Patent ID: 6721506
Filing Date: 2004-04-13
Classification: H04J

Abstract:
A multiple-band broadcast service delivery method comprising:generating an optical carrier signal; filtering the optical carrier signal to provide a plurality of first-parts based on frequency spectra of the optical carrier signal; modulating each first-part of the plurality of first-parts to incorporate data in each of the plurality of first-parts; and combining the plurality of modulated first-parts into an optical transmission signal, wherein the step of combining the plurality of modulated first-parts into an optical transmission signal comprises: inputting a first modulated first-part into a first optical circulator via a first port of a first optical circulator; outputting the first modulated first-part from a second port of the first optical circulator; reflecting the first modulated first-part from a first reflector back into the second port of the first optical circulator; outputting the first modulated first-part from a third port of the first optical circulator; outputting the first modulated first-part from the third port of the first optical circulator past a second reflector, which is transparent to the first modulated first-part and into a second port of a second optical circulator; and outputting the first modulated first-part from a third port of the second optical circulator along with a second modulated first-part.