Suppression of phase noises with residual-spectra eliminator in circulator-free fiber-grating optical code-division multiple-access network coder/decoder
Optical Engineering: The Journal of SPIE
In this work, transmissive spectral characteristics of fiber Bragg gratings ͑FBGs͒ are applied to construct a circulator-free scheme of an optical code-division multiple-access ͑OCDMA͒ network coder/ decoder ͑codec͒. The unnecessary spectra would accompany the coding chips to arrive at the photodetectors ͑PDs͒ to induce higher phaseinduced intensity noise ͑PIIN͒ and multiple-access interference ͑MAI͒. A residual-spectra eliminator ͑RSE͒ between OCDMA encoder and decoder modules is employed to
... es is employed to remove the unnecessary spectral parts of data so that the PIIN and MAI can be reduced. A simple experiment performed on the basis of transmissive spectral characteristics of FBGs together with RSE is demonstrated to verify the capability of suppressing residual-spectra noise at the PDs. Performance evaluations indicate that using RSE between network codecs can remarkably lower the PIIN effects in the receiver PDs.