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Conference 12440 > Paper 12440-11
Paper 12440-11

Novel >57GHz bandwidth O-band InGaAlAs MQW RW Dual DFB

31 January 2023 • 11:30 AM - 11:50 AM PST | Moscone Center, Room 157 (Upper Mezzanine South)


We present a novel Dual DFB laser for high-speed direct modulation. The design comprises two identical quarter-wavelength shifted DFBs in mirrored configuration separated by a passive waveguide. While operating one DFB laser under current modulation, the other DFB is unbiased and acts as a DBR reflector providing passive optical feedback. This structure utilizes the effect of photon-photon resonance to increase the modulation bandwidth of 57.6 GHz. Operation of these devices under large signal modulation at 56 Gbps and 72 Gbps is demonstrated.


Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)
Gayatri Vasudevan Rajeswari received the B.Tech in Electronics and Communication from University of Kerala, India in 2017 and the M.S. degree in Electrical Engineering specializing in Micro and Nanoelectronics from RWTH Aachen, Germany in 2021. In 2021, she joined Fraunhofer HHI, where her main focus is on the research and development of high speed directly modulated lasers for optical telecommunication.
Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI (Germany)