Optics and Photonics Journal

Volume 7, Issue 5 (May 2017)

ISSN Print: 2160-8881   ISSN Online: 2160-889X

Google-based Impact Factor: 0.85  Citations  

Investigation of Tolerable Laser Linewidth for Different Modulation Formats in CO-OFDM Systems

HTML  XML Download Download as PDF (Size: 3856KB)  PP. 92-100  
DOI: 10.4236/opj.2017.75009    1,726 Downloads   3,087 Views  Citations

ABSTRACT

The ideal behavior of communication system requires a single frequency carrier. In optical communication system, light is used as a carrier. Practical laser source has a finite linewidth due to variations in the frequency of operation, hence, resulting in undesired phase perturbations in the signal whereas the ideal requirement is the delta function spectral shape at the carrier frequency. The spectral shape gets broadened due to phase noise and is modeled as lorentzian shape. Linewidth is a measure of stability of laser phase noise with time. Coherent Optical Orthogonal frequency division multiplexing (CO-OFDM) along with the spectrally efficient Quadrature Amplitude Modulation (QAM) formats is emerging as one of the best solutions for future high speed fiber transmission systems. Though the coherent, receivers have advantages in terms of sensitivity and selectivity, laser phase noise is the main limitation of such systems as the laser phase noise further causes common phase rotation of all the subcarriers per symbol and also results in inter carrier interference. QAM formats are also susceptible to laser phase noise. Phase noise in coherent systems is governed by laser linewidth. Hence, it is very important to investigate the impact of laser linewidth in CO-OFDM systems. This paper investigates the tolerable laser linewidths for different QAM formats in a 40 Gbps COOFDM system.

Share and Cite:

Dhawan, D. and Gupta, N. (2017) Investigation of Tolerable Laser Linewidth for Different Modulation Formats in CO-OFDM Systems. Optics and Photonics Journal, 7, 92-100. doi: 10.4236/opj.2017.75009.

Cited by

[1] Laser frequency noise characterization using high-finesse plano–concave optical microresonators
Sanchez, EZ Zhang, J Paterson… - Optics Letters, 2024
[2] Nonlinear polarization crosstalk canceled wavelength conversion for Pol-Mux OFDM signal with polarization-diversity FWM
Optics Express, 2023
[3] Estimation of channel distortion in orthogonal frequency division multiplexing system using pilot technique
Indonesian Journal of Electrical …, 2022
[4] Linewidth Compressor Based on Single-Frequency Brillouin Lasing Resonance for 64 Quadrature Amplitude Modulation Communications
2022 Asia …, 2022
[5] ANALYTICAL RESEARCH ON OPTICAL PHASE SHIFT MODULATION SCHEME WITH MAXIMUM MODULATION EFFICIENCY FOR ANALOG AND DIGITAL …
I-Manager's Journal on …, 2022
[6] Photonically integrated gain‐switched lasers for optical frequency comb generation
2021
[7] Characterization and direct modulation of a multi-section PIC suited for short reach optical communication systems
2020
[8] Cost-efficient, polarization-insensitive and widely-tunable AOWC of OFDM signal based on FWM in SOA
2019
[9] Phase Noise Characterization of a Mode-Locked Quantum-Dot Coherent Optical Frequency Comb Source Laser
2018

Copyright © 2025 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.