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.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering