Jong-Kyun Hong

1

This paper introduces a wavelength multiplexer (MUX) using the extraneous self-imaging (Ex_SI) phenomenon, which is not mentioned in multimode-interference theory. The Ex_SI phenomenon in silica-based multimode waveguides was experimentally studied. Then, using data for the Ex_SI phenomenon, the wavelength MUX for the wavelengths of 1310 and 1550 nm was developed. The optimum length of the multimode waveguide, with a width of 18 mum, was confirmed as a 3670- mum wavelength MUX. For the wavelengths of 1310 and 1550 nm, the excess losses were determined to be -0.4 and -0.45 dB, respectively, while the extinction ratios were 16.9 and 19.7 dB, respectively

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We theoretically demonstrate spontaneous PT-symmetry breaking behavior of surface-plasmon polaritons (SPP) in coupled double-slab (DS) waveguides. By virtue of a flat-top field at critical wavelength, the imaginary index of a DS-SPP mode can be controlled via changing the core thickness, while the real index is kept constant. Therefore, a waveguide coupler that consists of a pair of DS-SPP waveguides with different core thicknesses can represent a passive PT-symmetric system, which always maintains symmetry under a real potential. This set-up also represents a good opportunity to investigate the underlying physics of PT-symmetry breaking in non-Hermitian Hamiltonian systems.

2 Wavelength Multiplexer With High Transmittances Using Extraneous Self-Imaging Phenomenon

A novel low-power thermo-optic MMI-MZI switch is presented. It consists of two different MMI couplers and phase shifting arms between them. It has been designed to utilize a modal phase shift of 90-degrees one each arm at every switching in turn and hence a half driving power of previous switches with similar device structures. This could be achieved by making the phase of input signals to the arms identical. The switching speed is also expected to be much faster due to the reduced power consumption.

Parity-time-symmetry breaking in double-slab surface-plasmon-polariton waveguides.

We suggest a compact and efficient duplexer using the multimode interference (MMI) effect and the extraneous self-imaging phenomenon for gigabit-capable passive optical network and gigabit Ethernet passive optical network applications. To experimentally evaluate the suggested duplexer, silica-based MMI couplers were tested using light sources with wavelengths of 1310 and 1490 nm. From the experimental results, this device showed relative output powers of -0.3 and -0.7 dBm for the light sources with 1490 and 1310 nm wavelengths, respectively. The return power was measured to be less than -40 dBm.

Low-power thermo-optic silica-on-silicon MZI switch using multimode interference couplers

In this paper researched precise accurate Time Stamping for positioning. Though existing Time Stamping only executed at the WLAN MAC layer, this paper suggest time stamping method using the additional TPU to minimize messages transmit delay for precise time detection between MAC and PHY.

Planar-lightwave-circuit-based duplexer for gigabit-capable passive optical network/gigabit Ethernet passive optical network applications

Silica-based

Time stamping method using additional TPU for improvement of positioning precision

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Silica-Based MMI-MZI Thermo-Optic Switch with Large Tolerance and Low PDL

thermo-optic (TO) switch using the MMI couplers which have a large fabrication tolerance of 110 (

A study of a less sensitive positioning method to forms of AP placements

{\mu}m

PLC-based compact wavelength filter to apply G-/ GE-PON

were fabricated and operated. Important features of the proposed switch are shown to be a polarization dependency loss of 0.1dB, an extinction ratio of 32.7dB, and a power consumption of 202.8mW.