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Optical Communications

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The goal of this proposed project is to develop a revolutionary semiconductor laser transmitter technology, based on the homogeneous integration of photonics and electronics. The new device, a TX-VCSEL, is the integration of a high frequency Heterojunction Bipolar Transistor (HBT) with a Vertical Cavity Surface Emitting Laser (VCSEL).
Mirco-ring lasers (MRLs) are compact semiconductor lasers, where the output light is coupled directly into a planar waveguide, making them suitable for monolithic integration with other optical components, and promising for optical communications and optical interconnects. We are integrating a heterojunction bipolar transistor (HBT) structure into the MRL, and designing for very high frequency modulation modulation (>40 GHz).
Optical injection locking uses a second (master) laser to inject photons at a similar wavelength into the transmitter laser (termed follower or slave). Under certain conditions, the follower laser is locked in phase to the master, and the laser dynamics fundamentally change and can result in far better device performance.