Summer School on Optics & Photonics Mitigating Transmitter Non-linearity and ... over Fiber... ·...
Transcript of Summer School on Optics & Photonics Mitigating Transmitter Non-linearity and ... over Fiber... ·...
Mitigating Transmitter Non-linearity and Fiber
Impairments in Radio over Fiber Technology
Dhananjay Patel
PhD student,
ECED, SVNIT, Surat
Supervisor:
Dr Mrs. U. D. Dalal
Associate Professor
ECED, SVNIT, Surat
Summer School on Optics & Photonics
National Institute of Technology, Surat, India
Outline
• RoF introduction
• Dispersion in optical fibers
• RoF OFDM transmission and reception using the
conventional and modified SSB
• Analysis of HD2 due to MZM, chromatic and modal
dispersion in SMF-MMF
• Conclusion and Future scope
• Publications
• References
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Introduction
• The increasing consumer demands to access the internet
requiring larger broadband network capacity should extend up
to the feed fixed terminals at the customer premises
• Single mode fibers (SMF) are typically used in Wide Area
Networks (WAN), Metropolitan Area Networks (MAN) and also
find applications in Radio over Fiber (RoF) architectures
supporting data transmission in Fiber to the Home (FTTH),
Remote Antenna Units (RAUs)
• Multi-mode fibers (MMFs) with low cost, ease of installation and
low maintenance are predominantly (85% to 90%) deployed in
in-building networks providing data access in local area
networks (LANs).5.6.2017 Summer school on optics and
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Radio over Fiber technology
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Signal Distortion on Optical Fibers -
Dispersion
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Types of dispersion
Intra modal or
Chromatic
dispersion
Inter modal
dispersion
Dispersion
Material
Dispersion
Waveguide
Dispersion
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Optical modulator - MZM
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System Setup
System Parameter Value
RF frequency 18 GHz
Laser power, Linewidth,
Wavelength
-2dBm, 10MHz,
1552nm
Switching voltage of MZM 4V
Bias voltage of MZM, Phase
shift
2V and 1.33V for
90 and 120
degrees
Fiber length, dispersion &
attenuation
Up to 25Kms,
16.75 ps/nm/km
and 0.2 db/km
PIN responsitivity 0.8 A/W5.6.2017 11
Optical Spectrum of conventional
OSSB and proposed OSSB
90о Hybrid Coupler 120о Hybrid Coupler5.6.2017 12
Effect of DC bias voltage on 2nd order sideband
optical power for modified OSSB
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dc
VV
Patel Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Assessment of Fiber Chromatic Dispersion
Based on Elimination of Second-Order Harmonics in Optical OFDM Single Sideband Modulation
Using Mach Zehnder Modulator." Fiber and Integrated Optics 35.4 (2016): 181-195.
dcV is the DC bias voltage andV is the MZM switching voltage
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Effect of ER on 2nd order sideband optical power
As ER increases from 5 to 25dB, the 2nd order optical SB power reduces
from -28.4 to -48.5dBm.
Patel, D., Singh, V. K., & Dalal, U. D. ,"Performance analysis of single sideband modulation technique using Mach
Zehnder Modulator based on different phase angles of electrical hybrid coupler, " Optik- International Journal
for Light and Electron Optics, vol.128,93–100, January 2017
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Optical OFDM generation,
transmission, and direct detection
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Mathematical modelingGeneration of the OFDM signal
Consideration of all the Laser and MZM parameters to generate the corresponding SSB OFDM signal
Taking Fourier Transform of the generated signal and expansion using the Bessel function
Transmission of the optical SSB signal through the SMF considering all the non-linear properties. Multiply the frequency transfer function of
dispersive and
nonlinear SMF with the optical SSB signal
Conversion of the received signal back to time domain by Inverse Fourier transform
Conversion of the optical signal back to electrical by multiplying the Responsitivity of the photodiode with the modulus squared of the optical
signal
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Optical spectrum of SSB signal using
90° hybrid coupler with ER = 6 dB
Optical spectrum of SSB signal using 90°
hybrid coupler with ER = 30 dB.
Optical spectrum of SSB signal using
120° hybrid coupler with ER = 6 dB
Optical spectrum of SSB signal using
120° hybrid coupler with ER = 30 dB.
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EVM analysis for 4 QAM OFDM transmission
Patel Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Assessment of Fiber Chromatic Dispersion Based on Elimination of Second-
Order Harmonics in Optical OFDM Single Sideband Modulation Using Mach Zehnder Modulator." Fiber and Integrated Optics 35.4
(2016): 181-195.
