期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 2, 页码 465-474出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3032923
关键词
Optical mixing; Optical receivers; OFDM; Optical fibers; Optical attenuators; Optical filters; 5G; millimeter-wave communications; radio-over-fiber; optical heterodyning; fronthaul
资金
- Science Foundation Ireland (SFI) [18/EPSRC/3591, 18/SIRG/5579]
- European Regional Development Fund [13/RC/2077, 12/RC/2276]
- SFI US-Ireland Partnership Program [15/US-C2C/I3132]
- Irish Research Council
- French Ministry of Foreign Affairs
- VAJRA Faculty Programme of MHRD, Government of India
- Science Foundation Ireland (SFI) [18/EPSRC/3591] Funding Source: Science Foundation Ireland (SFI)
This study introduces three different techniques for compensating laser frequency offset and phase noise in an optical heterodyne A-RoF system. The successful transmission of a 1.95 MHz subcarrier spaced OFDM signal demonstrates the effectiveness of these compensation techniques.
Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mm-wave) wireless systems. The phase noise of the photo-generated mm-wave carrier limits the performance of such links, especially, for the transmission of low subcarrier baud rate multi-carrier signals. In this work, we present three different techniques for the compensation of the laser frequency offset (FO) and phase noise (PN) in an optical heterodyne A-RoF system. The first approach advocates the use of an analog mm-wave receiver; the second approach uses standard digital signal processing (DSP) algorithms, while in the third approach, the use of a photonic integrated mode locked laser (MLL) with reduced DSP is advocated. The compensation of the FO and PN with these three approaches is demonstrated by successfully transmitting a 1.95 MHz subcarrier spaced orthogonal frequency division multiplexing (OFDM) signal over a 25 km 61 GHz mm-wave optical heterodyne A-RoF link. The advantages and limitations of these approaches are discussed in detail and with regard to recent 5G recommendations, highlighting their potential for deployment in next generation wireless systems.
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