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<p>A scheme comprising only four optimized linearly chirped fiber Bragg gratings (LCFBGs) is proposed for compensating the dispersion effects in 48 × 20 Gbps DWDM system. Each grating is designed to reflect twelve channels. The effect of both positive gradient and negative gradient of temperature over the designed LCFBGs is analyzed. The proposed scheme is unique in two important aspects. First, only four numbers of CFBGs are required to simultaneously compensate the dispersion of 48 channels, each operating at 20 Gbps data rate and transmitted over 100&#xa0;km of single mode fiber, thus overcoming the limitations of multinarrowband gratings approach. The second unique aspect of this work is that the proposed four CFBGs are designed in such a way that by applying suitable temperature gradient, the same proposed CFBGs can be used to compensate the dispersion of any fiber lengths ranging from 80&#xa0;km to 135&#xa0;km in 48 × 20 Gbps DWDM system without altering the grating or system parameters. This approach ultimately reduces the cost and complexity of the system. The proposed scheme attains an average Q factor of 14.643, 17.39 and 14.13 after transmission of 48 channels each operating at 20 Gbps data rate over 80&#xa0;km, 100&#xa0;km and 135&#xa0;km fiber lengths respectively. The LCFBGs profile is designed in such a way that all the 12 channels remain within the respective LCFBG band even when temperatures are applied. In this work, it is ensured that the Q factor of all the channels maintains a uniform value for effective compensation. An effective optical compensation method with less complexity is presented in this work to compensate dispersion effects in high data rate DWDM systems. The proposed scheme is simple and has potential to play a significant role in high bit rate DWDM system, where the tolerable value of the dispersion is very small.</p>

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Design and evaluation of cascaded chirped fiber Bragg gratings in high bit rate DWDM system

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Chiranjit Ghosh

摘要

A scheme comprising only four optimized linearly chirped fiber Bragg gratings (LCFBGs) is proposed for compensating the dispersion effects in 48 × 20 Gbps DWDM system. Each grating is designed to reflect twelve channels. The effect of both positive gradient and negative gradient of temperature over the designed LCFBGs is analyzed. The proposed scheme is unique in two important aspects. First, only four numbers of CFBGs are required to simultaneously compensate the dispersion of 48 channels, each operating at 20 Gbps data rate and transmitted over 100 km of single mode fiber, thus overcoming the limitations of multinarrowband gratings approach. The second unique aspect of this work is that the proposed four CFBGs are designed in such a way that by applying suitable temperature gradient, the same proposed CFBGs can be used to compensate the dispersion of any fiber lengths ranging from 80 km to 135 km in 48 × 20 Gbps DWDM system without altering the grating or system parameters. This approach ultimately reduces the cost and complexity of the system. The proposed scheme attains an average Q factor of 14.643, 17.39 and 14.13 after transmission of 48 channels each operating at 20 Gbps data rate over 80 km, 100 km and 135 km fiber lengths respectively. The LCFBGs profile is designed in such a way that all the 12 channels remain within the respective LCFBG band even when temperatures are applied. In this work, it is ensured that the Q factor of all the channels maintains a uniform value for effective compensation. An effective optical compensation method with less complexity is presented in this work to compensate dispersion effects in high data rate DWDM systems. The proposed scheme is simple and has potential to play a significant role in high bit rate DWDM system, where the tolerable value of the dispersion is very small.