Patent ID: 8437637

Claim:
A system for controlling multicast data, comprising: a plurality of transceivers, each of which comprises a laser configured to generate an optical carrier, the generated optical carrier being modulated by electrical downstream point-to-point (p-t-p) data so as to generate optical downstream p-t-p inverse return-to-zero (IRZ) signal; a phase modulator (PM) configured to modulate the generated optical downstream p-t-p IRZ signal by electrical multicast data so as to generate orthogonally modulated signal; and a delay interferometer (DI) configured to demodulate the orthogonally modulated data and having a frequency response peak or dip in response to the demodulating, wherein an offset of a laser center wavelength of the laser from the frequency response peak or dip is adjustable so as to selectively enable or disable the multicast data.