Patent ID: 9729950
Date: 2017-08-08
CPC Classifications: H04J,H04L,H04Q

Claim:
1. A method comprising: receiving, at an optical system, a feeder optical signal and optical network unit signals; and multiplexing/demultiplexing, at the optical system, between the feeder optical signal and the optical network unit signals, wherein for a first period of time, the feeder optical signal comprises a first optical line terminal signal comprising a wavelength in a first upstream free spectral range and a wavelength in a first downstream free spectral range, and each optical network unit signal comprises a first upstream wavelength in the first upstream free spectral range and a first downstream wavelength in the first downstream free spectral range, and wherein for a second period of time subsequent to the first period of time, the feeder optical signal comprises the first optical line terminal signal and a second optical line terminal signal, the second optical line terminal signal comprising a wavelength in a second upstream free spectral range and a wavelength in a second downstream free spectral range, and each optical network unit signal comprises the first upstream wavelength in the first upstream free spectral range, the first downstream wavelength in the first downstream free spectral range, a second upstream wavelength in the second upstream free spectral range, and a second downstream wavelength in the second downstream free spectral range.