Impact Statement:Monolithically integrated dual-wavelength DFB (DW-DFB) laser is demonstrated theoretically and experimentally. The proposed DW-DFB laser consists of only one section. The...Show More
Abstract:
A monolithic integrated dual-wavelength DFB semiconductor laser is fabricated and experimentally demonstrated. Utilizing the reconstruction-equivalent chirp (REC) techniq...Show MoreMetadata
Impact Statement:
Monolithically integrated dual-wavelength DFB (DW-DFB) laser is demonstrated theoretically and experimentally. The proposed DW-DFB laser consists of only one section. The grating of the DW-DFB laser is a chirped sampled Bragg grating with two symmetric equivalent phase shifts (EPS). Since the photon distributions of two lasing modes are separated along the cavity, the mode competition between the two modes is effectively suppressed. Consequently, the performance of the DW-DFB laser is very stable. The operating stability of the laser under different temperature is monitored. During the temperature tuning from 14 °C to 40 °C the DW-DFB laser operates stably and the PDM, SMSR and wavelength spacing change slightly. The tuning range of the wavelength spacing is enlarged by changing both the chirp rate and phase shift, which is an important figure-of-merit for the dual-wavelength laser. This work provides a simple and cost-effective way to achieve dual-wavelength semiconductor laser.
Abstract:
A monolithic integrated dual-wavelength DFB semiconductor laser is fabricated and experimentally demonstrated. Utilizing the reconstruction-equivalent chirp (REC) technique, dual-wavelength lasing is obtained by introducing two symmetric equivalent phase shifts in a chirped sampled Bragg grating. The laser operates at 1650 nm and the wavelength spacing is about 0.8 nm at room temperature. The frequency of the beat signal between the two wavelengths is 88.47 GHz, and the linewidth of the beat signal is 5.1 MHz. Based on the REC technique, the grating pattern can be fabricated by using holographic exposure combining with conventional lithography. This work provides a simple and cost-effective way to achieve dual-wavelength semiconductor laser.
Published in: IEEE Journal of Quantum Electronics ( Volume: 58, Issue: 1, February 2022)