Browsing by Author "Chu, Hsuan-Hao"

Now showing 1 - 6 of 6

32-dB Loss Budget High-Capacity OFDM Long-Reach PON over 60-km Transmission without Optical Amplifier
(2014-01-01)
Wei, Chia-Chien
;
Chen, Hsing-Yu
;
Chu, Hsuan-Hao
;
Chen, Yu-Chao
;
Song, Cih-Yuan
For the first time, 33-Gbps 60-km OFDM transmission is demonstrated to show 32-dB loss budget without inline and pre-amplifier. Employing 10-GHz EAM and PIN, the long-reach PON can economically support 32 ONUs with >1-Gbps/ONU capacity.
50-Gbps 100-km EAM-based OFDM-IMDD Transmission Employing Novel SSII Cancellation
(2014-01-01)
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Chen, Yu-Chao
;
Chu, Hsuan-Hao
;
Song, Cih-Yuan
We build a new SSII cancellation technique to compensate both modulator nonlinearity and dispersion-induced nonlinear distortion. Employing the SSII cancellation to optimize EAM operation, superior 50-Gbps EAM-based OFDM-IMDD transmission over 100-km SSMF is successfully demonstrated.
An EAM-based 50-Gbps 60-km OFDM System with 29-dB Loss Budget Enabled by SSII Cancellation or Volterra Filter
(2014)
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Chu, Hsuan-Hao
;
Chen, Yu-Chao
;
Lu, I-Cheng
Different nonlinear compensation techniques are compared for the first time, and 57.5-Gbps 60-km IMDD OFDM transmission is achieved. The loss budget of 32 or 29 dB is demonstrated to support 40-Gbps 64-ONUs or 50-Gbps 32-ONUs over 60-km LR-PON without amplifiers.
Analysis of Nonlinear Distortion and SSII Cancellation in EAM-Based IMDD OFDM Transmission
(2015-07-15)
Wei, Chia-Chien
;
Cheng, Hsuan-Lin
;
Chen, Hsing-Yu
;
Chen, Yu-Chao
;
Chu, Hsuan-Hao
In terms of second-order nonlinearity, nonlinear distortion in an EAM-based IMDD OFDM system is deterministically modeled as subcarrier-to-subcarrier intermixing interference ( SSII), such that DSP-based nonlinear compensation can be provided by decision-aided SSII cancellation at the receiver. The effectiveness of SSII cancellation heavily relies on the accuracy of SSII calculation, which is determined mainly by the modulation model adopted. This study made comprehensive comparisons of three small-signal models (constant-chirp, dynamic-chirp, and nonlinear-E/O models). We then combined theory and experiment results to examine the characteristics of SSII estimation and cancellation using various models, such as SSII spectra, regression coefficients, and correlation coefficients between the SSII and the total received errors, as well as the relationship between improvements in performance and the correlation coefficient. The nonlinear-E/O model is the most comprehensive, and as a result presents the flattest regression coefficient and highest correlation coefficient, which results in the most pronounced improvement in performance.
EAM-based high-speed 100-km OFDM transmission featuring tolerant modulator operation enabled using SSII cancellation
(2014-06-16)
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Lu, I-Cheng
;
Chen, Yu-Chao
;
Chu, Hsuan-Hao
In this study, a technique was developed to compensate for nonlinear distortion through cancelling subcarrier-to-subcarrier intermixing interference (SSII) in an electroabsorption modulator (EAM)-based orthogonal frequency-division multiplexing (OFDM) transmission system. The nonlinear distortion to be compensated for is induced by both EAM nonlinearity and fiber dispersion. Because an OFDM signal features an inherently high peak-to-average power ratio, a trade-off exists between the optical modulation index (OMI) and modulator nonlinearity. Therefore, the nonlinear distortion limits the operational tolerance of the bias voltage and the driving power to a small region. After applying the proposed SSII cancellation, the OMI of an OFDM signal was increased yielding only a small increment of nonlinear distortion, and the tolerance region of the operational conditions was also increased. By employing the proposed scheme, this study successfully demonstrates 50-Gbps OFDM transmission over 100-km dispersion-uncompensated single-mode fiber based on a single 10-GHz EAM. (C)2014 Optical Society of America
High-Capacity and High-Loss-Budget OFDM Long-Reach PON Without an Optical Amplifier
(2015-01-01)
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Lu, I-Cheng
;
Chu, Hsuan-Hao
;
Chen, Yu-Chao
This work utilizes high launch power and the corresponding self-phase modulation (SPM) effect to combat dispersion-induced power fading and the insufficient loss budget of an intensity modulation and direct detection (IMDD) orthogonal frequency division multiplexing (OFDM) 60 km long-reach passive optical network (LR-PON). In addition, based on the proposed comprehensive transmission model, the subcarrier-to-subcarrier intermixing interference (SSII) cancellation scheme is applied to simultaneously eliminate the nonlinear distortions caused by the interplay among dispersion, the SPM effect, and the modulator-induced nonlinearity and chirp. Thanks to the high launch power and SSII cancellation, 40 and 50 Gbps 60 km OFDM transmission is successfully demonstrated to show 33 and 28 dB loss budgets, respectively, without an inline amplifier or preamplifier. Hence, by employing a 10 GHz electro-absorption modulator and PIN detector, the proposed LR-PON can economically support 64 or 32 optical network users with a capacity of 50 or 40 Gbps.