TiO2-Doped Single-Mode Fiber as Active Material for Raman Lasers

2017 ◽  
Vol 753 ◽  
pp. 173-179 ◽  
Author(s):  
Georgii S. Felinskyi ◽  
Iryna V. Serdeha ◽  
Valeriy I. Grygoruk
Keyword(s):  
Spectroscopic Analysis ◽  
Active Material ◽  
Single Mode ◽  
Analytic Form ◽  
Single Mode Fiber ◽  
Fiber Types ◽  
Raman Gain ◽  
Raman Lasers ◽  
Gain Profile ◽  
Gain Threshold

The properties of TiO2-doped fiber are considered as optoelectronic material in our work. The advantages of such fiber have been studied with the aim of its application to active medium in Raman fiber lasers. The comparison of spontaneous Raman spectra and corresponding gain profiles in TiO2-doped and GeO2-doped fiber is presented. Raman gain profiles were obtained over a broad spectral range of Stokes shifted frequencies up to 1400 cm-1(42 THz). The spectral decomposition using multimode Gaussian components has been performed for both Raman gain profiles. High accuracy analytic form of Raman gain profile of TiO2-doped fiber is obtained using 12 components. The pump power of Raman gain threshold is introduced as the function of wavelength within the telecommunication windows for both fiber types. Our spectroscopic analysis allows presenting the numerical results on lasing bandwidth and Raman gain threshold inTiO2-doped single-mode fiber. It has been shown that the lasing bandwidth in TiO2-doped fiber may be almost twice wider than the lasing bandwidth in standard GeO2-doped fiber.

scholarly journals Spectroscopic Features of Raman Gain Profiles in Single-Mode Fibers Based on Silica Glass

2018 ◽  
Vol 63 (8) ◽  
pp. 683 ◽  
Author(s):  
I. V. Serdeha ◽  
V. I. Grygoruk ◽  
G. S. Felinskyi
Keyword(s):  
Silica Glass ◽  
Single Mode ◽  
Raman Gain ◽  
Oscillatory Dynamics ◽  
Experimental Profile ◽  
Raman Lasers ◽  
Gain Profile ◽  
Analytic Expressions ◽  
Amorphous Glass ◽  
Gaussian Decomposition

The spectroscopic analysis of the frequency distribution of the amplification of optical radiation due to the Raman effect (Raman gain profile) in single-mode fibers based on silica glass has been carried out in the region of Stokes frequency shifts from 0 to 1400 cm−1. The Raman gain profiles are determined from the experimental spectra of spontaneous scattering for widespread fibers, namely for pure SiO2, GeO2, P2O5, and TiO2 doped fibers. The analytic expressions of the Raman gain profiles are given. They are obtained, by using the Gaussian decomposition by means of 11–12 modes, and the experimental profile is approximated with an accuracy of not less than 0.3%. The decomposition results are analyzed in terms of the fundamental oscillatory dynamics of molecular nanocomplexes in amorphous glass, as well as in the application aspect of the modeling of photonics devices. Examples of the proposed method applications are presented for the analysis of noise parameters of the fiber Raman amplifiers and for the generation bandwidth in fiber Raman lasers.

NUMERICAL COMPARISON OF MULTI-PUMP RAMAN AMPLIFIERS BASED ON PHOTONIC CRYSTAL FIBER AND STANDARD SINGLE MODE FIBER

2007 ◽  
Vol 21 (02n03) ◽  
pp. 115-122
Author(s):  
TAO SHANG ◽  
JIANPING CHEN ◽  
XINWAN LI ◽  
JUNHE ZHOU
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
High Gain ◽  
Gain Medium ◽  
Single Mode Fiber ◽  
Numerical Comparison ◽  
Raman Gain ◽  
Crystal Fiber ◽  
Raman Amplifiers

This paper presents a numerical analysis and comparison on the performance of multi-pump gain-flat Raman amplifiers based on triangular photonic crystal fiber and conventional fiber. It is demonstrated that the extra 5.93 dB Raman net gain can be achieved in the L-band when PCF acts as Raman gain medium. The noise performance of the two amplifiers are also calculated and compared. Comparison with the data of published literature was also carried out to verify our analysis. The results showed that PCF is the appropriate candidate for high gain Raman amplifiers.

scholarly journals THEORETICAL EVALUATION OF NONLINEAR EFFECTS ON OPTICAL WDM NETWORKS WITH VARIOUS FIBER TYPES

2010 ◽  
Vol 9 (2) ◽  
pp. 53-66 ◽  
Author(s):  
YASIN M. KARFAA ◽  
M. ISMAIL ◽  
F. M. ABBOU ◽  
A. S. SHAARI
Keyword(s):  
Optical Fiber ◽  
Stimulated Raman Scattering ◽  
Fiber Type ◽  
Nonlinear Effects ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Wdm Networks ◽  
Fiber Types ◽  
Theoretical Evaluation ◽  
Wdm Network

A theoretical study is carried out to evaluate the performance of an opticalwavelength division multiplexing (WDM) network transmission system in the presenceof crosstalk due to optical fiber nonlinearities. The most significant nonlinear effects inthe optical fiber which are Cross-Phase Modulation (XPM), Four-Wave Mixing (FWM),and Stimulated Raman Scattering (SRS) are investigated. Four types of optical fiber areincluded in the analysis; these are: single-mode fiber (SMF), dispersion compensationfiber (DCF), non-zero dispersion fiber (NZDF), and non-zero dispersion shifted fiber(NZDSF). The results represent the standard deviation of nonlinearity induced crosstalknoise power due to FWM and SRS, XPM power penalty for SMF, DCF, NZDF, andNZDSF types of fiber, besides the Bit Error Rate (BER) for the three nonlinear effectsusing standard fiber type (SMF). It is concluded that three significant fiber nonlinearitiesare making huge limitations against increasing the launched power which is desired,otherwise, lower values of launched power limit network expansion including length,distance, covered areas, and number of users accessing the WDM network, unlesssuitable precautions are taken to neutralize the nonlinear effects. Besides, various fibertypes are not behaving similarly towards network parameters.

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.

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