Serial topology of wide-band erbium-doped fiber amplifier for WDM applications (original) (raw)
Related papers
IEEE Journal of Quantum Electronics, 2003
A long-wavelength-band erbium-doped fiber amplifier (L-band EDFA) using a pump wavelength source of 1540-nm band has been extensively investigated from a small single channel input signal to high-power wavelength division multiplexing (WDM) signals. The small-signal gain coefficient of 1545-nm pumping among the 1540-nm band is 2.25 times higher compared to the conventional 1480-nm pumping. This improvement in gain coefficient is not limited by the pumping direction. The cause for this high coefficient is explained by analyzing forward-and backward-amplified spontaneous emission spectra. The gain spectra as a function of a pump wavelength suggest that a broadband pump source as well as a single wavelength pump can be used as a 1540-nm-band pump. In the experiment for high-power WDM signals, the power conversion efficiency for 256 WDM channel input is 48.5% with 1545-nm pumping. This result shows more than 20% improvement compared with the previous highest value for the L-band EDFA. Finally, the 1545-nm bidirectionally pumped EDFA is applied as a second stage amplifier in an in-line amplifier of an optical communication link with a 1480-nm pumped first stage EDFA, in which the input power of the second-stage EDFA is +2.2 dBm. The power conversion efficiency yields a 38% improvement without noise figure degradation compared with the case of 1480-nm pumping.
This research is an attempt to reduce the gain variation, noise figure and to improve the gain broadness of EDFA by modified mathematical modeling of EDFA for 96 DWDM systems. An improved simulated model of EDFA is specially designed after all the major impairments are taken into account like noise, ASE fiber length, input pump and signal power. The mathematical model of EDFA has been proposed by improving the rate equations of EDFA. Variation of gain versus wavelength has been analyzed with and without ASE. This research claims to support 96 DWDM channels at a channel spacing of 0.8 nm, with a gain of 23.8 dB, ASE of 0.9 dBm for 6 m EDF length for 1479 nm-1555 nm EDFA.
Performance of erbium-doped fiber amplifier cascades in WDM multiple access lightwave networks
IEEE Photonics Technology Letters, 2000
A simple method to optimize individual EDFA performance parameters for multiwavelenght operation in an amplifier cascade is presented. The pump power, pump wavelenght, Erbium-doped fiber lenght, and input signal levels and their spectral range are each optimized. We find that 980-nm pumping, together with an optimum amplifier lenght of 9 m, provides adequate performance for six 10 Gb/s WDM channels to be transmitted through a cascade of 27 amplifiers, allowing atotal system gain of more than 350 dB without requiring gain equalization methods.
IJERT-Optimization Of Gain And Bit Error Rate Of An Erbium Doped Fiber Amplifier For Wdm System
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/optimization-of-gain-and-bit-error-rate-of-an-erbium-doped-fiber-amplifier-for-wdm-system https://www.ijert.org/optimization-of-gain-and-bit-error-rate-of-an-erbium-doped-fiber-amplifier-for-wdm-system The Gain flattened EDFA plays a major role for modern WDM optical application. Use of a Low Pass Cosine Roll Off Filter and tuning numerical aperture and fiber length for a specific pump power optimizes the gain flattening. The design is simulated using OPTISYSTEM software. The gains are flattened within 29.61dB-30.401dB from 1546nm-1558nm band of wavelength with noise figure (NF) < 5.5dB and bit error rate (BER) <10-36 for 16 channel simultaneous amplification in a single stage EDFA.
Fundamental design of a distributed erbium-doped fiber amplifier for long-distance transmission
IEEE/OSA Journal of Lightwave Technology, 1992
Abstruct-Comprehensive theoretical analysis on the design of a distributed erbium doped fiber amplifier for long-distance transmission has been carried out, using a highly accurate model. The dispersion of the optical fiber as a function of the numerical aperture and the cutoff wavelength is included. Designs based on a bidirectional pumping scheme are evaluated, taking nonlinearities into account. The optimum value of the numerical aperture will be evaluated for cutoff wavelengths where the propagating pumppower is single moded. For distances between each pumping station in the region between 10 and 100 km, the optimum ratio of CO-and counterpropagating pump power will also be evaluated.
Gain And Noise Figure Performance Of Erbium Doped Fiber Amplifiers (EDFA)
Matlab to characterize Gain, Noise Figure and ASE power variations of a forward pumped EDFA operating in C band (1525-1565 nm) as functions of Er 3+ fiber length, injected pump power, signal input power and Er 3+ doping density. The program solves the rate and propagation equations numerically and shows the results graphically. Thus, Gain and Noise Figure performance of an EDFA given with its physical parameters can be graphically obtained or the required physical parameters of an EDFA with desired operating performance can easily be optimised.
High-gain coefficient long-wavelength-band erbium-doped fiber amplifier using 1530-nm band pump
IEEE Photonics Technology Letters, 2000
A 1530-nm band has been studied as pump wavelength for long-wavelength-band erbium-doped fiber amplifier (L-band EDFA). The pump source is built using a tunable light source and cascaded conventional-band (C-band) EDFA. The L-band EDFA uses a forward pumping scheme. Within the 1530-nm band, 1545-nm pump demonstrates 0.45-dB/mW gain coefficient, which is twice better than that of conventional 1480-nm pumped EDFA. The noise figure of 1530-nm pump is at worst 6.36 dB, which is 0.75 dB higher than that of 1480-nm pumped EDFA. Such high-gain coefficient indicates that the L-band EDFA consumes low power.
Realization of a Long-haul Optical Link with Erbium Doped Fiber Amplifier
Carpathian Journal of Electronic and Computer Engineering
The need for high capacity and bandwidth in broadband communication systems increased rapidly in a few past years. Optical fiber is now the major transmission medium for fast and reliable communication replacing the old copper-based connections. However, with the deployment of optical networks, number of problems arise. The main problem of optical networks is the amplification in the long-distance transmission. Erbium doped fiber amplifier (EDFA) is the leading technology in the field of optical amplifiers. It uses erbium doped fiber to amplify optical signal. The importance of amplification in optical domain is relevant in long-haul and high-speed transmission systems. In this paper the study of the EDFA is presented. Based on an analytical study, the simulation model of the EDFA is created. The main aim is to determine the optimal parameters of the EDFA for a long-haul 16-channel DWDM (Dense Wavelength Division Multiplexing) system. The performance of the proposed DWDM system is m...
Performances of Erbium-Doped Fiber Amplifier at 980-nm Pump Power in Various Parameter Combinations
Applied Physics Research, 2015
Optical fiber amplifiers are dominating the loss compensation in fiber optic communications systems, especially the Erbium doped types for communication spectrum based on silica fibers. The gain of the EDFA can be maximized by using appropriate design parameters and appropriate value of the material properties. This paper describes the derivation of the equations that govern the pump power, input signal propagation, gain and optimum fiber length of the amplifier. By using these deduced expressions, new tools have been developed using C programming and MATLAB and then the performances of EDFA pumped with 980-nm signal have been analyzed. The analysis results that the gain of the amplifier increases with the length of the amplifier, and also with the pump signal power. At higher values of signal power the gain becomes saturated. The gain has a nonlinear relation with the amplifier length for a particular pump power. From the experiments, it has been found that for a particular length the saturation gain increases with the carrier density of the amplifier, but at longer length the gain is almost independent of the carrier density. It has also been found that the pump threshold power increases linearly with the length and carrier density of the amplifier. The tools developed in the analysis process could be used by researchers in future for further investigation of the performance of EDFA in various parameter sets or, for finding a parameter set for specific target performance of the EDFA.