Increasing dispersion tolerance of 10Gbit/s directly modulated lasers using optical filtering

<p>A novel technique of multiplexing called Tributary Mapping Multiplexing (TMM) is<br />applied to a single channel wavelength division multiplexing system and performance is monitored on the basis of simulation results. To elaborate the performance of TMM in this paper, a 4-User TMM system over single wavelength channel is demonstrated. TMM showed significant tolerance against narrow optical filtering as compared to that of conventional TDM at the rate of 40 Gbit/s. The above calculations are made by optical filter bandwidth and dispersion tolerance that was allowed at minimum. The spectral efficiency achieved by this TMM was 1 b/s/Hz and it was executed by using transmitters and receivers of 10 Gbit/s without polarized multiplexing. The high spectral efficiency, high dispersion tolerance and tolerance against strong optical filtering makes TMM an efficient technique for High<br />Speed Fiber Optic Communication.</p>

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Directly modulated lasers in negative dispersion fiber links

Opto-Electronics Review ◽

10.2478/s11772-007-0002-z ◽

2007 ◽

Vol 15 (2) ◽

Cited By ~ 9

Author(s):

P. Krehlik

Keyword(s):

High Speed ◽

Negative Dispersion ◽

High Speed Data ◽

Directly Modulated Lasers ◽

Signal Distortions ◽

Induced Signal ◽

Optimal Driving ◽

The Impact ◽

Dispersion Tolerance ◽

Laser Chirp

AbstractIn the paper the impact of frequency chirp of directly modulated lasers is considered in context of high-speed data transmission over negative dispersion fiber. Chirp/dispersion induced signal distortions are described, and detailed investigations of their influence on 10 Gb/s transmission system performance are presented. The desired laser chirp characteristics and optimal driving conditions are determined. It is also demonstrated that directly modulated laser with low chirp offers similar or even better dispersion tolerance than unchirped (externally modulated) source. Experimental verification of described investigations is presented at the end.

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Coplanar electrode directly modulated lasers with different cavity length

Microwave and Optical Technology Letters ◽

10.1002/mop.32780 ◽

2021 ◽

Author(s):

Borui Xu ◽

Jiazheng Sun ◽

Shijun Xia ◽

Sha Zhu ◽

Yu Liu ◽

...

Keyword(s):

Cavity Length ◽

Directly Modulated Lasers

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Novel Manchester-Based Multilevel Signaling for High-Speed Optical Communication Systems

Journal of Optical Communications ◽

10.1515/joc-2018-0139 ◽

2019 ◽

Vol 0 (0) ◽

Cited By ~ 1

Author(s):

Festus Idowu Oluwajobi ◽

Nguyen Dong-Nhat ◽

Amin Malekmohammadi

Keyword(s):

Communication Systems ◽

High Speed ◽

Chromatic Dispersion ◽

Optical Fiber Communication ◽

Pulse Amplitude ◽

Calculation Model ◽

Fiber Communication ◽

Receiver Sensitivity ◽

Communication Links ◽

Dispersion Tolerance

AbstractIn this paper, the performance of a novel multilevel signaling based on Manchester code namely four-level Manchester Coding (4-MC) technique is investigated for next generation high-speed optical fiber communication links. The performance of 4-MC is studied and compared with conventional Manchester modulation and four-level pulse amplitude modulation (4-PAM) formats in terms of receiver sensitivity, spectral efficiency and dispersion tolerance at the bit rate of 40 Gb/s. The bit error rate (BER) calculation model for the proposed multilevel scheme has also been developed. The calculated receiver sensitivity and the chromatic dispersion tolerance at the BER of 10–9 of the proposed scheme are −22 dBm and 67.5 ps/nm, respectively. It is observed that, 4-MC scheme is superior in comparison to 4-PAM by 3.5 dB in terms of receiver sensitivity in back-to-back scenario. Therefore, the proposed scheme can be considered as an alternative to current 4-PAM system.

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