Korea Advanced Institute of Science and Technology

Teralink Communications, Inc.

Korea Institute of Science and Technology

Chul Han Kim

Yun Chur Chung

Chang Hee Lee

Minkyu Je

Seung Kyun Shin

Seok-Tae Koh

Hongkyun Kim

Dae Kwang Jung

Jaesuk Choi

Jun Hang Lee

Jeongeun Lee

Yechan Park

A power and data receiver according to the present embodiment includes: a reception coil configured to receive a power data signal from a transmission coil; a power unit forming driving power from the power data signal; and a data demodulation unit configured to demodulate a data signal from the power data signal, wherein the reception coil operates adjacent to the transmission coil to the extent that a first resonant frequency and a second resonant frequency are formed between the reception coil and the transmission coil, and the reception coil operates at a frequency greater than or equal to the first resonant frequency and smaller than or equal to the second resonant frequency in relation to the transmission coil.

Wireless power and data transmission and reception apparatus

The present invention provides a method and an apparatus for monitoring optical signal to noise ratio (OSNR) in a wavelength division multiplexing optical transmission system. The present invention utilizes a polarization nulling method and a tunable optical bandpass filter in order to reliably monitor the OSNR by considering a finite polarization nulling ratio, polarization mode dispersion and non-linear birefringence of the optical system in real time measurement of the OSNR. Further, the tunable optical bandpass filter is controlled to filter all wavelength bands of wavelength division multiplexed signals. Since the invention may monitor a plurality of demultiplexed optical signals with a single apparatus, the overall cost of the OSNR monitoring equipment is significantly reduced.

OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method

The present invention relates to a method and apparatus for automatically monitoring an optical signal-to-noise ratio in which an arbitrarily polarized optical signal including an unpolarized ASE noise is inputted to a rotating quarter-wave plate and then to a rotating linear polarizer so that a maximum power and a minimum power of the signal outputted from the rotating linear polarizer can be detected, and the detected maximum power and minimum power is used for automatically monitoring the optical signal-to-noise ratio. The method for monitoring the optical signal-to-noise ratio (OSNR) using a polarization-nulling method, comprises the steps of: (a) linearly polarizing an arbitrarily polarized optical signal including an unpolarized ASE noise; (b) separating the optical signal and the ASE noise from the linearly polarized optical signal including the unpolarized ASE noise to measure a power of the optical signal and a power of the ASE noise included in a bandwidth of an optical signal; and (c) obtaining the optical signal-to-noise ratio (OSNR) using the measured optical signal power and ASE noise power.

Method and apparatus for monitoring optical signal-to-noise ratio (OSNR) using polarization-nulling method

A bidirectional add/drop optical amplifier used in wavelength division multiplexing (WDM) optical networks to suppress the power change resulting from the adding and dropping of optical signals using an all optical gain control includes two fiber Bragg gratings (FBGs) and a bidirectional add/drop optical amplifier module composed of an Arrayed Waveguide Grating (AWG) and two bidirectional optical amplifiers. The filtered amplified spontaneous emission (ASE) lights are lased with the two FBGs and then used to adjust the gain of the bidirectional amplifiers.

All-optical gain controlled bidirectional add/drop optical amplifier

This invention is to construct a bidirectional WDM add/drop amplifier module for transmitting WDMS in bidirection and for adding/dropping a signal in bidirection at each node in a WDM network system using a single N&times;N multiplexer. The bidirectional WDM add/drop amplifier module,comprises an 8&times;8 arrayed-waveguide grating,The 8&times;8 arrayed-waveguide grating,has, at each side, a WDMS input end L,or R,a WDMS output end L,or R,three separated signal input ends L,L,and L,or R,R,and R,and three separated signal output ends L,L,and L,or R,R,and R,One L,or R,of the separated signal input ends is designated as an added signal input end, one L,or R,of the separated signal output ends is designated as a dropped signal output end, and the separated signal output ends L,and L,or R,and R,except for the dropped signal output end connected to the signal input ends L,and L,or R,and R,at the same side. The WDM add/drop amplifier module,comprises a circulator,L,,R provided at both ends of 8&times;8 arrayed-waveguide grating,to distinguish paths of different WDMSs and to transmit through each path respectively, an unidirectional optical band pass filter,L or,R provided between the WDMS output end L,or R,of the 8&times;8 arrayed-waveguide grating,and the circulator,L,,R to eliminate a relative intensity noise, and a bidirectional signal amplifier,L or,R.

Simple bidirectional add/drop amplifier module based on a single multiplexer

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Kyungki-do, South Korea

Chul Han Kim