Title :
Octave-spanning frequency comb generated by 250 fs pulse train emitted from 25 GHz externally phase-modulated laser diode for carrier-envelope-offset-locking
Author :
Ishizawa, A. ; Nishikawa, T. ; Mizutori, Akira ; Takara, Hidehiko ; Aozasa, S. ; Mori, Alessandro ; Nakano, Hisamatsu ; Takada, Akifumi ; Koga, Masafumi
Author_Institution :
NTT Basic Res. Labs., NTT Corp., Atsugi, Japan
Abstract :
Proposed is an approach to achieving a carrier-envelope-offset (CEO)-locked frequency comb with 25 GHz mode spacing in the telecommunications wavelength region. To achieve the approach, a 250 fs laser pulse train at a 25 GHz repetition rate was developed by intensity- and phase-modulating a seed light emitted from a continuous-wave laser diode and propagating it through a dispersive fibre. Using the authors developed tellurite photonics crystal fibre with a high-nonlinear coefficient, octave-spanning supercontinuum generation in the 1.5 m band from a 250 MHz gated pulse train for CEO frequency detection was demonstrated.
Keywords :
holey fibres; intensity modulation; laser mode locking; optical fibre dispersion; phase modulation; carrier-envelope-offset-locking; continuous-wave laser diode; dispersive fibre; externally phase-modulated laser diode; frequency 25 GHz; high-nonlinear coefficient; intensity modulation; locked frequency comb; mode spacing; octave-spanning frequency comb; octave-spanning supercontinuum generation; pulse train; repetition rate; telecommunications wavelength region; tellurite photonics crystal fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2228
