical crosstalk of the DML array TOSA. The 3-dB bandwidths of the fabricated TOSA exceeded 18 GHz. The electrical crosstalk of the TOSA was suppressed to less than -20 dB below 18GHz. Under simultaneous 4-channel 28-Gbit/s (112 Gbit/s) operation, the OTU4 mask margins were degraded by a maximum of only 6% compared with those under discrete operation. Error-free transmissions over a 10-km single-mode fiber were demonstrated for all the lanes under 112-Gbit/s operation.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kanazawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Kobayashi
authors.forename: Yuta
authors.initials: Y
authors.lastname: Ueda
authors.forename: Takeshi
authors.initials: T
authors.lastname: Fujisawa
authors.forename: Tetsuichiro
authors.initials: T
authors.lastname: Ohno
authors.forename: Toshihide
authors.initials: T
authors.lastname: Yoshimatsu
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ishii
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Sanjoh