OPTICS 2015 Abstracts


Full Papers
Paper Nr: 7
Title:

Performance Analysis of a WDMA Protocol with a Multiple Tunable Receivers Node Architecture for High-speed Optical Fiber Lans

Authors:

Peristera A. Baziana

Abstract: A synchronous transmission WDMA protocol for high-speed optical fiber LANs of passive star topology is studied in this paper. The packet rejection at destination, referred as receiver collision, is extensively examined. A network interface with more than one tunable receivers per destination station is considered. This means that each station is capable of receiving more than one data packets during a time frame. The presented WDMA protocol expands previous studies about the receiver collision phenomenon that assume a single tunable receiver per station, while it provides an analytical framework about its effect on the total network performance. The average throughput and rejection probability are analytically derived, while the bandwidth utilization improvement provided by the use of the multiple tunable receivers station interface is estimated. The analysis considers Poisson arrivals and finite station population. Numerical results are comparatively studied for various numbers of data channels and stations.

Paper Nr: 16
Title:

Time Synchronization in XG-PON Systems: An Error Analysis

Authors:

Panagiotis Sarigiannidis, Georgios Papadimitriou, Petros Nicopolitidis, Emmanouel Varvarigos and Malamati Louta

Abstract: Synchronization in modern optical systems is of paramount importance. The sharing of a common time between different network components constitutes a crucial factor towards system stability. Latest advancements in optical access networks, such as Passive Optical Networks (PONs), allow transmission rates of 10 Gbps. Hence, a very accurate synchronization method is required in order to keep the network free of blocking and collisions. In this work, we focus on 10-gigabit-capable passive optical network (XG-PON) systems, one of the most popular standards for PONs. A rigorous analytic approach is devised so as to investigate the required precision of underlying synchronization method. Closed equations for computing the no blocking and blocking probabilities are developed. The devised analytic framework is verified using simulation methods.

Short Papers
Paper Nr: 9
Title:

Pulley-type Ring Resonator and Optimization

Authors:

Dong-Po Cai, Chii-Chang Chen and Chien-Chieh Lee

Abstract: In this work, we propose a guideline to design the high Q-factor ring resonators. To keep the optical energy in the ring, the radiation loss of the ring should be reduced. The difference of the propagation constant between the bus waveguide and the ring should be enlarged to prevent from the light in ring to be coupled back to the bus waveguide. The phase difference of the light between the bus waveguide and ring should be adjusted to obtain the destructive interference at the output port (critical coupling). From these points mentioned above, we compare the 6 types of ring resonators. We conclude that the high Q-factor pulley-type ring resonator can be more easily designed. The experimental Q-factor of the pulley-type ring resonators with ring radius of only 4.43μm can be obtained up to 1.73×105.

Paper Nr: 10
Title:

Amplitude Modulation by Superposition of Independent Light Sources

Authors:

Gilbert Johannes Martin Forkel and Peter Adam Hoeher

Abstract: Visible light communication (VLC) is a promising alternative to radio waves, when high data rates are required over short distances. Using lighting equipment for communication offers very high receive power values without consuming additional energy than already required for illuminating the environment. The bandwidth restriction of the employed light-emitting diode (LED) light sources is one limiting factor to exploiting the channels potential capacity. In this paper, we propose spatially distributed modulation schemes to increase the data rate by switching the LEDs of the lighting equipment individually. Towards this goal, three different techniques for superposition of independent light sources are compared.

Paper Nr: 14
Title:

Polarization Dependent Loss Emulator Built with Computer-driven Polarization Controllers and Single Mode Fibre

Authors:

Yangzi Liu, Peter Shepherd and Duncan Allsopp

Abstract: In this paper, a polarization dependent loss emulator is designed with computer-driven polarization controllers and single mode fibre. It proves that PDL obeys Maxwellian distribution when it is expressed in decibels. By positioning the polarization controllers at different places in the emulator link, it also proves that positions of PDL components have a significant effect on the statistics of PDL in a fixed length communication system. As the number of polarization components involved and the communication fibre length remain as constants, the longer the uninterrupted fibre is, the smaller the PDL mean value is produced.

Posters
Paper Nr: 13
Title:

Measurement of the Distributed Strain and Temperature by Modeling the Brillouin Spectrum

Authors:

Mohamed Bouyahi, Amira Zrelli, Houria Rezig and Tahar Ezzedine

Abstract: Actually, Structural health monitoring (SHM) presents an important field of researches, since we can monitor many civil structures using optical fiber sensors which give us the opportunity to explore the effect of shifting many parameters to detect and measure the influence of both temperature and strain in sensing fiber, we choose to work on Brillouin-scattering-based distributed sensor. In this paper, we make out the influence of shift temperature and strain in Brillouin scattering. The study proves the importance of Brillouin coefficients by fixing all of them. The Brillouin Spectrum will be modulating with Matlab codes.

Paper Nr: 15
Title:

Impact of Optical Preamplifier Beat Noise on Inter-Satellite Coherent Optical Communication System

Authors:

Xiangnan Liu, Chengyong Xiang, Liang Zhang and Yingfei Li

Abstract: The performance of Inter-Satellite coherent optical communication systems is partly limited by the beat noise between the amplified spontaneous emission (ASE) noises and local oscillator. In order to improve the optical detection sensitivity in inter-satellite optical communication links, a model of inter-satellite coherent optical communication is established. And the origin of noise in this system with optical pre-amplifier is investigated. The impact of optical pre-amplifier key parameters on performance of inter-satellite coherent optical communication systems is discussed. Besides, bit error rate (BER) versus signal power, noise figure and gain are numerically calculated. The results illustrated that it is effective to improve the optical detection sensitivity and degrade the bit error rate using an optical pre-amplifier with low noise figure.