公开(公告)号：US20220278751A1

公开(公告)日：2022-09-01

申请号：US17631412

申请日：2020-02-26

Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Yun Chur CHUNG ,  Sunghyun BAE ,  Byunggon KIM ,  Minsik KIM

IPC: H04B10/524 ,  H04B10/2581 ,  H04B10/50 ,  H04J14/08 ,  H04L25/03

Abstract: Disclosed are an optical-time-division-multiplexed transmission method and system using a simple sinusoidally modulated optical signal as an input pulse source. An optical-time-division-multiplexed transmission system comprises: an optical-time-division-multiplexed transmitter by applying a sinusoidal electrical signal, a first multi-level electrical PAM signal, and a second multi-level electrical PAM signal so as to generate an optical-time-division-multiplexed multi-level PAM signal; an optical detector for converting the transmitted optical-time-division-multiplexed PAM signal into an electrical signal; a time-division-demultiplexer for demultiplexing the detected electrical signal into two signals; a MIMO equalizer; and two decision elements for determining the levels of two demultiplexed signals obtained from the MIMO equalizer.

公开(公告)号：US20140308034A1

公开(公告)日：2014-10-16

申请号：US13929110

申请日：2013-06-27

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Yun Chur CHUNG ,  Hyeok Gyu CHOI ,  Jun Ho CHANG

IPC: H04B10/07

CPC classification number: H04B10/07953

Abstract: An optical signal quality monitoring apparatus includes an optical detector for directly receiving an optical signal modulated in an optical path and converting the optical signal to an electric signal, an asynchronous sampling unit for asynchronously sampling the electric signal of the optical detector at a reduced speed, and a digital signal processor for monitoring an optical signal quality by finding a synchronized amplitude histogram of data sampled in the asynchronous sampling unit. An optical signal quality monitoring method includes (a) a step of allowing an optical detector to directly receive a modulated optical signal and to convert the optical signal to an electric signal; (b) a step of allowing an asynchronous sampling unit to asynchronously sample the electric signal; and (c) a step of allowing a digital signal processor to monitor an optical signal quality by generating a synchronized amplitude histogram of sampled data.

Abstract translation: 光信号质量监测装置包括：光检测器，用于直接接收在光路中调制的光信号并将光信号转换为电信号;异步采样单元，用于以降低的速度异步采样光检测器的电信号， 以及数字信号处理器，用于通过找到在异步采样单元中采样的数据的同步振幅直方图来监视光信号质量。 光信号质量监测方法包括：（a）允许光检测器直接接收经调制的光信号并将光信号转换为电信号的步骤; （b）允许异步采样单元异步采样电信号的步骤; 以及（c）允许数字信号处理器通过产生采样数据的同步幅度直方图来监视光信号质量的步骤。

公开(公告)号：US20160204872A1

公开(公告)日：2016-07-14

申请号：US14993508

申请日：2016-01-12

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Yun Chur CHUNG ,  Hyun Kyu SHIM ,  Hoon KIM

IPC: H04B10/516 ,  H04J14/02 ,  H04B10/54

CPC classification number: H04B10/5162 ,  H04B10/5167 ,  H04B10/541 ,  H04J14/0282

Abstract: The present invention can operate a reflective semiconductor optical amplifier at ultrahigh speed using a polar return-to-zero (RZ) modulation method, and operate a reflective semiconductor optical amplifier (RSOA) whose modulation bandwidth is limited at ultrahigh speed by generating signals vertically symmetrical using a newly suggested polar RZ signal generator when generating an amplitude modulation signal at a transmission end. The present invention can overcome the problem that a modulation speed cannot be increased to 10 Gb/s or above due to signal distortion by inter-symbol-interference when generating an ultrahigh speed amplitude modulation signal using an RSOA of low price having a very narrow modulation bandwidth in an RSOA-based optical network. Also, the present invention has an effect of receiving the generated amplitude modulation signal through a direct detection receiver which is cost-effective and simple, and further has an effect of enabling ultrahigh speed operation of the RSOA-based WDM PON.

Abstract translation: 本发明可以使用极性归零（RZ）调制方法以超高速操作反射式半导体光放大器，并且通过产生垂直对称的信号来操作调制带宽被限制在超高速度的反射半导体光放大器（RSOA） 在传输端产生幅度调制信号时，使用新推荐的极坐标RZ信号发生器。 本发明可以克服当使用具有非常窄的调制的价格低廉的RSOA生成超高速幅度调制信号时，由于符号间干扰的信号失真，调制速度不能提高到10Gb / s以上的问题 基于RSOA的光网络中的带宽。 此外，本发明具有通过成本效益和简单的直接检测接收机接收生成的幅度调制信号的效果，并且还具有能够实现基于RSOA的WDM PON的超高速操作的效果。

公开(公告)号：US20230216585A1

公开(公告)日：2023-07-06

申请号：US17775207

申请日：2020-03-03

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Yun Chur CHUNG ,  Byunggon KIM ,  Sunghyun BAE ,  Minsik KIM

IPC: H04B10/2513 ,  H04B10/516

CPC classification number: H04B10/2513 ,  H04B10/516

Abstract: Proposed are an optimal operation method of a high-frequency dithering technique for compensating for interference noise in an analog optical transmission-based mobile fronthaul network, and a transmitter using same. An interference noise compensation method using high-frequency phase dithering performed in an analog optical transmission-based mobile fronthaul network may include the steps in which: a frequency-multiplexed wireless signal is converted in an optical transmitter to an intensity-modulated optical signal; and the phase of the optical signal intensity-modulated in the optical transmitter is dithered with an Orthogonal Frequency-Division Multiplexing (OFDM) signal.