In this work, we propose the realization of two single mode distributed feedback (DFB) lasers emitting at 1.5μm with ultra-narrow linewidths, co-integrated on a co-doped Erbium Ytterbium IOG11 glass substrate. The beating note of these two lasers on a fast photodiode is used to generate mm-wave signals. Each laser is composed of a waveguide fabricated by ion exchange with a Bragg grating etched on the top. In order to set a precise value of the mm-wave frequency, the emission wavelength of both DFB lasers must be accurately fixed. This is achieved by controlling the laser’s waveguide design. The beating produced between these lasers generates mm-wave signals from GHz to THz. The co-integration helps to enhance the beating quality by reducing fluctuations between the two lasers. Lasers are first studied independently: their optical power, linewidth and relative intensity noise are characterized. Finally, the beating signal quality is estimated through the characterization of the produced electrical spectrum.
Nisrine Arab, Lionel Bastard, and Julien Poëtte, "Co-integration of two DFB lasers on glass for millimeter-wave generation," Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI, 1010605 (Presented at SPIE OPTO: January 30, 2017; Published: 16 February 2017); https://doi.org/10.1117/12.2250136.
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