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.

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.

Suitability of FBG for Gain Flatness of 64 × 10 Gbps DWDM System Using Hybrid (EDFA+YDFA) Optical Amplifier in C + L Band up to 50 GHz (0.4 nm) Channel Spacing

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Harjit Singh ◽  
Anu Sheetal
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Fiber Amplifier ◽  
Optical Signal ◽  
Smart Devices ◽  
High Definition ◽  
Channel Spacing ◽  
Gain Flattening ◽  
L Band ◽  
Dwdm System

AbstractGain flatness of erbium-doped fiber amplifier (EDFA) is an important aspect to support high speed multimedia applications for smart devices, cloud computing, big data analysis and high definition television (HDTV) as it achieves equal power for all dense wavelength division multiplexing (DWDM) channels. In this paper, we compare 32 and 64 channels 10 Gbps DWDM system using hybrid EDFA+ Ytterbium-doped silica fiber amplifier (YDFA) in C + L band for 0.4, 0.8 and 1.6 nm wavelength spacing along with FBG for gain flattening. The system performance has been analyzed in terms of optical signal to noise ratio and spectral gain fluctuation observed from the optical power spectrums. It is observed that YDFA although extends the amplification window of EDFA from 1530 to 1610 nm (C to L band), but gain fluctuates over the operating wavelength range. Gain flatness is enormously improved (5–10 dB) by adding FBG as a gain flattening filter to the hybrid (EDFA+YDFA) amplifier. It is found that as the channel spacing decreases (from 1.6 to 0.4 nm) and the number of channels increases (from 32 to 64), the gain reduces due to inter-channel crosstalk and four wave-mixing effect.

scholarly journals Noise Gain Features of Fiber Raman Amplifier

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Georgii S. Felinskyi ◽  
Mykhailo Y. Dyriv
Keyword(s):  
Pump Power ◽  
Noise Figure ◽  
Single Mode ◽  
Gain Coefficient ◽  
Single Mode Fiber ◽  
Optical Noise ◽  
Raman Amplifier ◽  
Fiber Raman Amplifier ◽  
Gain Profile ◽  
Wide Wavelength Range

The formation dynamics of the optical noise in a silica single mode fiber (SMF) as function of the pump power variation in the counter pumped fiber Raman amplifier (FRA) is experimentally studied. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data in the pump powers range of 100–300 mW within the full band of Stokes frequencies, including FRA working wavelengths over the C + L transparency windows. It is found out the maximum of Raman gain coefficient for optical noise does not exceed ~60% of corresponding peak at the gain profile maximum of coherent signal. It is shown that the real FRA noise figure may be considerably less than 3 dB over a wide wavelength range (100 nm) at a pump power of several hundreds of mW.

Gain Enhancement in L–Band EDFA by Splitting EDF into Two Stages

2012 ◽  
Author(s):  
Sulaiman Wadi Harun ◽  
Harith Ahmad
Keyword(s):  
Pump Power ◽  
Noise Figure ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Erbium Doped Fiber Amplifier ◽  
Gain Enhancement ◽  
Erbium Doped ◽  
Dual Stage ◽  
L Band ◽  
Two Stages

Sebuah esperimen bagi menambah daya pembesaran untuk jalur gelombang panjang (jalur–L) pembesar terdop erbium (PTE) telah didemonstrasi menggunakan reka bentuk yang berbadan dua. Jika dibandingkan dengan pembesar yang berbadan satu, pembesar ini dapat menambah pembesaran untuk isyarat 1580 nm sebanyak 5.5 dB dengan sedikit sahaja penambahan nilai bisingan. Nilai bisingan bertambah sebanyak 0.3 dB kerana kemasukan isolator dalam reka bentuk. Kadar kuasa pam pertama mestilah 33% daripada jumlah keseluruhan kuasa pam untuk nilai optima. Pembesaran maksimum sebanyak 8.3 dB telah diperolehi oleh isyarat 1568 nm semasa kuasa isyarat dan kuasa pam, masing–masing ditetapkan pada 30 dBm dan 92 mW. Keputusan esperimen menunjukkan penggunaan pembesar berbadan dua dapat menjimatkan kos kerana ia menggunakan kuasa pam yang lebih rendah. Kata kunci: Gentian terdop erbium, pembesar optik, pembesar terdop erbium, jalus LPTE An experiment on gain enhancement in the long–wavelength band erbium–doped fiber amplifier (L–band EDFA) is demonstrated using a dual stage configuration. Compared to a conventional single–stage amplifier, the small signal gain for a 1580 nm signal can be improved by 5.5 dB without paying much noise figure penalty. The corresponding noise figure penalty was 0.3 dB due to the insertion loss of the optical isolator. The optimum pump power ratio for the first pump was experimentally determined to be 33%. The maximum gain improvement of 8.3 dB was obtained at a signal wavelength of 1568 nm while signal and total pump powers were fixed at –30 dBm and 92 mW, respectively. These results show that the employment of the dual–stage amplifier system will play an important role in the development of a practical L–band EDFA from the perspective of economical usage of pump power. Key words: Erbium doped fiber, optical amplifier, L-band EDFA, dual-stage EDFA, amlified spontaneous emission

