Performance Evaluation of Digital Coherent Receivers for Phase-Modulated Radio-Over-Fiber Links

Dept. of Photonics Eng., Tech. Univ. of Denmark, Lyngby, Denmark
Journal of Lightwave Technology (Impact Factor: 2.97). 12/2011; 29(21):3282 - 3292. DOI: 10.1109/JLT.2011.2167595
Source: IEEE Xplore


The performance of optical phase-modulated (PM) radio-over-fiber (RoF) links assisted with coherent detection and digital signal processing (PM-Coh) is analyzed and experimentally demonstrated for next-generation wireless-over-fiber systems. PM-Coh offers high linearity for transparent transport of high-frequency microwave signals, and better receiver sensitivity than intensity modulated with direct detection systems. By including photonic downconversion in the PM-Coh link, in a form of a pulsed free-running local oscillator, it is possible to receive high-RF carrier frequencies, with low-bandwidth electronics. Analytical assessment and simulations are used to determine the ultimate performance with respect to laser linewidth, modulation index, and receiver sensitivity. Then, two different scenarios are studied and experimentally demonstrated as an application of PM-Coh links: a high-capacity multiantenna RoF system (12 subcarriers of 400 Mb/s and 6 subcarriers of 800 Mb/s) and photonic downconversion for the detection of high-RF carriers microwave signals (up to 3.2 Gb/s at 40 GHz).

Download full-text


Available from: D. Zibar, Apr 08, 2014
57 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrate a technique for electrooptically upconverting and phase modulating digital data onto an RF carrier and performing coherent detection and downconversion of the received millimeter-wave signal to baseband. The binary phase-shift keyed RF signal is transmitted wirelessly to show its potential in wireless applications.
    Microwave Photonics (MWP), 2012 International Topical Meeting on; 01/2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: A bandpass sampling based digital coherent receiver is presented for phase modulated radio-over-fiber links with coherent detection. In the scheme, the bandpass sampling technique is introduced in RoF systems to overcome the high sampling rate requirement and front-end hardware dependency of conventional digtal coherent receivers. In particular, the selection rule of bandpass sampling rate was defined by taking into account the frequency offset induced by free-running optical local oscillator. Analytical assessment and simulations are used to determine the ultimate performance in terms of tolerances to ADC bit resolution and laser linewidth. Thereafter, a 40Mbps QPSK modulated data signal at 2.4GHz RF carrier frequency is experimentally demonstrated over the proposed 50.6-km radio-over-fiber link employing bandpass sampling.
    Optics Express 11/2014; 22(22). DOI:10.1364/OE.22.027007 · 3.49 Impact Factor