The Kerr phase-interrogator: exploiting the nonlinear Kerr-effect for overcoming fundamental limitations in linear sensing approaches

2018 ◽  
Author(s):  
Chams Baker ◽  
Liang Chen ◽  
Xiaoyi Bao
Keyword(s):  
Kerr Effect ◽  
Fundamental Limitations ◽  
Nonlinear Kerr Effect

Soliton Pulse Generation for WDM-Based Free Space Optics Communication Using Microring Resonators

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Shahidinejad
Keyword(s):  
Free Space ◽  
Kerr Effect ◽  
Pulse Generation ◽  
Microring Resonator ◽  
Free Space Optics ◽  
Microring Resonators ◽  
Space Optics ◽  
Soliton Pulse ◽  
Chaotic Signals ◽  
Nonlinear Kerr Effect

AbstractA microring resonator (MRR) and an add/drop devices are presented to generate picosecond solitonic pulse and signal as multichannel localized wavelengths, applicable for WDM-based free space optics (FSO) communication. A Gaussian pulse is inputted to the first ring resonator of the proposed system. Because of the nonlinear Kerr effect, chaotic signals are created. The second MRR filters the generated signals and shape solitonic pulses, where the accurate FWHM of 20 ps with intensity of 2.45 W are obtained. The add/drop device is applied for tuning the solitonic pulses. Results indicate that a range of solitonic wavelengths from 1550 nm to 1600 nm are obtained, where FSR and FWHM are 144 pm and 5 pm, respectively. Finally, performance of the proposed MRR system is evaluated in terms of bit error rate (BER) and Q factor. In the analysis, the proposed solitonic pulse is compared to conventional counterparts. Using the proposed MRR system, BER and Q factor of WDM-based FSO are considerably improved.

Theory for the Nonlinear Magneto-Optical Kerr-Effect at Ferromagnetic Transition Metal Surfaces

1993 ◽  
Vol 313 ◽  
Author(s):  
U. Pustogowa ◽  
W. Hübner ◽  
K. H. Bennemann
Keyword(s):  
Kerr Effect ◽  
Magnetic Films ◽  
Orbit Interaction ◽  
Optical Kerr Effect ◽  
Ferromagnetic Transition ◽  
Previous Theory ◽  
Thin Magnetic Films ◽  
Nonlinear Kerr Effect ◽  
Linear And Nonlinear ◽  
Magneto Optical Kerr Effect

ABSTRACTThe nonlinear Magneto-optical Kerr-effect (NMOKE) has been proven to be an ultrafast spectroscopie probe of the magnetic and electronic properties of ferromagnetic surfaces. Extending our previous theory we calculate the linear and nonlinear Magneto-optical Kerr-spectra of Fe. The results for the nonlinear Kerr spectra are compared with recent experiments on a Fe (110) surface. We derive and discuss general features of the nonlinear Kerr-effect, especially the details of its dependence on exchange interaction and Fermi-level crossings in the Stoner picture and beyond, frequency, and spin-orbit interaction. Furthermore we demonstrate how various electronic material properties, such as d-band width, s-d hybridization or band narrowing due to electronic correlations or caused by geometry (reduced coordination number in thin films), can be extracted from the spectra. As an example, we compare the linear and nonlinear Kerr-spectra of Fe to those of Ni. The extension of our theory to the Kerr spectra of thin magnetic films films as well as of hidden magnetic interfaces occurring in sandwiches and multilayers is discussed.

Design of a photonic crystal optical limiter using nonlinear Kerr effect

2011 ◽  
Author(s):  
Mohammad Danaie ◽  
Hassan Kaatuzian ◽  
Hossein Shokri Kojori
Keyword(s):  
Photonic Crystal ◽  
Kerr Effect ◽  
Optical Limiter ◽  
Nonlinear Kerr Effect

scholarly journals Modeling of Ultra-Long Span Bidirectional Raman Transmission Link Using Three-Segment Hybrid Fiber Core Structure

Photonics ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 2 ◽  
Author(s):  
Ibrahim Syuaib ◽  
Muhamad Asvial ◽  
Eko Tjipto Rahardjo
Keyword(s):  
Kerr Effect ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Core Area ◽  
Transmission Performance ◽  
Hybrid Fiber ◽  
Signal To Noise ◽  
Long Span ◽  
Nonlinear Kerr Effect ◽  
Noise Ratio

Ultra-long span unrepeatered systems using distributed Raman amplification are cost-effective solutions for bridging moderate transmission distances. However, there are two major limiting factors: nonlinear Kerr effect-induced nonlinear signal distortion and optical signal-to-noise ratio degradation due to spontaneous Raman noise. In this report, we proposed a model of three-segment hybrid fiber effective core area structure and developed a model covering: (1) generalized mathematical formulations, (2) analysis of three-segment Raman amplified link, and (3) simulation model of data transmission. The proposed model showed an improvement of the Raman gain profile, a reduction of the negative impact of the nonlinear Kerr effect, and an enhancement of the optical signal-to-noise ratio. A numerical simulation of the transmission performance of the three-segment hybrid structure was compared to conventional single-segment single fiber core structure on 80 Gb/s differential quadrature phase-shift keying (DQPSK) modulated data signals over a propagation distance of 390 km. The required optical signal-to-noise ratio was reduced by 2.71 dB to achieve the target error rate without using forward error correction. The numerical model and simulation of various data rates up to 100 Gb/s consistently showed that an improvement in transmission performance could be achieved by using three-segment hybrid fiber effective core area structure.

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