METHOD AND APPARATUS FOR SIMULTANEOUS TRANSMISSION OF DIGITAL TELEPHONY AND ANALOG VIDEO USING WAVE DIVISION MULTIPLEXING

摘要

Downstream digital telephony signals are transmitted over the 1310 nm transmission band of a silica optic fiber (110). Upstream digital telephony signals are transmitted over a "short wavelength" portion of the 1550 nm transmission band of the optic fiber (110), i.e. within a portion of the 1550 nm transmission band having wavelengths less than a predetermined threshold wavelength of 1550 nm. Simultaneously, downstream analog video signals are transmitted over a "long wavelength" portion of the 1550 nm transmission band of the optic fiber (110), i.e. within a portion of the 1550 nm transmission band having wavelengths exceeding the predetermined threshold wavelength of 1550 nm but still within an erbium-doped fiber amplifier gain profile.