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Effect of rotational misalignment in phase-plate based mode multiplexer

We experimentally investigate the optical signal-to-noise ratio penalty induced by the rotational misalignment of the phase plates in …

Changyo Han, Hwan Seok Chung, Sun Hyok Chang, Kwangjoon Kim, Jong Hyun Lee

Investigaitons of EVM Performance Degradations caused by Nonlienarity in Mobile Fronthaul Architecture based on IFoF technology

We investigated analog optical transmission performance degradation caused by nonlinear distortion by varying several operating …

Seung-Hyun Cho, Hwan Seok Chung, Changyo Han, Sangsoo Lee, Jong Hyun Lee

Design of RoF based Mobile Fronthaul Link with Multi-IF Carrier for LTE/LTE-A Signal Transmission

We report a design of RoF based mobile fronthaul link considering quality of optical link and LTE/LTE-A signal simultaneously. The …

Hwan Seok Chung, Seung-Hyun Cho, Changyo Han, Sangsoo Lee, Jyung Chan Lee, Jong Hyun Lee

DP-16QAM과 4x4 MIMO 신호처리를 이용한 모드분할다중화 광 송수신 실험

Hwan Seok Chung, Sun Hyok Chang, Changyo Han, Kwangjoon Kim, Jyung Chan Lee, Jong Hyun Lee

위상 판을 이용한 모드 다중화기의 구현

Changyo Han, Hwan Seok Chung, Sun Hyok Chang, Kwangjoon Kim

Influence of Channel Misalignment of Time-interleaved DAC on Sensitivity Degradation in Coherent Optical Receivers

The time-interleaved architecture is indispensable for high-speed digital-to-analog converters (DACs) in coherent optical transmitters. …

Changyo Han, Koji Igarashi, Kazuro Kikuchi

Novel Polarization-diversity Scheme Based on Mutual Phase Conjugation for Fiber-nonlinearity Mitigation in Ultra-long Coherent Optical Transmission Systems

We propose a novel method of fiber-nonlinearity mitigation for ultra-long optical transmission systems, which employs two polarization …

Hongbo Lu, Kazuro Kikuchi, Changyo Han, Yojiro Mori

Wavelength Demultiplexing of Nyquist WDM Signals under Large Frequency Offsets in Digital Coherent Receivers

We propose a novel wavelength-demultiplexing algorithm applicable to Nyquist WDM systems. The proposed scheme features the ability of …

Yojiro Mori, Changyo Han, Hongbo Lu, Kazuro Kikuchi

ナイキストWDM信号におけるチャンネル間クロストークペナルティーの適応FIRフィルタによる抑圧

Daiki Hiraoka, Changyo Han, Kazuro Kikuchi

Influence of channel misalignment of time-interleaved DAC on sensitivity degradation in coherent receivers

Changyo Han, Koji Igarashi, Kazuro Kikuchi