scholarly journals Gain Flattening and Noise Figure Analysis of EDFA WDM Configuration for L-band Optical Communication using Wavelength Selective Attenuator

2013 ◽  
Vol 5 (3) ◽  
Author(s):  
Somnath Pain ◽  
Mousumi Biswas ◽  
Sambhunath Biswas
Keyword(s):  
Optical Communication ◽  
Noise Figure ◽  
Gain Flattening ◽  
L Band

scholarly journals Performance Analysis of Flat Gain Wideband Raman Amplifier for S+C and C+L Band DWDM System

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Dipika D. Pradhan ◽  
Abhilash Mandloi
Keyword(s):  
Pump Power ◽  
Noise Figure ◽  
Excited State Absorption ◽  
Telecommunication Networks ◽  
Raman Amplifier ◽  
Gain Flattening ◽  
L Band ◽  
Flat Gain ◽  
Amplifier Design ◽  
Dwdm System

Raman amplifier is an open area of research in telecommunication field. This paper discusses the performance of 64 channels of 10 Gbps WDM systems with backward multipump Raman amplifier. The main goal of this paper is the optimization of Raman amplifier to minimize its gain variation without using any gain flattening techniques. To increase the transmission capacity of DWDM system, Raman amplifier with backward multipump configuration is implemented. The optimized parameters such as pump power and frequencies are used to deliver both ground and excited state absorption for amplification in S+C and C+L band region. The pump power and frequencies are optimized through multitarget and multiparameter optimization tool available in OptiSystem software. Gain ripple was achieved <0.5 dB for this simulation setup. The maximum flat gain achieved is 8.6 dB and noise figure of <8 dB was achieved for this wide bandwidth without using gain flattening techniques. This amplifier design will be helpful for CATV applications and telecommunication networks.

scholarly journals Gain Flattening of L-band EDFA -Raman Hybrid Amplifier

2017 ◽  
Vol 174 (3) ◽  
pp. 29-31
Author(s):  
Avneet Kour ◽  
Neena Gupta
Keyword(s):  
Gain Flattening ◽  
L Band

Automatic Gain-Controlled HOA with Residual Pumping

2017 ◽  
Vol 0 (0) ◽  
Author(s):  
Navjot Singh ◽  
Mahendra Kumar ◽  
Ashu Verma
Keyword(s):  
Pump Power ◽  
Broad Spectrum ◽  
Communication Systems ◽  
Noise Figure ◽  
Optical Amplifiers ◽  
Optical Amplifier ◽  
Maximum Gain ◽  
L Band ◽  
Flat Gain

AbstractThe interminable need of number of channels in communication systems escorts more number of wavelengths to be used. This broad spectrum of wavelengths when expands in both C and L band, the need of hybrid optical amplifiers (HOA) comes into play. In this work, we proposed an automatic gain-controlled HOA using Residual pumping for C/L band. The desired gain is fixed at 27 dB at pump power swinging between 300 and 400 mW. The input powers are automatically adjusted so as to provide invariable and flat gain eliminating the wavelength dependency of optical amplifier to great extents. Analysis is carried out in a 32 channel WDM system and power transients are also measured in terms of powers of surviving channels and excursion amplitudes by adding and dropping up to 28 channels. The output is adjudicated in terms of maximum gain achieved, OSNR, BER, gain flatness, noise figure and power transient excursion amplitudes.

Design of a Front-End for Satellite Receiver

2016 ◽  
Vol 6 (5) ◽  
pp. 2282 ◽  
Author(s):  
Tran Van Hoi ◽  
Ngo Thi Lanh ◽  
Nguyen Xuan Truong ◽  
Nguyen Huu Duc ◽  
Bach Gia Duong
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
High Sensitivity ◽  
Wide Band ◽  
Local Oscillator ◽  
Low Noise ◽  
Voltage Controlled Oscillator ◽  
Front End ◽  
L Band ◽  
Satellite Receiver

<p>This paper focuses on the design and implementation of a front-end for a Vinasat satellite receiver with auto-searching mechanism and auto-tracking satellite. The front-end consists of a C-band low-noise block down-converter and a L-band receiver. The receiver is designed to meet the requirements about wide-band, high sensitivity, large dynamic range, low noise figure. To reduce noise figure and increase bandwidth, the C-band low-noise amplifier is designed using T-type of matching network with negative feedback and the L-band LNA is designed using cascoded techniques. The local oscillator uses a voltage controlled oscillator combine phase locked loop to reduce the phase noise and select channels. The front-end has successfully been designed and fabricated with parameters: Input frequency is C-band; sensitivity is greater than -130 dBm for C-band receiver and is greater than -110dBm for L-band receiver; output signals are AM/FM demodulation, I/Q demodulation, baseband signals.</p>

Flattened gain S + C + L Band RAMAN–Thulium-Doped Tellurite Fiber Amplifier Hybrid Optical Amplifier for Super Dense Wavelength Division Multiplexing System

2019 ◽  
Vol 40 (3) ◽  
pp. 167-170 ◽  
Author(s):  
Chakresh Kumar ◽  
Rakesh Goyal
Keyword(s):  
Wavelength Division Multiplexing ◽  
Noise Figure ◽  
Power Level ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Dense Wavelength Division Multiplexing ◽  
Wavelength Division ◽  
Proposed Model ◽  
L Band ◽  
Hybrid Optical Amplifier

Abstract In this paper we have examined the performances of 180×10 Gbps super dense wavelength division multiplexing (SD-WDM) system using the RAMAN–thulium-doped tellurite fiber amplifier (TDTFA) hybrid optical amplifier (HOA) with the channel spacing of 50 GHz in S+C+L band. Accepted rating flattened gain of 39.21 dB with the noise figure less than 5 dB is archived with the dual-pumping ( power level of 500 mW at 980 nm and at 1100 nm for RAMAN optical amplifier and similar, power level of TDTF amplifier is set to 500 mW and 350 mW at 1150 nm) technique. The effect of the proposed hybrid amplifier is evaluated in terms of gain and noise figure without using any coast effective technique. The outcome from the proposed model is also compared here with the existing optical amplifier.

L-BAND EDFA WITH INJECTION OF C-BAND ASE

2004 ◽  
Vol 13 (02) ◽  
pp. 315-319
Author(s):  
S. W. HARUN ◽  
H. AHMAD
Keyword(s):  
Noise Figure ◽  
Fiber Amplifier ◽  
Injection Technique ◽  
Small Signal Gain ◽  
Small Signal ◽  
Erbium Doped Fiber Amplifier ◽  
Gain Variation ◽  
Erbium Doped ◽  
Gain Clamping ◽  
L Band

The effect of injecting of C-band amplified spontaneous emission (ASE) from C-band erbium-doped fiber amplifier (EDFA) on the performance of L-band EDFA is demonstrated using a circulator and broadband fiber Bragg grating (FBG). Injecting a large amount of ASE (VOA=0 dB) clamps the gain at 15.2 dB from -40 to -10 dBm with a gain variation of less than 0.3 dB. Injecting a small amount of ASE (attenuation of 20 dB and above) improves the small signal gain with a negligible noise figure penalty compared to that of an amplifier without the ASE injection. A maximum gain improvement of 3.5 dB is obtained at an attenuation of 20 dB. These results show that the ASE injection technique can be used either for gain improvement or gain clamping in L-band EDFA.

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