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The Tradeoff Between Bit Error Rate and Optical Link Distance Using Laser Phase Noise Fixing Process in Coherent Optical OFDM Systems

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Abstract

Orthogonal frequency division multiplexing (OFDM) is a suitable solution thanks to its many advantages known in wireless communications. On the other hand, optical communications is also used as a backbone to transmit and receive large data rates with economical and good performance. Recently, fiber optical communication and OFDM method have been combined to obtain both advantages in a communication link called Coherent Optical OFDM (CO-OFDM). In this study, Bit error rate (BER) versus distance variations are investigated for a constant signal to noise ratio in CO-OFDM systems. Results also show the performance of the CO-OFDM system at different data rates and distances for one RF carrier and one optical carrier. So far, the Telecommunication Standardization Sector standards have suggested 81 channels between 192.1 and 196.1 THz in C band. Extending the number of channels using 111 more channels between 185.9 and 191.4 THz in L band where optical amplifiers and laser sources are available, the total number of channels reaches up to 192. In this research, CO-OFDM technique is modeled and simulated designing a Monte Carlo simulation. Dense wavelength division multiplexing (DWDM) is the key factor to obtain 3 Tb/s (192*16 Gb/s) utilizing only one optical cable by covering whole C and L bands. To the best of our knowledge, this work shows the first BER versus Distance variations in a CO-OFDM communication link for 3 Tb/s.

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Abbreviations

arg :

Symbol phase angle

BER:

Bit Error Rate

BPSK:

Binary Phase Shift Keying

c:

Light velocity in vacuum

CO-OFDM:

Coherent Optical OFDM

D t :

Chromatic Dispersion Parameter

FFT:

Fast Fourier Transform

f LD :

Laser frequency

f n :

nth subcarrier of OFDM symbol

f S :

Sampling frequency

GI:

Guard interval

GVD:

Group velocity dispersion

IDFT:

Inverse Discrete Fourier Transform

IFFT:

Inverse Fast Fourier Transform

h n :

Transfer function of nth component owing to the GVD

ICI:

Inter carrier Interference

ISI:

Inter-symbol Interference

L:

Link distance

Lmax :

Maximum Link Distance

MCM:

Multi carrier modulation

MZM:

Mach Zehnder Modulator

n :

Refractive index

n mn :

The noise component of nth subcarrier of mth symbol

NSC :

The number of OFDM subcarrier

NSD :

The number of OFDM data subcarrier

NSP :

The number of OFDM pilot subcarrier

OFDM:

Orthogonal Frequency Division Multiplexing

OOK:

On-Off Keying

RF:

Radio Frequency

RoF:

Radio over Fiber

RTO:

RF to Optical Modulation

SNR:

Signal to Noise Ratio

SSMF:

Standart Single Mode Fiber

T CP :

Cycle Prefix duration

T S :

Sampling period

T SYM :

OFDM symbol duration

T U :

Useful symbol duration

v :

Light velocity in fiber optical cable

\({c_{mn}^-}\) :

Estimated nth subcarrier of mth symbol at receiver output

c mn :

nth subcarrier of mth symbol at transmitter output

\({c_{mn}^\prime}\) :

nth subcarrier of mth symbol at receiver input

\({c_{\it mn}^{\it fs}}\) :

nth subcarrier of mth symbol after laser phase noise compensation at receiver

\({\bar{{\varphi }}_m }\) :

Estimated total phase drift for mth OFDM symbol

\({\varphi _m}\) :

Phase drift for mth OFDM symbol

\({\varphi_n }\) :

nth subcarrier phase component of OFDM symbol

\({\varphi_{\it LD}}\) :

Phase drift of the Laser diode

\({\varphi_{D}\left( n \right)}\) :

Phase dispersion of nth subcarrier because of Chromatic dispersion

Δf :

Subcarrier spacing

ΔG :

Guard interval length

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Authors and Affiliations

  1. Department of Electrical-Electronics Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Ayhan Yazgan & I. Hakkı Cavdar

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  1. Ayhan Yazgan
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  2. I. Hakkı Cavdar
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Correspondence to Ayhan Yazgan.

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Yazgan, A., Cavdar, I.H. The Tradeoff Between Bit Error Rate and Optical Link Distance Using Laser Phase Noise Fixing Process in Coherent Optical OFDM Systems. Wireless Pers Commun 68, 907–919 (2013). https://doi.org/10.1007/s11277-011-0489-y

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