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All optical linearization technique of DFB‐LD based on optical injection locking for RoF system
Author(s) -
Hong MoonKi,
Han SangKook
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22800
Subject(s) - laser diode , modulation (music) , optical modulation amplitude , distributed feedback laser , amplitude modulation , materials science , optics , linearization , optical fiber , optical carrier transmission rates , amplitude , diode , optoelectronics , laser , physics , frequency modulation , radio frequency , optical amplifier , telecommunications , computer science , radio over fiber , nonlinear system , acoustics , quantum mechanics
A novel all optical linearization technique using optical injection locking is proposed for radio‐over‐fiber system. When slave laser diode (SLD) is operated under injection locking condition, the modulated optical signals from master laser diode (MLD) are suppressed by residual amplitude modulation suppression. However, these signals are not completely suppressed by imperfection of residual amplitude modulation suppression and remained in the cavity of SLD. By appropriately controlling the phase and amplitude of these signals to have out‐of phase and the same magnitude condition compared with those of direct modulated optical signals from SLD, the efficiency of linearization of DFB‐LD can be more enhanced by optical cancellation in the SLD. By using the proposed technique, 17 dB enhancement of carrier‐to‐interference ratio was experimentally achieved up to frequency response of DFB‐LD compared with that of free‐running case. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2403–2406, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22800