Gain, Noise Figure and Efficiency Characteristics of an L-Band Erbium Doped Fiber Amplifier

2012 ◽  
Vol 2 (4) ◽  
pp. 1-11 ◽  
Author(s):  
Sami D. Alaruri
Keyword(s):  
Pump Power ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Noise Figure ◽  
Power Conversion ◽  
Fiber Amplifier ◽  
Erbium Doped Fiber Amplifier ◽  
Erbium Doped ◽  
Fiber Coil ◽  
L Band

In this work, the construction of a single stage L-band erbium-doped fiber amplifier which incorporates a short 5.1 m erbium doped fiber coil is described. Gain and noise figure measurements as a function of forward, backward and counter-propagating CW 1480 nm pumping schemes at different pump power levels are presented. Further, the Erbium Doped Fiber Amplifier (EDFA) power conversion efficiency (PCE) calculations as a function of pump power are provided.

scholarly journals Novel Raman Parametric Hybrid L-Band Amplifier with Four-Wave Mixing Suppressed Pump for Terabits Dense Wavelength Division Multiplexed Systems

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Gaganpreet Kaur ◽  
Sanjay Sharma ◽  
Gurmeet Kaur
Keyword(s):  
Four Wave Mixing ◽  
Parametric Amplifier ◽  
Wave Mixing ◽  
Channel Spacing ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Gain Flattening ◽  
L Band ◽  
Improved Performance ◽  
Dwdm System

We demonstrate improved performance of parametric amplifier cascaded with Raman amplifier for gain of 54.79 dB. We report amplification of L-band using 100 × 10 Gbps Dense Wavelength Division Multiplexed (DWDM) system with 25 GHz channel spacing. The gain achieved is the highest reported so far with gain flatness of 3.38 dB without using any gain flattening technique. Hybrid modulated parametric pump is used for suppressing four-wave mixing (FWM) around pump region, resulting in improvement of gain flatness by 2.42 dB. The peak to peak variation of gain is achieved less than 1.6 dB. DWDM system with 16-channel, 25 GHz spaced system has been analyzed thoroughly with hybrid modulated parametric pump amplified Raman-FOPA amplifier for gain flatness and improved performance in terms of BER and Q-factor.

A WIDEBAND AND FLAT-GAIN OF AN AMPLIFIER BY USING ZIRCONIA-BASED ERBIUM-DOPED FIBER (ZR-EDF) FOR SINGLE PASS PPERATION

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Arni Munira Markom ◽  
Harith Ahmad ◽  
Sulaiman Wadi Harun
Keyword(s):  
Pump Power ◽  
Input Signal ◽  
Noise Figure ◽  
Small Variation ◽  
High Gain ◽  
Optimum Length ◽  
Single Pass ◽  
Input Signals ◽  
Erbium Doped ◽  
Flat Gain

An amplification for single pass operation was demonstrated by using Zirconia-based erbium-doped fiber (Zr-EDF). 1 m is the optimum length due to overall high gain and minimal noise figure from 1520 nm to 1620 nm. The highest gain is 28.62 dB at 1555 nm with the input signal and pump power are fixed at -30 dBm and 130 mW, respectively. At input signal -10 dBm, a wide and flat-gain of 19.36 dB is obtained with very small variation gain of 0.27 dB from 1530 nm to 1570 nm. Meanwhile, the noise figure for both input signals were maintained below than 12 dBm for the specific regions.

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