Tunable dual-frequency coherent Doppler lidar using bi-directional electro-optic modulation in a Sagnac loop

Wang, Lu; Zhao, Lijie; Zhang, Yunpeng; Wu, Yuqi; Xia, Haiyun

doi:10.1016/j.optcom.2022.128852

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…The precision of the differential Doppler shift (DDS) measurement can reach a sub-Hertz level when the laser modes are synchronized using an external Radio Frequency (RF) source [9,10]. The two laser modes can be obtained through various methods, such as electro-optical modulation sidebands [11,12], injection-locked semiconductor laser's period oscillation modes [13], or the dual modes of a monolithically integrated dual-mode amplified feedback laser [10]. Alternatively, dual-frequency laser can also be obtained by filtering two modes from a multimode laser, such as mode locked laser (MLL) [14].…”

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Doppler Velocimetry Based on a Mode-Locked Distributed Bragg Reflector Laser

Song,

Lu,

Zhang

et al. 2023

Photonics

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A differential multi-frequency laser Doppler velocimetry is demonstrated, utilizing the synchronized multimode of a mode-locked distributed Bragg reflector laser. This scheme enables the simultaneous detection of multiple Doppler frequency shifts. Multiple differential Doppler shifts of 0.6 Hz, 1.3 Hz, and 1.9 Hz are obtained, with an average speed of 3.677 mm/s and a standard deviation of 0.122 mm/s, demonstrating a cross-referenced velocity measurement capability. The measurement results are also compared with the dual-frequency laser Doppler velocimetry scheme using electro-optical modulation.

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Section: Introductionmentioning

confidence: 99%

Multi-Frequency Doppler Velocimetry Based on a Mode-Locked Distributed Bragg Reflector Laser

Song,

Lu,

Zhang

et al. 2023

Photonics

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Differential Doppler Velocity Measurement Using a Distributed Bragg Reflector Mode-Locked Laser

Song,

Lu,

Zhang

et al. 2023

2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings (ACP/POEM)

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Modeling and application of a bidirectional Mach–Zehnder electro-optic modulator with enhanced high-frequency modulation efficiency

Ma,

Ou,

Qian

et al. 2024

Appl. Opt.

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We present a simple way to enhance bidirectional broadband modulation in a traveling wave Mach–Zehnder electro-optic modulator (EOM) by removing matched impedance and effecting a reflection of the microwave signal. A model was devised for determining the modulation efficiency (ME) in the presence of microwave reflection, without access to the physical parameters of the EOM. By using the model, the simulated MEs matched well with the measured ones, which verified the correctness of the model and demonstrated that the internal parameters of the modulator could be inferred from the model. Compared with the traditional unidirectional EOM, the measured ME of the bidirectional modulator for the optical signal that counter-propagates with the incident microwave signal was improved by 10 times at least. When the velocities of microwave and optical signals were matched, the MEs at the frequency higher than 3.3 GHz were further improved. Our model was also used to derive the optical interference signal utilizing bidirectional modulation. It was found that the signal intensity was enhanced significantly, and further improved after introducing the velocity match. This work can be expected to open up many microwave photonics applications where bidirectional optical modulation is utilized in novel sensing and metrology.

show abstract

Tunable dual-frequency coherent Doppler lidar using bi-directional electro-optic modulation in a Sagnac loop

Cited by 3 publications

References 20 publications

Multi-Frequency Doppler Velocimetry Based on a Mode-Locked Distributed Bragg Reflector Laser

Multi-Frequency Doppler Velocimetry Based on a Mode-Locked Distributed Bragg Reflector Laser

Differential Doppler Velocity Measurement Using a Distributed Bragg Reflector Mode-Locked Laser

Modeling and application of a bidirectional Mach–Zehnder electro-optic modulator with enhanced high-frequency modulation efficiency

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