| Autor: |
S. Boudreau, R. Korn, A. Babin, P. Chrétien, O. Kern, A. Desbiens, S. Ayotte, Michel Morin, E. Baumgart, É. Girard-Deschênes, F. Costin, L. P. Perron, M. Wichmann, N. Caspers, G. Paré-Olivier, K. Bédard |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Photonic Instrumentation Engineering VIII. |
| DOI: |
10.1117/12.2578594 |
| Popis: |
Monolithic distributed feedback semiconductor lasers (1550 nm) for FMCW LiDAR applications have been designed, fabricated and tested. The strong optical frequency modulation distortion observed when a standard DFB laser is modulated with a triangular current waveform is significantly mitigated in our laser. A 100 kHz frequency modulation with amplitude of 0.9 GHz and nonlinear distortion of 0.3%, calculated as the standard deviation of the optical frequency after removal of a linear fit, was measured through an unbalanced fiber interferometer. This was achieved without electronic pre-distortion of the triangular waveform. The 60 kHz intrinsic linewidth of the laser was unaffected by the modulation. Two lasers were co-packaged in a 2.6 cm3 multi-layer ceramic package and coupled to fiber pigtails with micro-lenses. The pins of the ceramic package were soldered to a printed circuit board containing the current sources driving the lasers. This optical source was used in a two-channel LiDAR demonstrator built from off-the-shelf fiber optic components and a twodimensional gimbal scanning mirror. This demonstrator enabled detecting a target with 10 % Lambertian reflectivity up to a distance of >120 m and recording point clouds of different scenes. This shows that FMCW LiDAR in combination with highly coherent and linear DFB laser sources is a very promising technology for long range sensing. A version under development will include a silicon photonics chip for further integration and functionality including I/Q detection. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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