In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,...In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.展开更多
We present a novel configuration for carrier suppressed return-to-zero (CSRZ) signal generation, which only requires a single stage Mach-Zehnder (MZ) modulator in conjunction with an electrical mixer. Electrical band-...We present a novel configuration for carrier suppressed return-to-zero (CSRZ) signal generation, which only requires a single stage Mach-Zehnder (MZ) modulator in conjunction with an electrical mixer. Electrical band-limiting is also introduced to increase dispersion tolerance without causing additional penalty due to nonlinear effects in long haul dense wavelength division multiplexed (DWDM) CSRZ systems using conventional launch power levels.展开更多
We show that absorbed and stored electromagnetic energy are proportional to the reflection group delay in highly reflective dispersive dielectric mirrors over the high-reflectivity band.Our theoretical considerations ...We show that absorbed and stored electromagnetic energy are proportional to the reflection group delay in highly reflective dispersive dielectric mirrors over the high-reflectivity band.Our theoretical considerations are verified by numerical simulations performed on different dielectric mirror structures.The revealed proportionality between group delay and absorbed energy sets constraint on the application of ultrabroadband and/or dispersive dielectric mirrors in broadband or widely tunable,high-power laser systems.展开更多
We propose a spectral-mode-splitting scheme and how it can be applied to CSRZ and CSRZ-DPSK signal formats, and show that it provides both accurate chromatic dispersion detection in CSRZ application and robustness aga...We propose a spectral-mode-splitting scheme and how it can be applied to CSRZ and CSRZ-DPSK signal formats, and show that it provides both accurate chromatic dispersion detection in CSRZ application and robustness against linear cross talk and nonlinear impairment in CSRZ-DPSK applications.展开更多
An ultra long haul WDM (ULWDM) system in ZTE China is introduced in this report, whose transmission distance has been extended to 5490km, with 50GHz channel spacing in a bandwidth of 75nm in C and L bands. The structu...An ultra long haul WDM (ULWDM) system in ZTE China is introduced in this report, whose transmission distance has been extended to 5490km, with 50GHz channel spacing in a bandwidth of 75nm in C and L bands. The structure and techniques of the commercial equipment and experiment facilities are introduced. Some important techniques - RZ modulation, distributed amplification, and automatic control--in this system are introduced. Some test results are described as well.展开更多
文摘In 40 Gb/s systems with low polarization-mode dispersion(PMD) fibers,first-order PMD is the dominate factor with quite small value. An adaptive PMD compensator consisting of an electrical polarization controller(PC) ,a section of polariza-tion maintaining fiber(PMF) ,a degree of polarization(DOP) detector and a feedback control module is employed in 40 Gb/s NSFCNet. This compensator has a simple structure and high speed,which can compensate up to 20 ps first-order PMD adaptively and the average searching time is 2 ms.
文摘We present a novel configuration for carrier suppressed return-to-zero (CSRZ) signal generation, which only requires a single stage Mach-Zehnder (MZ) modulator in conjunction with an electrical mixer. Electrical band-limiting is also introduced to increase dispersion tolerance without causing additional penalty due to nonlinear effects in long haul dense wavelength division multiplexed (DWDM) CSRZ systems using conventional launch power levels.
基金supported in part by the National "973" Program of China (No. 2011CB301702)the National Natural Science Foundation of China (Nos. 61001121,61006041,60736036,and 60932004)the Fundamental Research Funds for the Central Universities
文摘We show that absorbed and stored electromagnetic energy are proportional to the reflection group delay in highly reflective dispersive dielectric mirrors over the high-reflectivity band.Our theoretical considerations are verified by numerical simulations performed on different dielectric mirror structures.The revealed proportionality between group delay and absorbed energy sets constraint on the application of ultrabroadband and/or dispersive dielectric mirrors in broadband or widely tunable,high-power laser systems.
文摘We propose a spectral-mode-splitting scheme and how it can be applied to CSRZ and CSRZ-DPSK signal formats, and show that it provides both accurate chromatic dispersion detection in CSRZ application and robustness against linear cross talk and nonlinear impairment in CSRZ-DPSK applications.
文摘An ultra long haul WDM (ULWDM) system in ZTE China is introduced in this report, whose transmission distance has been extended to 5490km, with 50GHz channel spacing in a bandwidth of 75nm in C and L bands. The structure and techniques of the commercial equipment and experiment facilities are introduced. Some important techniques - RZ modulation, distributed amplification, and automatic control--in this system are introduced. Some test results are described as well.
