1.5μm, mode-hop-free full C-band wavelength tunable laser diode with a linewidth of 8 kHz and a RIN of -130 dB/Hz and its extension to the L-band

Keisuke Kasai, Masataka Nakazawa, Yasunori Tomomatsu, Takashi Endo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We demonstrate a narrow-linewidth, low-intensity noise, widely wavelengthtunable LD for which we adopted a long external cavity configuration (ECLD) with a tunable optical filter. By employing a simultaneous tuning circuit between the optical filter and the Fabry-Perot mode caused by the external cavity, the oscillation wavelength was successfully tuned over the full C-band without mode hopping. The tunable optical filter bandwidth was 0.55 nm (1530∼1570 nm). We achieved a linewidth of less than 8 kHz obtained with a delayed self-heterodyne method. On the other hand, the linewidth estimated from the white noise level of the optical frequency modulation noise power spectrum of the laser output was as narrow as 314 Hz. A relative intensity noise (RIN) below -130 dB/Hz was simultaneously achieved over the C-band range. With the same configuration except for an optical filter with a filter bandwidth of 0.6 nm for L-band operation (1570∼1610 nm), we also realized a full Lband wavelength tunable ECLD with a linewidth of less than 7.7 kHz and a RIN of below -126 dB/Hz.

Original languageEnglish
Pages (from-to)22113-22124
Number of pages12
JournalOptics Express
Volume25
Issue number18
DOIs
Publication statusPublished - 2017 Sep 4

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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