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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

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Front Optoelec    2012, Vol. 5 Issue (2) : 187-194    https://doi.org/10.1007/s12200-012-0231-8
RESEARCH ARTICLE
Simplified adaptively modulated optical OFDM modems using subcarrier modulation with added input/output reconfigurability
Xing ZHENG, Jinlong WEI, Roger Philip GIDDINGS, Jianming TANG()
School of Electronic Engineering, Bangor University, Bangor, LL57 1UT, UK
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Abstract

Three novel designs of adaptively modulated optical orthogonal frequency division multiplexing modems using subcarrier modulation (AMOOFDM-SCM) are proposed, for the first time, each of which requires a single inverse fast Fourier transform/fast Fourier transform (IFFT/FFT) operation. These designs not only significantly simplify the AMOOFDM-SCM modem configurations, but also offer extra unique network features such as input/output reconfigurability. Investigations show that these three modems are capable of supporting more than 60 Gb/s AMOOFDM-SCM signal transmission over 20, 40 and 60 km single mode fibre (SMF)-based intensity modulation and direct detection (IMDD) transmission links without optical amplification and chromatic dispersion compensation.
Keywords orthogonal frequency division multiplexing (OFDM)      subcarrier modulation (SCM)      single mode fibre (SMF)     
Corresponding Author(s): TANG Jianming,Email:j.tang@bangor.ac.uk   
Issue Date: 05 June 2012
 Cite this article:   
Xing ZHENG,Jinlong WEI,Roger Philip GIDDINGS, et al. Simplified adaptively modulated optical OFDM modems using subcarrier modulation with added input/output reconfigurability[J]. Front Optoelec, 2012, 5(2): 187-194.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0231-8
https://academic.hep.com.cn/foe/EN/Y2012/V5/I2/187
Fig.1  Schematic illustration of RS III modem configuration and corresponding transmission link structure. Mod: modulation; IM: intensity modulator; Atten.: attenuator; PD: photodetector; DeMod: demodulation; FPGA: field programmable gate array; DAC/ADC: digital-to-analogue converter/analogue-to-digital converter; LPF: low-pass filter
Fig.2  Signal spectra of proposed RS modems. USB: upper sideband spectrum of SCM subcarrier; LSB: lower sideband spectrum of SCM subcarrier. (a) RS I; (b) RS II; (c) RS III
Fig.3  Illustration of generation of pure real-valued symbols and pure imaginary-valued symbols
Fig.4  Optimum SCM subcarrier frequencies for different modem designs. RS: reconfigurable modem; AS: conventional AMOOFDM-SCM scheme. (a) Transmission performance as function of for RS (AS) scheme II and III; (b) transmission performance as function of for RS (AS) scheme I, II and III
Fig.5  Signal transmission capacity versus reach performance of different modem designs. RS: reconfigurable modem; AS: AMOOFDM-SCM scheme
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