tailieunhanh - Optical Fiber Communications and Devicesan incorrectly Part 7

Tham khảo tài liệu 'optical fiber communications and devicesan incorrectly part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 Optical Fiber Communications and Devices CD ps nm Fig. 10. Combined CD and PMD tolerance of 112Gb sec DP-QPSK coherent detection metro transmission system Summary Sub-section presented a Coherent Metro MLSE-based solution for 112Gb sec transmission which can be used in new deployed systems green field . The considerations of choosing optimal modulation format were discussed. DP-QPSK modulation format is the most suitable for metro transmission in the proposed system. The DSP that is required in coherent systems briefly described above is significantly more complicated than as compared to a direct detection system. Major bottlenecks of a coherent system are requirements for tremendous ADC sampling rate operation speed of the aforementioned DSP and associated complexity and power dissipation. Significant relaxations of all above can be achieved by introducing AAF allowing efficient practical implementation whereas accompanying ISI can be compensated by the MLSE with only 2dB penalty as compared to b2b for 100ps DGD in 1200km link. Section summary and conclusions In this section ultra-high speed 112Gb sec systems for brown and green field applications were proposed. In the brown field 4-wavelength direct detection is suggested where reduced bandwidth already existing and mature 10G components are used for 28Gb sec transmission in each lane. Since most deployed 10G systems use simplest modules at both Tx and Rx sides new RBW-OOK and RBW-DB modulation formats which can be transmitted and received in such a network were proposed and examined. Four MLSE engines are used to compensate for ISI introduced by the reduced bandwidth components and for performance improvement. MLSE reception of the proposed 141 Advanced Modulation Formats and MLSE Based Digital Signal Processing for 100Gbit sec Communication Through Optical Fibers modulation formats extends the link tolerance to residual CD and first order PMD as compared to conventional HD receiver. In many .

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