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Broadly wavelength-tunable external cavity lasers with extremely low power variation over tuning range

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6 Author(s)
Oh Kee Kwon ; Opt. Commun. Devices Dept., Electron. & Telecommun. Res. Inst., Daejeon, South Korea ; Kang Ho Kim ; Eun Deok Sim ; Jong Hoi Kim
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Tunable external-cavity lasers with low power variation over a broad tuning range are demonstrated using asymmetric multiple quantum-wells with a wide and flat gain. For a 2.8-μm-wide ridge waveguide laser of cavity length 380 μm, when used in a grating external cavity and with an antireflection coating on one facet of laser diode chip, the power variation of less than -1 dB is obtained over a range of 80 nm. This extremely low power variation is a direct result of the spectrally flat gain.

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Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 3 )