Global Optimization of Fiber-Optic Communication Systems using Four-Dimensional Modulation Formats

2011 ◽  
Author(s):  
Leonardo D. Coelho ◽  
Norbert Hanik
Keyword(s):  
Global Optimization ◽  
Communication Systems ◽  
Fiber Optic ◽  
Modulation Formats ◽  
Fiber Optic Communication ◽  
Optic Communication

scholarly journals Time Domain Equalization and Digital Back-Propagation Method-Based Receiver for Fiber Optic Communication Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Fazal Muhammad ◽  
Farman Ali ◽  
Usman Habib ◽  
Muhammad Usman ◽  
Imran Khan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Spectral Efficiency ◽  
Communication Systems ◽  
High Speed ◽  
Fiber Optic ◽  
Detection System ◽  
Data Rate ◽  
Modulation Formats ◽  
Fiber Optic Communication ◽  
Optic Communication

Fiber optic communication systems (FOCSs) have attained a lot of attention by revolutionizing the telecommunication industry and offering new possibilities with the technical advancements in state-of-the-art high speed digital electronics. Advanced modulation formats make use of the phase, amplitude, and polarization of the optical signals at the same time to provide high spectral efficiency as compared with 1 bit/s/Hz for the intensity modulation direct detection system (IMDD), but are highly prone to transmission impairments. Thus, the effects that add up to the optical fiber impairments such as optical fiber chromatic dispersion (OFCD), polarization model dispersion (PMD), and phase offset and noise (POaN) need to be addressed at the receiver side. The development of components and algorithms to minimize these effects in next generation FOCSs with 100 Gbps data rate and beyond with long-haul transmission is still a challenging issue. In this paper, digital signal processing- (DSP-) assisted dispersion and nonlinear compensation techniques are presented to compensate for physical layer impairments including OFCD, PMD, and POaN. The simulations are performed considering Dual Polarization- (DP-) QPSK modulation format to achieve two-fold data rate to achieve spectral efficiency of 3.28 bits/s/Hz by making use of the polarization diversity and system performance is investigated in terms of bit error rate (BER), constellation diagrams, and quality factor (Q-factor) for different values of optical signal-to-noise ratio (OSNR), launch power (PL), and fiber length.

THE DESIGN AND FABRICATION OF HIGH-SPEED HBT CIRCUITS FOR FIBER-OPTIC COMMUNICATION SYSTEMS

1994 ◽  
Vol 05 (03) ◽  
pp. 253-274 ◽  
Author(s):  
MASAO OBARA ◽  
JUNKO AKAGI
Keyword(s):  
Measurement System ◽  
Communication Systems ◽  
High Speed ◽  
Fiber Optic ◽  
Heterojunction Bipolar Transistor ◽  
Fiber Amplifiers ◽  
Speed Measurement ◽  
Fiber Optic Communication ◽  
Optical Fiber Amplifiers ◽  
Optic Communication

AlGaAs/GaAs heterojunction bipolar transistor (HBT) high speed ICs have been paving the way for the most sophisticated fiber-optic communication systems since the late 1980s. Recently 20 Gbps HBT ICs have been developed to accommodate the emergence of optical fiber amplifiers. HBT technology is now proceeding towards the development of 40 Gbps systems where the lack of high speed measurement system remains an issue.

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