1. Spectral narrowing effect by quasi-phase continuous tuning in high-speed wavelength-swept light source

    Spectral narrowing effect by quasi-phase continuous tuning in high-speed wavelength-swept light source
    This paper reports on a technique to improve the coherence length of a high-speed wavelength swept laser. The wavelength swept laser comprises a pigtailed semiconductor optical amplifier and a wavelength-scanning filter in a fiber extended cavity configuration. The laser operates in the 1310 nm wavelength region. The tunable filter consists of a diffraction grating and polygon mirror scanner. Littrow arrangement of external cavity in a specific geometry realizes the quasi-phase continuous tuning over wavelength range emphasizing coherent amplification of cavity modes resulting in spectral narrowing of the instantaneous linewidth to about 0.06nm. Improvement by a factor of two is ...
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