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EVM analysis for 16 QAM OFDM transmission
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EVM analysis for 64 QAM OFDM transmission
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OFDM drive power and MZM non-
linearity
Linear
RegionNon - Linear
Region
Threshold point
= 9.98dBm5.6.2017 21
EVM vs received optical power
ECMA threshold= -
14.5dB
Improvement in
receiver sensitivity =
4.77%
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Generation of m-QAM OFDM signal
and transmission through SMF-MMF
fiber link
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Mathematical modelingThe output optical signal from the SMF is multiplied with the transfer function
of the MMF
Conversion of the optical signal back to electrical by multiplying the Responsitivity of the photodiode with the modulus squared of the optical
signal
Differentiating the current equation in to two parts based on normalized field distribution in same mode and in neighboring modes
Expanding the current equation up to second order where one part represents the HD2 due to MZM non linearity and other part represents HD2 due to modal
dispersion of the MMF
The Equation can be split into three parts considering the beating components formed due to beating of carrier and the first-order harmonic , carrier and the second-
order harmonic , first-order and the second-order harmonic for both the MZM and modal dispersion
The HD2 is calculated individually for MZM non linearity and modal noise by using Total Harmonic Distortion formula
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Influence of the modulation index on
HD2 on conventional SSB
Optical spectrum of the SSB technique with 90° hybrid coupler for different MZM
modulation index.
(a) MI = 0.1 (b) MI = 0.5 (c) MI = 1
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Optical spectrum of the SSB technique with 120° hybrid coupler for different MZM
modulation index.
Influence of the modulation index on
HD2 on modified SSB
(a) MI = 0.1 (b) MI = 0.5 (c) MI = 1
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Effect of HD2 due to MZM non-linearity and modal
dispersion over different MMF length
At length 500m, the SSB
with 120° hybrid coupler
provides a suppression of
the HD2 by 12 dB more
than the conventional one.
Patel Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Analysis of second order harmonic
distortion due to transmitter non-linearity and chromatic and modal dispersion of optical OFDM SSB
modulated signals in SMF-MMF fiber links." Optics Communications 383 (2017): 294-303
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Conclusion and future scope
• The optimum OFDM drive power is calculated for all the MZM
modulation techniques such that the MZM non-linearity is
minimum.
• The SSB technique using the 120° hybrid coupler improves the
receiver sensitivity as compared to the all other MZM
modulation techniques.
• Problems of chromatic dispersion, modal dispersion is reduced
by employing SSB technique using the 120° hybrid coupler in
SMF and MMF fibers.
• The SSB technique using the 120° hybrid coupler can be
employed in bidirectional systems to reduce the impact of
Rayleigh backscattering and discrete reflections5.6.2017 Summer school on optics and
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Publications
1. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Performance evaluation of
optical OFDM in direct detected systems based on MZM bias and drive
voltages." Telecommunication Systems (2017): 1-11. Springer
2. Patel, Dhananjay, and U. D. Dalal. "A novel wavelength reused bidirectional RoF-
WDM-PON architecture to mitigate reflection and Rayleigh backscattered noise in
multi-Gb/s m-QAM OFDM SSB upstream and downstream transmission over a
single fiber." Optics Communications 390 (2017): 26-35. Elsevier
3. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Analysis of second order
harmonic distortion due to transmitter non-linearity and chromatic and modal
dispersion of optical OFDM SSB modulated signals in SMF-MMF fiber links." Optics
Communications 383 (2017): 294-303. Elsevier
4. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Performance analysis of
single sideband modulation technique using Mach Zehnder Modulator based on
different phase angles of electrical hybrid coupler." Optik-International Journal for
Light and Electron Optics 128 (2017): 93-100. Elsevier5.6.2017 Summer school on optics and
photonics, Oulu, Finland
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5. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Assessment of fiber
chromatic dispersion based on elimination of second-order harmonics in optical
OFDM single sideband modulation using Mach Zehnder Modulator." Fiber and
Integrated Optics 35.4 (2016): 181-195. Taylor & Francis
6. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Chirped and Chirped Free
Optical OFDM MMW Generation with Direct Detection to Overcome Fiber
Chromatic Dispersion and MZM Non Linearity." Journal of Optoelectronics and
Advance Materials (JOAM), (in press).
7. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Assessment of the DC Bias
to Mitigate the Clipping Noise in DCO-OFDM, ACO-OFDM; and Non-linear
Distortion of DFB Laser Transmitted through Dispersive Single Mode Fibers in
IM/DD Systems." Wireless Personal Communications,
(2017).doi:10.1007/s11277-017-4170-y. Springer
8. Patel, Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "On the effect of the
extinction ratio and the modulation index on optical up conversion using DSBSC
modulation and transmitting over different fiber links." Optik-International Journal
for Light and Electron Optics 127.24 (2016): 11845-11853. Elsevier5.6.2017 Summer school on optics and
photonics, Oulu, Finland
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9. Dhananjay Patel & U. D. Dalal. "System Design and Analysis of a Novel
Wavelength Reused High Speed Bidirectional ROF-WDM-PON Architecture using a
M-QAM OFDM SSB Modulation Technique to Mitigate Chromatic Dispersion,
Reflection and Rayleigh Backscattering over a Single Mode Fiber." OSA and SPIE
sponsored International conference on “Development in optics and
communication- DOCRIGA 2017”, at Riga Latvia (2017).
10. Patel Dhananjay, Vinay Kumar Singh, and U. D. Dalal. "Performance Analysis of
Optical Double Sideband and Optical Single Sideband Generation using Mach
Zehnder Modulator Chirp and Extinction Ratio over Different Fiber Link." In 2nd
IEEE International Conferences For Convergence of Technology (I2ct), Pune,
India.
11. Patel Dhananjay, Vinay Kumar Singh, and U. D. Dalal. " Performance Evaluation of
a Single Mode-Multi Mode Cost Efficient Fiber Link used for 4/16/64 QAM Gigabit
OFDM MMW Transmission using Different MZM Modulation Schemes." In 2nd
IEEE International Conferences For Convergence of Technology (I2ct), Pune,
India.5.6.2017 Summer school on optics and
photonics, Oulu, Finland
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References
[1] Chowdhury, A.; Hung-Chang Chien; Yu-Ting Hsueh; Gee-Kung Chang, "Advanced System Technologies and
Field Demonstration for In-Building Optical-Wireless Network With Integrated Broadband Services,"
in Lightwave Technology, Journal of , vol.27, no.12, pp.1920-1927, June15, 2009
[2] Gee-Kung Chang; Chowdhury, A.; Zhensheng Jia; Hung-Chang Chien; Ming-Fang Huang; Jianjun Yu; Ellinas,
G., "Key Technologies of WDM-PON for Future Converged Optical Broadband Access Networks [Invited],"
in Optical Communications and Networking, IEEE/OSA Journal of , vol.1, no.4, pp.C35-C50, September 2009
[3] Beas, J.; Castanon, G.; Aldaya, I.; Aragon-Zavala, A.; Campuzano, G., "Millimeter-Wave Frequency Radio over
Fiber Systems: A Survey," in Communications Surveys & Tutorials, IEEE , vol.15, no.4, pp.1593-1619, Fourth
Quarter 2013
[4] Ming-Fang Huang; Jianjun Yu; Zhensheng Jia; Gee Kung Chang, "Simultaneous Generation of Centralized
Lightwaves and Double/Single Sideband Optical Millimeter-Wave Requiring Only Low-Frequency Local
Oscillator Signals for Radio-Over-Fiber Systems," in Lightwave Technology, Journal of , vol.26, no.15,
pp.2653-2662, Aug.1, 2008
[5] Barros, D.J.F.; Kahn, J.M., "Comparison of Orthogonal Frequency-Division Multiplexing and On-Off Keying in
Amplified Direct-Detection Single-Mode Fiber Systems," in Lightwave Technology, Journal of , vol.28, no.12,
pp.1811-1820, June15, 2010
[6] Schmidt, B.; Lowery, A.J.; Armstrong, J., "Experimental Demonstrations of Electronic Dispersion Compensation
for Long-Haul Transmission Using Direct-Detection Optical OFDM," in Lightwave Technology, Journal of ,
vol.26, no.1, pp.196-203, Jan.1, 2008
[7] Min Xue; Shilong Pan; Yongjiu Zhao, "Optical Single-Sideband Modulation Based on a Dual-Drive MZM and a
120° Hybrid Coupler," in Journal of Lightwave Technology, vol.32, no.19, pp.3317-3323, Oct.1, 1 2014
[8] M. Xue, Y. J. Zhao, X. W. Gu, and S. L. Pan, “Performance analysis of optical vector analyzer based on optical
single-sideband modulation,” J. Opt. Soc. Amer. B, vol. 30, pp. 928–933, 2013.5.6.2017 Summer school on optics and
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Thank you for the patience