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L-band tunable external cavity laser based on 1.58 μm superluminescent diode integrated with spot-size converter

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Abstract

We report a 1.58 μm superluminescent diode (SLD) with a spot-size converter (SSC) designed and fabricated as a light source for a tunable external cavity laser (T-ECL). The active section of the SLD is fabricated by using a planar buried heterostructure (PBH) for low-threshold current and high-output power operation at a low injection current. The SSC structure of the SLD is designed to possess a buried deep-ridge waveguide (BD-RWG) and show a beam of less divergence. The full-width at half maximum (FWHM) of the horizontal and vertical far-field patterns (FFPs), due to the beam of the less divergence, are 14° and 13°, respectively. We also confirm that an L-band T-ECL employing the SSC SLD operates well enough to prove the characteristics of high performance.

©2010 Optical Society of America

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Figures (6)

Fig. 1
Fig. 1 FFP characteristic with the ridge width of SSC region.
Fig. 2
Fig. 2 (a) Schematic configuration of the L-band SSC SLD having novel SSC; (b) schematic configuration of the front facet in SSC region.
Fig. 3
Fig. 3 (a) L-I characteristics of the fabricated SSC SLDs as a function of the injection current and (b) output spectra of SSC SLD.
Fig. 4
Fig. 4 FFP characteristics from the SSC facet of SLD
Fig. 5
Fig. 5 L-I characteristics of T-ECL with no TEC.
Fig. 6
Fig. 6 Wavelength tuning characteristics of the polymer Bragg grating tunable laser for 16 channels; (a) C-band T-ECL, (b) L-band T-ECL.
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