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학술지 Proposal of Novel Structure for Wide Wavelength Tuning in Distributed Bragg Reflector Laser Diode with Single Grating Mirror
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권오기, 이철욱, 김기수, 오수환, 임영안
Optics Express, v.26 no.22, pp.1-9
Optical Society of America(OSA)
We report a novel structure that is capable of wide wavelength tuning in the distributed Bragg reflector laser diode (DBR-LD) with a single grating mirror. This device's DBR section has two tuning elements, plasma, and heater tunings, which are implemented simultaneously on the top of a single waveguide by using an in-between dielectric layer. For the proposed structure, a three-dimensional thermal simulation was conducted. The results showed that the temperature profile within the waveguide is highly affected by the position of heater metal and thermal conductivity of the p-cladding layer. As a result, it is important to use a uniform temperature region in the DBR section for a wide tuning range and stable single-mode operation. For a 550-μm long DBR-LD with a 250-μm long DBR section, a tuning range of 26 nm (i.e., 7 nm for plasma tuning and 19 nm for heater tuning); an SMSR of more than 45 dB; and a peak power variation of less than 짹 2.5 dB were obtained. From the comparisons of two DBR-LDs with only one tuning element, we confirmed that using the dielectric layer is a very effective way of achieving a wide tuning under the independent tuning operation.
KSP 제안 키워드
Cladding layer, Distributed Bragg reflector laser, Grating mirror, In-between, Laser diode(LD), Peak power variation, Single grating, Single-mode operation, Temperature profile, Thermal Simulation, Three dimensional(3D)