Method and apparatus for simultaneous transmission of digital telephony and analog video over a single optic fiber using wave division multiplexing

A system for communicating first and second types of signals over a single silica optic fiber using wave division multiplexing comprising:

• means for communicating a first type of signals through the silica optic fiber with the signals being restricted to a first portion of a first transmission band centered at about 1550 nm wherein the first portion has wavelengths exceeding a preselected threshold wavelength within the first band;
• means for communicating a second type of signals upstream through the optic fiber with signals being restricted to a second portion of the first band wherein the second portion has wavelengths less than the preselected threshold wavelength;
• and
• means for communicating the second type of signals downstream through the optic fiber with signals being restricted to a second band centered at about 1310 nm that is entirely separate from the first band.

A system for communicating both analog video and digital telephony over a single optic fiber using wave division multiplexing comprising:

• an analog video signal transmitter for transmitting analog video signals downstream through the optic fiber with the signals being restricted to a first portion of a first transmission band wherein the first portion has wavelengths exceeding a preselected threshold wavelength within the first band;
• an upstream digital telephony signal transmitter for transmitting digital telephony signals upstream through the optic fiber with signals being restricted to a second portion of the first band wherein the second portion has wavelengths less than the preselected threshold wavelength;
• and
• a downstream digital telephony signal transmitter for transmitting digital telephony signals downstream through the optic fiber with signals being restricted to a second band that is entirely separate from the first band.

A method for communicating both analog video and digital telephony over a single optic fiber using wave division multiplexing comprising the steps of:

• transmitting analog video signals downstream through the optic fiber with the signals being restricted by an analog video transmitter to a first portion of a first transmission band wherein the first portion has wavelengths exceeding a preselected threshold wavelength within the first band;
• transmitting digital telephony signals upstream through the optic fiber with signals being restricted by an upstream digital telephony signal transmitter to a second portion of the first band wherein the second portion has wavelengths less than the preselected threshold wavelength;
• and
• transmitting digital telephony signals downstream through he optic fiber with signals being restricted by a downstream digital telephony signal transmitter to a second band that is entirely separate from the first band.

A method for communicating first and second types of signals over a single silica optic fiber using wave division multiplexing comprising the steps of:

• communicating a first type of signals through the silica optic fiber with the signals being restricted by a first transmitter to a first portion of a first transmission band centered at about 1550 nm wherein the first portion has wavelengths exceeding a preselected threshold wavelength within the first band;
• communicating a second type of signals upstream through the optic fiber with signals being restricted by a second transmitter to a second portion of the first band wherein the second portion has wavelengths less than the preselected threshold wavelength;
• and
• communicating the second type of signals downstream through the optic fiber with signals being restricted by a third transmitter to a second band centered at about 1310 nm that is entirely separate from the first band.