4.5 Article

Dual-Output Microwave Photonic Frequency Up- and Down-Converter Using a 90° Optical Hybrid Without Filtering

Journal

IEEE PHOTONICS JOURNAL
Volume 14, Issue 4, Pages -

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3181031

Keywords

Frequency conversion; Optical filters; Optical imaging; Frequency modulation; Optical modulation; Microwave filters; Modulation; Frequency conversion; image reject mixer; microwave photonics; optical hybrid; optical signal processing

Funding

  1. National Natural Science Foundation of China [61690195]
  2. Fund of State Key Laboratory of IPOC [IPOC2018ZT09]

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A dual-output microwave photonic frequency up- and down-converter using a 90 degrees optical hybrid without filtering is proposed. The structure combines different modulators and hybrids to achieve signal conversion and image rejection. Simulations show that the structure has a wide tuning range and high suppression ratios for unwanted signals and images.
A dual-output microwave photonic frequency up- and down-converter using a 90 degrees optical hybrid without filtering is proposed. By using a dual-parallel Mach-Zehnder modulator and a Mach-Zehnder modulator in parallel to realize carrier suppressed single sideband and carrier suppressed double sideband modulation, respectively, with a 90 degrees optical hybrid and 90 degrees electrical hybrid coupler, this scheme can implement two functions: simultaneous up- and down-conversion signal generation, or high image rejection in down-conversion. Simulation results show that the proposed structure can achieve an up-conversion with a tunable range of 17-23 GHz or a down-conversion with a tunable range of 1-7 GHz, respectively, based on a fixed 8 GHz LO signal. The unwanted signal suppression ratio of desired signal is about 27.2 dB for up-conversion and 30.0 dB for down-conversion. In addition, we have tested and analyzed the conversion gain, noise figure and spurs free dynamic range of the system. For image rejection in down-conversion, we can achieve an image rejection ratio (IRR) about 65.2 dB. Moreover, the impact of the phase drift, RF frequency, amplitude and phase variation on IRR is discussed. Finally, the influence of half-voltage imbalance of the DPMZM sub-modulators on IRR is analyzed, and a compensation method is given.

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