RFoG Return Receiver OBI Mitigation via Wavelength Segmentation

The patent segments the combined optical signal into multiple wavelength bands using optical filters or demultiplexers. Each wavelength band is detected separately by individual photodetectors, preventing the optical beat interference that occurs when multiple wavelengths are combined on a single detector. This segmentation maintains high data throughput while eliminating the harmful interference effects.

The patent introduces optical filters or wavelength division multiplexing components as intermediary elements between the combined optical signals and the detector. These intermediaries separate the overlapping wavelength bands before detection, allowing multiple signals to be transmitted simultaneously without causing optical beat interference, thus preserving both signal capacity and signal-to-noise ratio.

The patent applies local quality by assigning different detection characteristics to different wavelength regions. Optical filters with specific passbands are positioned at each detector to selectively pass only the intended wavelength range while rejecting others. This localized frequency selection allows close-frequency signals to coexist by ensuring each detector only processes its designated wavelength band, preventing OBI while maintaining high channel capacity.

The patent performs preliminary wavelength separation and filtering before the optical signals reach the detectors. By pre-sorting the combined optical signals into distinct wavelength channels using optical demultiplexers or filters, the system prevents optical beat interference from occurring in the first place. This preliminary action ensures that only signals within the desired frequency range reach each detector, maintaining both spectral efficiency and signal integrity.