W-Band OFDM for Radio-over-Fiber Direct-Detection Link Enabled by Frequency Nonupling Optical Up-Conversion

Author

Alavi, S.E. ; Amiri, I.S. ; Khalily, M. ; Fisal, Norsheila ; Supa´at, Abu Sahmah M. ; Ahmad, Harith ; Idrus, S.M.

Author_Institution

Fac. of Electr. Eng., Univ. Teknol. Malaysia (UTM), Skudai, Malaysia

Volume

6

Issue

6

fYear

2014

fDate

Dec. 2014

Firstpage

1

Lastpage

7

Abstract

A system involving W-band (75-110 GHz) optical millimeter (mm)-wave generation using the external optical modulator (EOM) in a radio-over-fiber (RoF) link is presented for satisfying the requirements for multi-gigabit-per-second data rates. A 90-GHz mm-wave signal was generated by a nonupling (nine times) increase in only a 10-GHz local oscillator by biasing the EOM at its zero level and choosing an appropriate modulation index. To achieve a fast transmission speed wirelessly, high spectral efficiency (SE), and better transmission performance, orthogonal frequency-division multiplexing (OFDM) is used. The bit error rate (BER) and error vector magnitude (EVM) of the system were measured for three different fiber lengths and for a wireless distance of 1-5 m. The results show that the system with the SE of ~4 (b/s)/Hz and 16-ary quadrature amplitude modulation (QAM) 40-GB/s OFDM signals can be received by the end user with BER less than 3.8 × 10^-3 and EVM less than 25% over a 50-km optical fiber and 3-m wireless link.

Keywords

OFDM modulation; error statistics; optical communication equipment; optical frequency conversion; optical modulation; quadrature amplitude modulation; radio-over-fibre; 16-ary quadrature amplitude modulation; BER; EOM; EVM; OFDM; QAM; W-band OFDM; W-band optical millimeter wave generation; bandwidth 75 GHz to 110 GHz; bit error rate; distance 1 m to 50 km; error vector magnitude; external optical modulator; frequency nonupling optical up-conversion; high spectral efficiency; local oscillator; modulation index; orthogonal frequency division multiplexing; orthogonal frequency-division multiplexing; radio-over-fiber direct-detection link; transmission performance; wireless fast transmission speed; wireless link; Bit error rate; OFDM; Optical fibers; Optical modulation; Optical transmitters; Wireless communication; External Modulation; Orthogonal Frequency Division Multiplexing (OFDM); Radio-over-Fibre; W-band; external modulation; orthogonal frequency division multiplexing (OFDM); radio-over-fiber;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2366166

Filename

6945247