Linear frequency-swept DFB laser array used in sensing system

Xiaokun Li; Tao Fang; Xiangfei Chen

doi:10.1117/12.2573567

10 October 2020 Linear frequency-swept DFB laser array used in sensing system

Xiaokun Li, Tao Fang, Xiangfei Chen

Proceedings Volume 11545, Semiconductor Lasers and Applications X; 1154507 (2020) https://doi.org/10.1117/12.2573567
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

We propose and fabricate a linear frequency-swept DFB laser array based on the reconstructed-equivalent-chirp (REC) technique used in sensing system. During the fabrication process of the laser arrays, the reconstructed-equivalent-chirp technique is utilized to simplify the fabrication of the grating and precisely control the grating phase. A semiconductor optical amplifier (SOA) is monolithically integrated to enhance and balance the output optical power. The module achieves a wavelength range of more than 3 nm by covering 4 channels with an interval of 0.8 nm. The side mode suppression ratios (SMSRs) of all channels are above 50 dB and the output power are guaranteed above 10 dBm with the SOA providing 14 dBm saturation output power. To tune the wavelength on the microsecond scale, we adopt a combination of a MCU and a FPGA as the controlling core to turn on and off the driving current of all the 4 lasers on the DFB laser array, and the switching time between 2 channels is well controlled within 50 ns. At the same time, the module makes the wavelength output linearly with the current through the filter circuit, and achieves the sweep speed of 100 nm/s. This sweep speed, sweep range, output power, and good single-model performance meet the needs of sensing system for light sources.

Conference Presentation

Citation Download Citation

Xiaokun Li, Tao Fang, and Xiangfei Chen "Linear frequency-swept DFB laser array used in sensing system", Proc. SPIE 11545, Semiconductor Lasers and Applications X, 1154507 (10 October 2020); https://doi.org/10.1117/12.2573567

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