Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System

Thavamaran Kanesan; Wai Pang Ng; Zabih Ghassemlooy; Chao Lu

doi:10.1364/JOCN.6.000008

Journal of Optical Communications and Networking
Vol. 6,
Issue 1,
pp. 8-17
(2014)
•https://doi.org/10.1364/JOCN.6.000008

Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System

Thavamaran Kanesan, Wai Pang Ng, Zabih Ghassemlooy, and Chao Lu

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Thavamaran Kanesan, Wai Pang Ng, Zabih Ghassemlooy, and Chao Lu, "Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System," J. Opt. Commun. Netw. 6, 8-17 (2014)

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About this Article
History
- Original Manuscript: April 30, 2013
- Revised Manuscript: September 9, 2013
- Manuscript Accepted: October 11, 2013
- Published: December 10, 2013

Abstract

In this paper, we experimentally demonstrate the seamless integration of full duplex system frequency division duplex (FDD) long-term evolution (LTE) technology with radio over fiber (RoF) for eNodeB (eNB) coverage extension. LTE is composed of quadrature phase-shift keying (QPSK), 16-quadrature amplitude modulation (16-QAM) and 64-QAM, modulated onto orthogonal frequency division multiplexing (OFDM) and single-carrier-frequency division multiplexing for downlink (DL) and uplink (UL) transmissions, respectively. The RoF system is composed of dedicated directly modulated lasers for DL and UL with dense wavelength division multiplexing (DWDM) for instantaneous connections and for Rayleigh backscattering and nonlinear interference mitigation. DL and UL signals have varying carrier frequencies and are categorized as broad frequency spacing (BFS), intermediate frequency spacing (IFS), and narrow frequency spacing (NFS). The adjacent channel leakage ratio (ACLR) for DL and UL with 64-QAM are similar for all frequency spacings while cross talk is observed for NFS. For the best case scenario for DL and UL transmissions we achieve error vector magnitude (EVM) values of $\sim 2.30 %$ , $\sim 2.33 %$ , and $\sim 2.39 %$ for QPSK, 16-QAM, and 64-QAM, respectively, while for the worst case scenario with a NFS EVM is increased by 0.40% for all schemes.

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Parameters	Values
SCM modulations	QPSK, 16-QAM, and 64-QAM
Bit rate ( $Mb / s$ )	33, 66, and 100
Signal bandwidth (MHz)	20
RF power (dBm)	2 to $- 10$
DFB bias (mA)	60
DFB bandwidth	2.7 GHz
SMF (km)	10
PD responsivity	0.42
PD bandwidth	50 GHz
LNA-gain; NF (dB)	18; 2.5
	DL	UL
MCM modulations	OFDM	SC-FDM
FFT/IFFT size	NA/2048	$1024 / 2048$
PAPR (dB)	11.16, 11.3, and 11.67	7.59, 7.71, and 7.86
Carrier frequencies (GHz)	2.62–2.69	2.5–2.57
Optical power (dBm)	1.06	1.19
Relative intensity noise (dB/Hz)	$- 149.6$	$- 151.219$
Optical wavelength (nm)	1551.11	1550.31

$f_{DL}$	$f_{UL}$	Frequency Spacing
2.69 GHz	2.5 GHz	190 MHz (Broad)
2.69 GHz	2.57 GHz	120 MHz (Intermediate)
2.62 GHz	2.57 GHz	50 MHz (Narrow)

Frequency Spacing	ACLR Penalty: $S_{RFDL} (t)$	ACLR Penalty: $S_{RFUL} (t)$
50 MHz	14.16 dB	14.12 dB
120 MHz	0.69 dB	0.6 dB
190 MHz	Negligible	Negligible

Interfering Signal Power	$S_{RFDL} (t)$	$S_{RFUL} (t)$
2 dBm; $- 10 dBm$	2 dBm: $\sim 2.67 %$ ; $\sim 2.26 %$	2 dBm: $\sim 2.64 %$ ; $\sim 2.26 %$
2 dBm; $- 10 dBm$	$- 10 dBm$ : $\sim 11.92 %$ ; $\sim 11.55 %$	$- 10 dBm$ : $\sim 11.9 %$ ; $\sim 11.47 %$

Parameters	Values
SCM modulations	QPSK, 16-QAM, and 64-QAM
Bit rate ( $Mb / s$ )	33, 66, and 100
Signal bandwidth (MHz)	20
RF power (dBm)	2 to $- 10$
DFB bias (mA)	60
DFB bandwidth	2.7 GHz
SMF (km)	10
PD responsivity	0.42
PD bandwidth	50 GHz
LNA-gain; NF (dB)	18; 2.5
	DL	UL
MCM modulations	OFDM	SC-FDM
FFT/IFFT size	NA/2048	$1024 / 2048$
PAPR (dB)	11.16, 11.3, and 11.67	7.59, 7.71, and 7.86
Carrier frequencies (GHz)	2.62–2.69	2.5–2.57
Optical power (dBm)	1.06	1.19
Relative intensity noise (dB/Hz)	$- 149.6$	$- 151.219$
Optical wavelength (nm)	1551.11	1550.31

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Journal of Optical Communications and Networking