Laser and laser signal combiner
View Patent ↗An optical communication system for transmitting multiple optical beams, each at a different wavelength is disclosed. The optical communication system includes a laser array having multiple laser transmitters transmitting multiple optical beams, each at a different wavelength. The optical communication system further includes a diffraction grating optically coupled to the laser array, the diffraction grating diffracting each of the optical beams at a substantially equal diffraction angle to form a combined optical beam. The combined beam is then focused into an optical communication media.
1. An optical communication system comprising:
a laser array having a plurality of laser transmitters transmitting a plurality of optical beams at a plurality of different wavelengths;
a virtual image phased array optically coupled to said laser array, each of the plurality of optical beams incident on the virtual image phased array at a corresponding angle of incidence, wherein the ratio of the difference in the angle of incidence between optical beams and the difference in wavelength between optical beams is approximately equal to the angular dispersion of the virtual image phased array, whereby the virtual image phased array combines the plurality of optical beams into a combined optical beam; and
an optical communication media optically coupled to the virtual image phased array, the optical communication media receiving the combined optical beam.
2. The optical communication system of claim 1 wherein each of the plurality of optical beams transmitted by the laser array is incident upon the virtual image phased array at a different angle of incidence.
3. The optical communication system of claim 2 wherein the angle of incidence on the virtual image phased array for each of the plurality of optical beams transmitted by the laser array varies in accordance with separation between adjacent laser transmitters.
4. The optical communication system of claim 1 further comprising a collimating lens optically coupled between the laser array and virtual image phased array, wherein the collimating lens collimates the optical beams, with the collimated optical beams incident on the virtual image phased array.
5. The optical communication system of claim 4 further comprising a cylindrical lens optically coupled to the virtual image phased array, wherein the cylindrical lens receives the combined optical beam and passes the combined optical beam to a focusing lens that focuses the combined optical beam into the optical communication media.
6. The optical communication system of claim 1 further comprising a receiver coupled to the optical communication media.
7. The optical communication system of claim 1 further comprising one or more electro-absorption modulators monolithically integrated with one or more of the plurality of laser transmitters in the laser array, wherein the electro-absorption modulators modulate the optical beam of a corresponding laser transmitter in accordance with an information signal.
8. The communication system of claim 7 wherein the virtual image phased array comprises a plate formed from optically transparent material having a first reflective coating formed on a first portion of a first side of the plate and a second reflective coating formed on a first portion of a second side of a plate and a low reflectivity region for receiving the transmit optical beams.