期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 9, 页码 2949-2955出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3054180
关键词
Optical pulses; Modulation; Laser mode locking; Optical fiber sensors; Optical reflection; Optical polarization; Optical interferometry; Fourier domain mode locked laser; time domain modulation; optical coherence tomography
资金
- National Key R&DProgram of China [2020YFB1805901]
- Shenzhen Science and Technology Innovation Commission [SGDX2019081623060558]
- Research Grant Council of Hong Kong SAR [PolyU152241/18E]
- Hong Kong Polytechnic University [1-BBAJ, 1-ZVGB]
The article introduces a novel discrete FDML laser with intracavity optical intensity modulation, which can generate swept signals with comb lines uniformly distributed in the frequency domain and achieve generating discrete k-space uniform swept signals with different FSRs and pulse durations.
Frequency comb swept lasers or wavelength stepped swept lasers with comb filters have been proposed in optical domain subsampling or circular-ranging optical coherence tomography (OCT) to achieve high axial scan rate and extended imaging range with a given acquisition bandwidth. However, the comb filters lack flexibility in varying the free spectral range (FSR). In this article, we propose and demonstrate a novel discrete Fourier domain mode locked (FDML) laser by using intracavity optical intensity modulation. Swept signals with comb lines uniformly distributed in the frequency domain is generated with tailor-made pulse patterns according to the sweep trace of the swept filter. Discrete k-space uniform swept signals with different FSRs and pulse durations are generated in the same laser. The FDML laser discretized by temporal modulation is more stable than that with a comb filter. The discrete FDML lasers will be potential sources of OCT and the fast-developing swept source LiDAR.
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