A code-free optical undersampling technique for broadband microwave spectrum measurement
- Resource Type
- Conference
- Authors
- Gao, Guangyu; Xiang, Xueshuang; Liang, Qijun; Liu, Naijin
- Source
- 2018 Asia Communications and Photonics Conference (ACP) Asia Communications and Photonics Conference (ACP), 2018. :1-3 Oct, 2018
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Photonics and Electrooptics
Signal Processing and Analysis
Optical pulses
Photonics
Optical filters
Phase modulation
High-speed optical techniques
Optical modulation
Optical sensors
optical undersampling
homodyne detection
microwave spectrum measurement
- Language
A novel broadband microwave (MW) spectrum measurement (BMSM) scheme based on code-free optical under-sampling and homodyne detection is proposed. The fully analog generation of optical pulses with a far-less-than-Nyquist rate is only through modulating cascaded electrooptical modulators by a single RF tone instead of any high-speed coding sequence modulation. Homodyne detection will reduce the analysis bandwidth of BMSM and enhance the detection performance of weak signal. A multi-band signal with 20 GHz spectral range and SNR = 61 dB is used to investigate the BMSM performance of this scheme, and the results show good performance for BMSM. The potentials for further optimization in practice are also discussed.