Low Driving Voltage Operation of MZI-Type EA Modulator Integrated with DFB Laser Using Optical Absorption and Interferometric Extinction

Yuta Ueda, Takeshi Fujisawa, Shigeru Kanazawa, Wataru Kobayashi, Kiyoto Takahata, Hiroaki Sanjoh, Hiroyuki Ishii, Masaki Kohtoku

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We have developed a novel electroabsorption modulator (EAM)-integrated distributed feedback laser (EA-DFB laser), in which an EAM functioning as an external modulator is integrated in a Mach-Zehnder interferometer (MZI). The MZI-Type EAM (MZEA) modulates light intensity by both optical absorption and interferometric extinction. As a result, it improves the extinction ratio (ER) of a conventional EAM, which allows us to reduce the modulation voltage ( Vrm m}}), and thus reduce the power consumption of the driver circuit. A fabricated MZEA-integrated DFB laser (MZEA-DFB laser) exhibited high-ER operation and an output power of about 8 dBm, which is comparable to that of a conventional EA-DFB laser, with a 100-mA laser current. Thanks to the high ER and sufficient output power, the MZEA-DFB laser operating at half the Vrm m}} of a conventional EA-DFB laser is able to generate optical signals with a given optical modulation amplitude, and we achieved a 25.8-Gb/s 40-km transmission with the novel laser at a Vrm m}} of 1 {\rm V{pp}}.

Original languageEnglish
Article number7080894
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume21
Issue number6
DOIs
Publication statusPublished - 2015 Nov 1
Externally publishedYes

Keywords

  • DFB laser
  • Electroabsorption modulator
  • Low-voltage operation
  • Mach-Zehnder interferometer
  • Semiconductor optical device

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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