Overlapping multiple fiber Bragg gratings

A semiconductor laser source comprising:

• a package housing;
• a first thermoelectric unit and a second thermoelectric unit mounted to said package housing;
• a laser diode having first and second facets from which output light is emitted, said laser diode mounted to said first thermoelectric unit to maintain said laser diode at a predetermined diode temperature;
• and
• an optical fiber section having a plurality of fiber Bragg gratings, each fiber Bragg grating reflecting light in one of a plurality of wavelengths each with a selected narrow linewidth which is different from another wavelength of light reflected by another one of the fiber Bragg gratings, at least two of said fiber Bragg gratings physically overlapping each other in said optical fiber section, said optical fiber section having an end proximate said second facet to receive emitted light therefrom and to reflect light in each said wavelength with said selected narrow linewidth back into said second facet so that output light is emitted from said first facet in said plurality of wavelengths with said selected narrow linewidths, said optical fiber section mounted to said second thermoelectric unit to maintain said optical fiber section at a predetermined fiber temperature.

A fiberoptic network system comprising:

• a semiconductor laser source having a plurality of fiber Bragg gratings, each fiber Bragg grating reflecting light in one of a plurality of wavelengths each with a selected narrow linewidth, at least two of said fiber Bragg gratings overlapping each other in said optical fiber section, said semiconductor laser source producing output light signals in said plurality of wavelengths with said selected narrow linewidths;
• a modulator receiving radio frequency input signals and coupled to said semiconductor laser source for receiving said output light signals to generate modulated output signals;
• a programmable-dispersion matrix having an input connected to said modulator for receiving said modulated output signals and producing matrix output signals at an output;
• a WDM demultiplexer having an input connected to said output of said programmable-dispersion matrix and a plurality of outputs, said WDM demultiplexer separating said matrix output signals from said input to one of said outputs corresponding to one of said plurality of wavelengths with said selected narrow linewidth;
• and
• a plurality of receivers, each receiver having an input connected to one of said outputs of said WDM demultiplexer to receive said separated signals at one of said plurality of wavelengths with said selected narrow linewidth.