Sub-cycle QAM modulation for VCSEL-based optical fiber links | Zendy

Tien-Thang Pham | Zendy; Roberto Rodes | Zendy; Jesper Bevensee Jensen | Zendy; Connie J. Chang-Hasnain | Zendy; Idelfonso Tafur Monroy | Zendy

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Sub-cycle QAM modulation for VCSEL-based optical fiber links

Author(s) -

Tien-Thang Pham,

Roberto Rodes,

Jesper Bevensee Jensen,

Connie J. Chang-Hasnain,

Idelfonso Tafur Monroy

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.001830

Subject(s) - quadrature amplitude modulation , subcarrier , optics , qam , symbol rate , bandwidth (computing) , pulse amplitude modulation , modulation (music) , transmission (telecommunications) , materials science , intensity modulation , analog transmission , optoelectronics , telecommunications , phase modulation , physics , computer science , orthogonal frequency division multiplexing , bit error rate , phase noise , digital signal , channel (broadcasting) , acoustics , detector , pulse (music)

QAM modulation utilizing subcarrier frequency lower than the symbol rate is both theoretically and experimentally investigated. High spectral efficiency and concentration of power in low frequencies make sub-cycle QAM signals attractive for optical fiber links with direct modulated light sources. Real-time generated 10-Gbps 4-level QAM signal in a 7.5-GHz bandwidth utilizing subcarrier frequency at a half symbol rate was successfully transmitted over 20-km SMF using an un-cooled 1.5-µm VCSEL. Only 2.5-dB fiber transmission power penalty was observed with no equalization applied.

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