Precise operation-frequency control of monolithic mode-locked laser diodes for high-speed optical communication and all-optical signal processing

I. Ogura, H. Kurita, T. Sasaki, H. Yokoyama

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

We describe a method for pulse-repetition-frequency tuning of mode-locked laser diodes (MLLDs) monolithically integrated with a distributed Bragg reflector (DBR). The pulse-repetition frequency, i.e., the cavity-roundtrip time, is tuned through loss-induced change in the effective length of the DBR. The frequency-tuning range as large as the chip-to-chip frequency deviation caused by cavity-length fabrication variation of 10 μm has been confirmed experimentally, and the MLLDs operate at SDH (synchronous digital hierarchy) frequencies of 9.953, 19.906 and 39.813 GHz. Synchronization with an external system-clock through the hybrid mode-locking operation reduces the timing jitter of the optical pulses to less than 0.3 ps. As an optical pulse source for optical communication, error-free 20-Gbps transmission over 3000 km has been demonstrated, confirming that the MLLD properties satisfy the requirements for use in real systems. The novel application of MLLDs to all-optical clock extraction, one of the ess ential functions required in all-optical signal processing, has been demonstrated at the 40-GHz SDH frequency.

Original languageEnglish
Pages (from-to)709-725
Number of pages17
JournalOptical and Quantum Electronics
Volume33
Issue number7-10
DOIs
Publication statusPublished - 2001 Jul
Externally publishedYes

Keywords

  • Clock extraction
  • Mode-locking
  • Optical communication
  • Semiconductor lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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