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We investigate the impact on system reach in FMF transmission due to MDL from FM-EDFAs. While mode-scrambling can reduce the growth rate of MDL with distance, there may be stringent MDL requirements for the mode-scramblers.
Using a transmission fiber with a zero differential modal dispersion wavelength and a gain-equalized few-mode EDFA, we demonstrate mode-multiplexed transmission over a fiber recirculating loop with all few-mode components.
We report graded index few mode fiber designs for mode-division multiplexing and demonstrate a 100-km few-mode fiber span with effective areas larger than 160 μm2 and differential mode group delay of less than 6 ps/km.
We demonstrate transmission of 8×80-Gb/s PDM-OFDM-16QAM signals at a channel spacing of 12.5GHz over 4,242km with EDFA only amplification. It achieves the longest transmission distance at the SE >5 b/s/Hz to date.
We demonstrate mode-division multiplexed transmission using the LP01 and LP11 modes over three heterogeneous spans of few-mode fiber and investigate the impact of fusion splicing and free-space coupling on mode mixing.
Crosstalk caused by random mode coupling can make mode-multiplexing infeasible. However, transmission of single mode over few-mode fibers is relatively insensitive to mode mixing and therefore they can be used as large-effective area fibers.
A two-mode erbium-doped fiber amplifier is experimentally characterized. Mode dependent gain is measured for different pump modes, and the results are compared with theory. We verified that higher-order pumping can help reduce mode-dependent gain.
We propose a method for controlling mode-dependent gain in a multimode Erbium-doped fiber amplifier by tuning the mode content of a multimode pump. The resulting device is suitable for mode-division multiplexed transmission.
We report the successful transmission of 64 Tb/s capacity (640 ×107 Gb/s with 12.5 GHz channel spacing) over 320 km reach utilizing 8-THz of spectrum in the C+L -bands at a net spectral efficiency of 8 bit/s/Hz. Such a result is accomplished by the use of raised-cosine pulse-shaped PDM-36QAM modulation, intradyne detection, both pre- and post-transmission digital equalization, and ultra-large-area...
We propose a hybrid C+L band fiber amplifier loop-back scheme which is composed of a C-band erbium-doped fiber amplifier (EDFA) and an L-band Raman fiber amplifier (RFA) using double-pass dispersion compensators in a loop-back scheme (also named as bridge scheme). Dispersion slope mismatch are precisely compensated for all 14 C+L band channels by writing fiber Bragg gratings (FBGs) at appropriate...
Employing PDM-RZ-8QAM modulation, digital coherent detection and EDFA-only amplification, we demonstrated 25GHz-spaced, 320×114Gb/s DWDM transmission through seven spans of ultra-low-loss fiber with a record capacity of 32Tb/s.
This paper reviews the key requirements for the high-capacity optical transmission that supports the exponential growth of global IP traffic. The requirements include total data rate, transmission distance, flexibility, reliability, and cost.
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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