Combating/eliminating dispersion-induced fading using suppressed carrier link for OFDM signal

ABSTRACT

We investigate the performance of 20-GHz radio over fibre (RoF) system having orthogonal frequency division multiplexed (OFDM) as radio signal using two modulation techniques – balanced detection for intensity modulation direct detection (IMDD) and coherent heterodyne detection suppressed carrier (SC) modulation. Dispersion-induced power fading is seen in conventional IMDD links due to the dependence of dispersion over frequency-dependent refractive index of the fibre. SC link is seen to compensate the power fading by terminating the direct current and even-order harmonics with the suppression of carrier along with balanced detection.

KEYWORDS:

• OFDM
• power fading
• intensity modulation direct detection (IMDD)
• suppressed carrier (SC)

Disclosure statement

No potential conflict of interest was reported by the authors.