Multi-channel wavelength-swept DFB laser array based on REC technique

Ji Dai; Zhen Li; Pan Dai; Tao Fang; Feng Wang; Xiangfei Chen

doi:10.1117/12.2602238

9 October 2021 Multi-channel wavelength-swept DFB laser array based on REC technique

Ji Dai, Zhen Li, Pan Dai, Tao Fang, Feng Wang, Xiangfei Chen

Proceedings Volume 11902, Real-time Photonic Measurements, Data Management, and Processing VI; 119021H (2021) https://doi.org/10.1117/12.2602238
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

Wavelength-swept laser is one of the most critical common components of fiber Bragg grating (FBG) sensors. However, a fast, stable, integrated and low-cost multi-channel wavelength-swept laser array is still unavailable. In this article, a multi-channel simultaneous wavelength-swept DFB laser array based on the reconstruction-equivalent-chirp (REC) technique is proposed and manufactured. The REC technology simplifies the fabrication process and greatly reduces the cost of the laser. The laser array contains 4 lasers in parallel with integrated heating resistance for thermal tuning to broaden the wavelength-tuning range. Each single-wavelength DFB laser introduces a π-phase shift structure, which is used to improve the single-mode performance of the laser. Meanwhile, the active multiplexer responsible for coupling and an optical amplifier (SOA) responsible for compensating the coupling loss of the laser are also integrated on the same chip. The driving circuits of the laser use FPGA to control the DAC chip to obtain precise current output and realizes continuous linear output of wavelength by changing the injection current size. The packaged laser module can realize a continuous wavelength-swept range of 2.4 nm per channel with the SMSR over 40 dB, achieving a simultaneous sweep of four channels with good scanning linearity and scanning speed. The work of this paper realizes the integration of linear wavelength-swept light sources, which creates the conditions for a low-cost, small-volume multi-channel sensing system in the future.

Citation Download Citation

Ji Dai, Zhen Li, Pan Dai, Tao Fang, Feng Wang, and Xiangfei Chen "Multi-channel wavelength-swept DFB laser array based on REC technique", Proc. SPIE 11902, Real-time Photonic Measurements, Data Management, and Processing VI, 119021H (9 October 2021); https://doi.org/10.1117/12.2602238

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