Bulk modulation of multiple wavelengths for generation of CATV optical comb
View Patent ↗A system for generating an optical CATV comb comprising a plurality of wavelength division multiplexed (WDM) optical CATV signals. A set of one or more lasers generate a plurality of narrow-band continuous wave (CW) lights, each CW light having a respective predetermined wavelength and optical power level. An optical MUX couples the plurality of CW lights into a WDM continuous wave light. A broadband optical modulator responsive to a CATV signal modulates the WDM continuous wave light to generate the optical CATV comb.
1. A system for generating an optical cable television (CATV) comb having a plurality of wavelength division multiplexed (WDM) optical signals, the system comprising:
a first number of multi-channel quantum dot lasers for generating a plurality of narrow-band continuous wave (CW) lights, each CW light having a respective predetermined wavelength and optical power level; and
a broadband optical modulator responsive to a second number of (CATV) signals for modulating the plurality of CW lights to generate the optical CATV comb, wherein:
the wavelength of each CW light corresponds to a different CATV channel,
the first number of multi-channel quantum dot lasers is more than one,
the first number of multi-channel quantum dot lasers is less than the second number of CATV signals, and
at least two of the modulated CW lights corresponding to different channels have different optical power levels.
2. The system as claimed in claim 1 , wherein the system further comprises an optical multiplexer (MUX) for coupling the plurality of CW lights into a WDM continuous wave light, the broadband optical modulator modulating the WDM continuous wave light to generate the optical CATV comb.
3. A system for generating an optical cable television (CATV) comb having a plurality of wavelength division multiplexed (WDM) optical signals, the system comprising:
a single multi-channel quantum dot laser configured to generate a plurality of continuous wave (CW) lights, each of the CW lights corresponding to a different wavelength and each wavelength corresponding to a respective one of a plurality of CATV channels; and
a modulator coupled to modulate the plurality of CW lights output from the single multi-channel quantum dot laser, wherein:
the modulator modulates the CW lights with different data signals,
the single multi-channel quantum dot laser is the only laser that generates the CW lights for the CATV channels within at least a predetermined channel plan, and
the modulated CW lights are formed into a WDM continuous wave light without use of a multiplexer.
4. The system as claimed in claim 3 , wherein the single multi-channel quantum dot laser is the only laser that generates the CW lights for all the CATV channels output from a cable television system.
5. The system as claimed in claim 1 , wherein a number of the CW lights is based on a channel plan of a CATV network corresponding to the CATV channels.
6. The system as claimed in claim 5 , wherein a spectral distribution of the CW lights is based on the channel plan of the CATV network corresponding to the CATV channels.