"Slab-Coupled Optical Waveguide Devices and their Applications"

Dr. Paul Juodawlkis, Assistant Leader, Electro-Optic Materials & Devices Group, MIT Lincoln Laboratory

July 24th (Wednesday), 2:00pm
Engineering Science Building (ESB), Room 2001

photo of paul juodawlkis
For the past decade, MIT Lincoln Laboratory has been developing new classes of high-power semiconductor optoelectronic emitters and detectors based on the slab-coupled optical waveguide (SCOW) concept. The key characteristics of the SCOW design include (1) the use of a planar slab waveguide to filter the higher-order transverse modes from a large rib waveguide, (2) low overlap between the optical mode and the active layers, and (3) low excess optical loss. These characteristics enable waveguide devices having large (> 5 × 5 μm) symmetric fundamental-mode operation and long length (~1 cm). These large dimensions, relative to conventional waveguide devices, allow efficient coupling to optical fibers and external optical cavities, and provide reduced electrical and thermal resistances for improved heat dissipation.

This seminar will review the SCOW operating principles and describe applications of the SCOW technology, including Watt-class semiconductor SCOW lasers (SCOWLs) and amplifiers (SCOWAs), monolithic and ring-cavity mode-locked lasers, single-frequency external cavity lasers, and high-current waveguide photodiodes. The SCOW concept has been demonstrated in a variety of material systems at wavelengths including 915, 960–980, 1040, 1300, 1550, and 2100 nm. In addition to single emitters, higher brightness has been obtained by combining arrays of SCOWLs and SCOWAs using wavelength beam-combining and coherent combining techniques. These beam-combined SCOW architectures offer the potential of kilowatt-class, high-efficiency, electrically pumped optical sources.

About Dr. Paul Juodawlkis:

Dr. Paul W. Juodawlkis is the Assistant Leader of the Electro-Optic Materials and Devices Group at MIT Lincoln Laboratory where he is leading research on semiconductor optoelectronic devices, integrated photonics, and microwave photonics. His research efforts have focused on the development of optical sampling techniques for photonic analog-to-digital converters (ADCs), quantum-well electrorefractive modulators, high-power waveguide photodiodes, and high-power semiconductor optical amplifiers (SOAs) and their application in mode-locked lasers and narrow-linewidth external-cavity lasers. Dr. Juodawlkis received the B.S. degree from Michigan Technological University, Houghton, the M.S. degree from Purdue University, West Lafayette, IN, and the Ph.D. degree from the Georgia Institute of Technology, Atlanta, all in electrical engineering. Prior to his research and leadership activities in the Electro-Optic Materials and Devices Group (1999-present), he served as a radar systems engineer on a multi-sensor airborne testbed program at the Lincoln Laboratory (1988-1993), and as a member of the Ultrafast Optical Communications Laboratory (UFOCL) at Georgia Tech (1993-1999) where he investigated the ultrafast optical nonlinearities of low-temperature grown quantum-well materials and optical packet-switch architectures.

Dr. Juodawlkis is a Fellow of the Optical Society (OSA) and a Senior Member of the IEEE. He has authored or co-authored over 100 peer-reviewed journal and conference publications. He was General Co-Chair of the 2012 Conference on Lasers and Electro-Optics (CLEO) and Program Co-Chair of the 2010 CLEO. He is currently an elected member of the IEEE Photonics Society Board of Governors (2011-2013). He has served as Chair of the IEEE Photonics Society Technical Committee on Microwave Photonics (2003-2006), Program Co-Chair of the 2003 Photonics Society Summer Topical Meeting on Photonic Time/Frequency Measurement and Control, and committee member of the International Topical Meeting on Microwave Photonics (2004, 2008, 2013). He is also a Technical Steering Committee member of the Boston Chapter of the IEEE Photonics Society (2004-present).

Hosted by: Professor Larry Coldren