Performance Enhancement of WDM Optical System with Coherent Detection (Record no. 116704)
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| 000 -LEADER | |
|---|---|
| fixed length control field | ngm a22 7a 4500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 190502b ||||| |||| 00| 0 eng d |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | TT000065 |
| Item number | PAT |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Patel, Rohit Bhimjibhai |
| 245 ## - TITLE STATEMENT | |
| Title | Performance Enhancement of WDM Optical System with Coherent Detection |
| Statement of responsibility, etc | by Rohit Bhimjibhai Patel |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Ahmedabad |
| Name of publisher, distributor, etc | Nirma Institute of Technology |
| Date of publication, distribution, etc | 2018 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 126p Ph. D. Thesis with Synopsis and CD |
| 500 ## - GENERAL NOTE | |
| General note | Guided by: Dr. D. K. Kothari With Synopsis and CD 11EXTPHDE61<br/><br/>ABSTRACT:<br/>Wavelength division multiplexed (WDM) optical communication is rapidly growing<br/>with deployment of multilevel modulation formats. Efficient utilization of optical fiber<br/>bandwidth with high spectral efficiency is the key advantage of this technology for long<br/>transmission reach. However, fiber linear and nonlinear impairments are still the<br/>challenges which prevent the growth of WDM optical communication at high data rates.<br/>Coherent detection technique with digital signal processing (DSP) at the receiver end<br/>has shown the capability to overcome these challenges. Further, multi-carrier<br/>generation at transmitter and the use of polarization division multiplexed (PDM) multilevel<br/>modulation format are the solutions to enhance the spectral efficiency of the<br/>system with narrow spacing between channels.<br/>In this thesis, multi-carrier generation concept is applied at transmitter side employing<br/>coherent detection technique with DSP at receiver end to enhance the performance of<br/>WDM optical system. Polarization division multiplexed quadrature phase shift keying<br/>(PDM QPSK) and polarization division multiplexed 16- quadrature amplitude<br/>modulation (PDM 16-QAM) are used to realize the WDM optical system for long reach<br/>at high transmission rates. Hybrid transmission approach has also been considered in<br/>designing the system to represent the system performance in the dual modulation<br/>environment. Q-factor, Log of Estimated symbol error (Log (ESE)) and error vector<br/>magnitude (EVM) are considered as a performance metrics. Simulation results are<br/>obtained using optisystem software.<br/>The performance of 12 x 160 Gb/s (1.92 Tb/s) wavelength division multiplexed WDM<br/>optical system employing dual carrier and coherent detection with DSP is investigated<br/>for three different cases: gray coding, with differential coding and without any coding.<br/>Results are compared for 100 km transmission using polarization division multiplexed<br/>quadrature phase shift keying (PDM-QPSK) format. The results exhibit that system<br/>with differential coding performs better in comparison with gray coding and without<br/>any coding technique. Improvement of 2 to 5 dB in Q factor is found for system using<br/>differential coding. Moreover, performance evaluation for long transmission distance<br/>up to 8000 km is carried out for WDM optical system with differential coding technique<br/>with maintaining the Q factor beyond the FEC limit (BER value 3.8 x 10-3). An effort is made to investigate the performance of 4 x 200 Gbps (800 Gb/s) coherent<br/>WDM Optical systems employing dual carrier concept for polarization division<br/>multiplexed 16-quadrature amplitude modulation (PDM 16-QAM) modulation format.<br/>Results are compared for the system with nonlinearity compensation and without<br/>nonlinearity compensation at the receiver end. Improvement in Q factor is observed<br/>almost 2.43 dB to 1.95 dB for system with nonlinearity compensation than system<br/>without nonlinearity compensation at 6 dBm power per channel for 200 km to 1000 km<br/>transmission reach. Spectral efficiency of 4 b/s/Hz is achieved by keeping 50 GHz<br/>channel spacing between generated sub-carriers. Another approach is made to evaluate<br/>10 x 100 Gbps coherent WDM optical system using hybrid modulation. WDM system<br/>is designed using PDM QPSK and PDM 16-QAM modulation formats in combination<br/>with dual carrier concept. Results are reported with ULAF fiber and SSMF fiber for<br/>WDM optical system. System with ULAF fiber shows better results due to less<br/>influence of fiber nonlinearity at 2500 km transmission reach.<br/>A Comparative analysis is carried out of of 23 x 100 Gbps (2.3 Tb/s) WDM Optical<br/>systems employing multicarrier generation for three different fibers: ultra large area<br/>fiber (ULAF), standard single mode fiber (SSMF) and large effective area fiber<br/>(LEAF). Enhancement in Q-factor is observed almost 3.21 dB and 4.63 dB for system<br/>with ULAF fiber than system with SSMF and LEAF fibers respectively for 5000 km<br/>transmission reach. Performance comparison is also carried out using ultra large area<br/>fiber (ULAF) and large effective area fiber (LEAF) for 39 x 100 Gbps (3.9 Tb/s) hybrid<br/>transmission WDM optical system employing multicarrier generation. Among 39<br/>carriers, 20 sub-carriers utilize PDM-QPSK modulation format and 19 sub-carriers use<br/>PDM 16-QAM format. It is found that deployment of ULAF fiber outperforms than<br/>LEAF fiber in the system at long transmission reach. |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://repository.nirmauni.ac.in/jspui/handle/123456789/8352 |
| Public note | Institute Repository (Campus Access) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://shodhganga.inflibnet.ac.in/jspui/handle/10603/245986 |
| Public note | Shodhganga |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
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