On-chip programmable ultra-wideband microwave photonic phase shifter and true time delay unit
Publication Type:Journal Article
Source:Optics Letters, OSA, Volume 39, Number 21, p.6181--6184 (2014)
Keywords:Phase shift; Continuous optical signal processing ; Integrated optics devices; Bragg reflectors; Microwaves
We proposed and experimentally demonstrated an ultra-broadband on-chip microwave photonic processor that can operate both as RF phase shifter (PS) and true-time-delay (TTD) line, with continuous tuning. The processor is based on a silicon dual-phase-shifted waveguide Bragg grating (DPS-WBG) realized with a CMOS compatible process. We experimentally demonstrated the generation of delay up to 19.4\&\#xA0;ps over 10\&\#xA0;GHz instantaneous bandwidth and a phase shift of approximately 160\&\#xB0; over the bandwidth 22\&\#x2013;29\&\#xA0;GHz. The available RF measurement setup ultimately limits the phase shifting demonstration as the device is capable of providing up to 300\&\#xB0; phase shift for RF frequencies over a record bandwidth approaching 1\&\#xA0;THz.