Session Index

Delay-division-multiplexing (DDM) is an innovative technique in optical access networks, which
employs signal preprocessing to detect data through sub-Nyquist analog-to-digital sampling. DDM
relies on preallocated relative sampling delays among optical network users in orthogonal
frequency-division multiplexing (OFDM) systems. In this presentation, we will delve the core
concept, key features, and diverse applications of DDM. For instance, we will explore the potential
for employing hybrid sub-Nyquist sampling rates, allowing the accommodation of heterogeneous
services with varying capacities in an access network. Furthermore, in tandem with optical shaping
techniques, DDM exhibits the capacity to significantly reduce the requisite analog bandwidth,
facilitating cost-effective sub-Nyquist analog-to-digital sampling at receivers and even sub-Nyquist
digital-to-analog sampling at transmitters for optical network users. Additionally, we will examine
the implementation of DDM schemes across diverse scenarios, encompassing fronthaul optical
links and high-loss-budget long-reach passive optical networks.

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We evaluate the performance of optical label recognition for two-symbol QPSK-coded labels using complex-valued neural network. The performance is measured by crosstalk, defined as the intensity difference between the minimum and the second minimum intensities at the desired output port, by changing the amplitude and phase of the incident QPSK labels. Numerical simulation reveals that the amplitude deviation should be within -15% to +5% for crosstalk below -20 dB while the phase deviation does not affect the crosstalk.

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This article proposes wavelength routing domain structure that uses wavelength routers in recursive configuration. Then, it discusses scalability of proposed structure by analyzing several features of path loss application area size. Results showed the feasibility of the proposed structure.

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This paper shows the feasibility of Frequency Hopping Spread Spectrum (FHSS) to work on a terahertz wireless communication system. It uses the 2Gaud bandwidth transmitted signal with Orthogonal Frequency Division Multiplexing. The signal will be received after passing through the wireless channel of 3 meters. The result shows that the bit-error rate at different hopping frequencies. Additionally, this paper provides the frequency range at terahertz band that can be served as the bandwidth of FHSS.

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We present a multi-zone fiber-optic perimeter intrusion detection system with each defended zone associated with an Fabry-Perot interferometer, which is formed by an intrusion-sensing fiber sandwiched by two fiber Bragg gratings. Different Fabry-Perot interferometers operate at different wavelengths. By analyzing the received back-reflected optical power that varies with intrusion-induced disturbance on the fiber, we can detect the intrusion event for any zone.

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High-speed PAM4 data has become the mainstream of fiber optic transmission in recent years. As the data rate escalates, the nonlinear effects begin to manifest themselves by degrading the quality of communication. The situation is particularly severe with respect to the effects of dispersion, the intensity of which can vary with the length of the optical fiber. To solve this problem, this research paper proposed an algorithm that attempts to compensate for the dispersion by the addition of dispersion-compensating fibers (DCFs) at different positions and with different lengths.

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Optical switches have evolved to achieve nanosecond (ns) and even picosecond (ps) switching speeds. Our research focuses on utilizing optical switches to enhance the Decoy State BB84 QKD system. We aim to validate our idea using the OPTSIM simulation software. The goal of this work is to increase the secure key rate using optical-switch-based polarization multiplexing.


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