PhD Defense: "Integrated Photonic Comb Generation: Applications in Coherent Communication and Sensing"

John Parker

December 3rd (Monday), 2:15pm
Harold Frank Hall, Room 4164 (ECE Conference Room)

Internet demand continues to increase rapidly due to cloud-computing applications, streaming video and increased mobile access via smart phones. To maintain low costs for access while delivering faster and faster data rates, new integrated photonic devices are needed.

Integrated photonic comb generation operating in the optical C-band can provide many precise frequencies from a single resonator for use in telecommunications and sensing. For coherent communication, one comb can replace 50-100 single frequency lasers in the transmitter and an equal number in a homodyne receiver. Numerous optical sensing applications in manufacturing, 3D mapping, and pressure monitoring in mining and oil wells can also benefit from a compact and precise frequency source that covers a wide bandwidth.

Using gain flattening filters, comb bandwidths are increased to over 2.5 THz. Optical phase-locked loops are closely integrated to provide excellent frequency stability and phase noise reduction. Through phase locking, optical linewidths are reduced from 100 MHz to 275 Hz. The relative frequency error to the optical reference is ~100 Hz over a 240 GHz span. The phase-locked tone has a standard deviation of 20⁰. Theory, design, and testing of these photonic combs are presented, as well as future opportunities for research.

About John Parker:

photo of John Parker John Parker received his B.S. degree in Engineering from Harvey Mudd College, CA in 2007. He received his M.S. degree in Electrical Engineering from the University of California, Santa Barbara in 2009. Since 2007, he has been working towards a Ph.D. degree in the Optoelectronics Technology Center under the supervision of Professor Larry Coldren. His research interests include micro-resonators, mode-locked lasers, and versatile photonic integrated circuits.

Hosted by: Professor Larry Coldren