Semiconductor laser with low relative intensity noise of individual longitudinal modes and optical transmission system incorporating the laser

An optical transmission system comprising:

• a) a semiconductor laser comprising:
• i) an optical resonator comprising:
• A) a first mirror;
• B) a second mirror;
• C) an active section;
• and
• D) at least one noise reducing section;
• and
• ii) a quantum dot active region comprising a quantum dot array;
• wherein the active section and the noise reducing section are disposed between the first mirror and the second mirror and are fabricated as a monolithically integrated structure;
• wherein the active section and the noise reducing section are electrically isolated from each other;
• wherein the laser is configured to produce an output lasing spectrum using an inhomogeneously broadened ground state transition of the quantum dot array;
• wherein the laser emits a plurality of optical modes such that a total relative intensity noise of each optical mode is less than 0.2% in the 0.001 GHz to 10 GHz range;
• and
• wherein the plurality of optical modes serve as a plurality of optical information signals;
• b) a transmitter that provides modulation to each optical signal independently;
• and
• c) a receiver that provides detection to each optical signal independently.