Bandwidth of a single-mode optical fiber in PSK coherent optical transmission systems

1988 ◽  
Vol 6 (2) ◽  
pp. 322-328 ◽  
Author(s):  
K. Tajima
Keyword(s):  
Optical Fiber ◽  
Optical Transmission ◽  
Single Mode ◽  
Transmission Systems ◽  
Single Mode Optical Fiber ◽  
Optical Transmission Systems

scholarly journals Possibilities for Advanced Encoding Techniques at Signal Transmission in the Optical Transmission Medium

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Filip Čertík ◽  
Rastislav Róka
Keyword(s):  
Optical Fiber ◽  
Simulation Model ◽  
Optical Transmission ◽  
Signal Transmission ◽  
Optical Signal ◽  
Negative Effects ◽  
Transmission Systems ◽  
High Data ◽  
Modulation Techniques ◽  
Optical Transmission Systems

This paper presents a possible simulation of negative effects in the optical transmission medium and an analysis for the utilization of different signal processing techniques at the optical signal transmission. An attention is focused on the high data rate signal transmission in the optical fiber influenced by linear and nonlinear environmental effects presented by the prepared simulation model. The analysis includes possible utilization of OOK, BPSK, DBPSK, BFSK, QPSK, DQPSK, 8PSK, and 16QAM modulation techniques together with RS, BCH, and LDPC encoding techniques for the signal transmission in the optical fiber. Moreover, the prepared simulation model is compared with real optical transmission systems. In the final part, a comparison of the selected modulation techniques with different encoding techniques and their implementation in real transmission systems is shown.

Multicore fibers for large capacity transmission

Nanophotonics ◽  
2013 ◽  
Vol 2 (5-6) ◽  
pp. 441-454 ◽  
Author(s):  
Kunimasa Saitoh ◽  
Shoichiro Matsuo
Keyword(s):  
Optical Transmission ◽  
State Of The Art ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Long Distance ◽  
Transmission Systems ◽  
Large Capacity ◽  
Spatial Efficiency ◽  
Optical Transmission Systems ◽  
Current Maximum

AbstractWe experience Internet traffic growth of 100 times every 10 years. However, the capacity of existing standard single-mode fiber is approaching its fundamental limit regardless of significant realization of transmission technologies which allow for high spectral efficiencies. Space division multiplexing (SDM) based on multicore fibers (MCFs) has emerged as a solution to the problem of saturation of the capacity of optical transmission systems. This article presents the recent progress on the MCFs for future large capacity long-distance transmission systems. In MCFs, there is a tradeoff relationship between low crosstalk and high multiplicity, therefore the maximum number of cores and the core arrangement have to be carefully determined based on the required crosstalk level and core size. The state-of-the-art of fabricated MCFs and the transmission experiments using MCFs are reviewed. The current maximum capacity-distance product in MCF transmission is 368.2 (184.1+184.1) Pb/s/fiber km with the relative spatial efficiency of 4.7 compared with a standard single-mode fiber. In order to increase the spatial efficiency as well as the capacity-distance product further in MCFs, the possibility of heterogeneous MCFs and few-mode MCFs is also presented.

scholarly journals Advanced DSP for Coherent Optical Fiber Communication

2019 ◽  
Vol 9 (19) ◽  
pp. 4192 ◽  
Author(s):  
Jian Zhao ◽  
Yaping Liu ◽  
Tianhua Xu
Keyword(s):  
Optical Fiber ◽  
Optical Transmission ◽  
High Capacity ◽  
Single Mode ◽  
Optical Fiber Communication ◽  
Coherent Detection ◽  
System Capacity ◽  
Limiting Factors ◽  
Transmission Systems ◽  
Fiber Communication

In this paper, we provide an overview of recent progress on advanced digital signal processing (DSP) techniques for high-capacity long-haul coherent optical fiber transmission systems. Not only the linear impairments existing in optical transmission links need to be compensated, but also, the nonlinear impairments require proper algorithms for mitigation because they become major limiting factors for long-haul large-capacity optical transmission systems. Besides the time domain equalization (TDE), the frequency domain equalization (FDE) DSP also provides a similar performance, with a much-reduced computational complexity. Advanced DSP also plays an important role for the realization of space division multiplexing (SDM). SDM techniques have been developed recently to enhance the system capacity by at least one order of magnitude. Some impressive results have been reported and have outperformed the nonlinear Shannon limit of the single-mode fiber (SMF). SDM introduces the space dimension to the optical fiber communication. The few-mode fiber (FMF) and multi-core fiber (MCF) have been manufactured for novel multiplexing techniques such as mode-division multiplexing (MDM) and multi-core multiplexing (MCM). Each mode or core can be considered as an independent degree of freedom, but unfortunately, signals will suffer serious coupling during the propagation. Multi-input–multi-output (MIMO) DSP can equalize the signal coupling and makes SDM transmission feasible. The machine learning (ML) technique has attracted worldwide attention and has been explored for advanced DSP. In this paper, we firstly introduce the principle and scheme of coherent detection to explain why the DSP techniques can compensate for transmission impairments. Then corresponding technologies related to the DSP, such as nonlinearity compensation, FDE, SDM and ML will be discussed. Relevant techniques will be analyzed, and representational results and experimental verifications will be demonstrated. In the end, a brief conclusion and perspective will be provided.

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