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Journal Article
Pseudo Optical PAM-N Signal Using Externally Modulated Lasers
- Authors
- Joon Young Huh, Joon Ki Lee, Sae-Kyoung Kang, Jyung Chan Lee
- Issue Date
- 2015-12
- Citation
- ETRI Journal, v.37, no.6, pp.1120-1128
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- We propose a pseudo optical N-level pulse-amplitude modulation (PO PAM-N) signal using a few externallymodulated lasers (EMLs) operating at different wavelengths, which is suitable for upgrading the transmission speed over an optical link of < 10 km singlemode fiber with low-cost components. To compare a PO PAM-N signal with that of a standard optical PAM-N signal, we perform experiments for evaluating the performance of a 51.56-Gb/s PO PAM-4 signal and standard 51.56-Gb/s optical PAM-4 signal. The receiver sensitivity (at BER = 10창?궗"5) of the PO PAM-4 signal is 1.5 dB better than the receiver sensitivity of a standard optical PAM-4 signal. We also investigate the feasibility of PO PAM-N (N = 4, 8, and 16) signals operating at 103.12 Gb/s, considering relative intensity noise, timing jitter, extinction ratio (ER) of EMLs, and dispersion. From the results, a PO PAM-8 signal performs better than PO PAM-4 and PO PAM-16 signals at 103.12 Gb/s. Finally, we suggest a timing control method to suppress the effect of dispersion in a PO PAM-N signal. We show that the tolerance to dispersion of a 103.12-Gb/s PO PAM-8 signal can be improved to 챦짹40 ps/nm by applying a proposed scheme.
- KSP Keywords
- 4-level pulse amplitude modulation(PAM-4), Different wavelengths, Low-cost, Relative intensity noise, Transmission speed, control method, externally modulated, extinction ratio, optical link, receiver sensitivity, timing control