Analytical Treatment of the Ring Resonator Passive Systems and Bandwidth Characterization Using Directional Coupling Coefficients

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We have shown that an add/drop system connected to a single microring resonator could be constructed using the fiber optics, where it can be used to generate a single soliton carrier, in which the tuning and manipulation of the bandwidth is performed to control the output signals. The chaos filtering via the add/drop device is implemented by using suitable parameters of the system. The coupling coefficient of the system is considered to be an effective parameter to determine the output intensity power of the system. In order to optimize the system, the smaller coupling coefficient is required. The bandwidth of the generated pulse changes respects to variation of the coupling coefficient. Here the chaotic signals which are used widely in communication, for variation of coupling coefficients is analyzed. To recover the pulses from the chaotic noises in the fiber ring resonator, we use the add/drop filter system with the appropriate parameters, where the insertion loss and gain of the system is measured. As a result, the increase of the coupling coefficients leads to increase of the bandwidth of the soliton pulse. In order to use ultra-short soliton pulses applied in optical communication, lower coupling coefficient is admired where, the power control can be performed within the system.

Science

Analytical Treatment of the Ring Resonator Passive Systems and
Bandwidth Characterization Using Directional Coupling Coefficients
I. S. Amiri1*
, S. E. Alavi2
, F. J. Rahim3
, S. M. Idrus2
, and J. Ali1
1
Institute of Advanced Photonics Science, Nanotechnology Research Alliance, Universiti
Teknologi Malaysia (UTM), 81310 Johor Bahru, Malaysia
2
Lightwave Communication Research Group, Faculty of Electrical Engineering, Universiti
Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
3
Faculty of Electrical Engineering, University Teknologi Malaysia (UTM),
81310 UTM Skudai, Johor , Malaysia
*Corresponding author: isafiz@yahoo.com
ABSTRACT:
We have shown that an add/drop system connected to a single microring resonator
could be constructed using the fiber optics, where it can be used to generate a single soliton
carrier, in which the tuning and manipulation of the bandwidth is performed to control the
output signals. The chaos filtering via the add/drop device is implemented by using suitable
parameters of the system. The coupling coefficient of the system is considered to be an
effective parameter to determine the output intensity power of the system. In order to
optimize the system, the smaller coupling coefficient is required. The bandwidth of the
generated pulse changes respects to variation of the coupling coefficient. Here the chaotic
signals which are used widely in communication, for variation of coupling coefficients is
analyzed. To recover the pulses from the chaotic noises in the fiber ring resonator, we use the
add/drop filter system with the appropriate parameters, where the insertion loss and gain of
the system is measured. As a result, the increase of the coupling coefficients leads to increase
of the bandwidth of the soliton pulse. In order to use ultra-short soliton pulses applied in
optical communication, lower coupling coefficient is admired where, the power control can
be performed within the system.
Keywords: Chaotic control; Single soliton bandwidth; Coupling coefficient

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The aim of this study is to generate nano optical tweezers to be connected to an optical quantum signal processing system in order to transmit quantum photon via an optical communication link. A system of microring resonator (MRR) known as Half-Panda is proposed to generate nano optical tweezers. Optical tweezers can be used to transport molecules in a communication link. The dark soliton propagates inside nonlinear MRR. Transportation of molecules or photons is implemented when the dark soliton is used as input pulse. The input Gaussian soliton is used to control the output signal at the through and drop ports of the system. Output nano optical tweezers can be connected to the quantum signal processing system consisting of a receiver and transmitter. The receiver will detect the signals of optical tweezers and transmit them via wired/wireless as quantum bits. The transmitter will generate the entangled photon pair which propagates via an optical communication link. Here the smallest nano optical tweezers signals with width at half maximum (FWHM) of 4.2 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.

Single Soliton Bandwidth Generation and Manipulation by Microring Resonator

University of Malaya (UM)

In this paper, we propose a system for chaotic signal generation using a microring resonator (MRR) fiber optic system. This system uses a regular laserdiode as input power and can be incorporated with an optical add/drop filter system. When light from the laser diode feedbacks to the fiber ring resonator, the actual chaotic signal is produced by using the appropriate fiber ring resonator parameters and also the laser diode input power. The filtering process of the chaotic signals occurs during the round-trip of the pulse within the ring resonators. The single soliton pulses generation and bandwidth manipulation of the pulse can be performed using the add/drop system. Results obtained have established particular possibilities from the application. The obtained results show the effects of coupling coefficients on the bandwidth of the single soliton pulse, where the chaotic behaviors of the input pulses are presented.

Chaotic Signal Generation and Trapping Using an Optical Transmission Link

University of Malaya (UM)

Chaotic soliton can be generated using a nonlinear PANDA system. The research uses microring resonator (MRR) to generate and trap chaotic signals along fiber optic communication. The parameters such as refractive indices of a silicon waveguide, coupling coefficients ( ), coupling loss, radius of the ring (R) and the input power can be selected properly to operate the nonlinear behavior. The input Gaussian laser pulses with power of 0.45 W are inserted into the system. The central wavelength of the input power has been selected to λ0=1.55 µm where the nonlinear refractive index of the medium is n2=1.3×10−17 m2 W−1 . The generated chaotic signals with Full at Half Maximum of 24 pm can be transmitted along the fiber optic with length of 195 km. The trapping of chaotic signals can be obtained at the end of the transmission link. Here signals with 600 fm bandwidth could be trapped within the system.

LOGIC CODES GENERATION AND TRANSMISSION USING AN ENCODING-DECODING SYSTEM

University of Malaya (UM)

Nonlinear behaviors of light such as chaos can be observed during propagation of a Gaussian laser beam inside a single ring resonator system. Chaotic signals can be employed to generate data of logic codes to be transmitted along the fiber optic communication. Controlling of the chaotic signals can be implemented by the parameter of the system such as coupling coefficient, the ring’s radius, coupling loss and input power. The central wavelength of the input Gaussian laser pulse has been selected to λ0=1550 nm where the nonlinear refractive index of the medium is n2=1.4×10−13 m2 W−1. Therefore the data of logic codes generated by the single ring resonator system can be converted to transmitting secured codes where the decoding process of the transmitted codes can be obtained at the end of the transmission link. Here generation of logic code of “101010101011010101011101011110101101010101010110101” is performed, encoded and decoded over 50 km fiber optics. Thus secured transmitting of signals can be obtained along the long distance fiber communication.

Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...

University of Malaya (UM)

A system of Half-Panda microring resonator (MRR) is proposed to generate ultra-short nanometer (nm) optical tweezers. The dark soliton propagates inside nonlinear MRR. Molecules or photons transport within the system when the dark soliton is used as input pulse. Nano optical tweezers can be generated and used to many applications in optical communication networks. Here the smallest nano optical tweezers signals with full width at half maximum (FWHM) of 9 nm is obtained where the free spectrum range (FSR) of 50 nm is simulated.

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