Self-ILPLL Using Optical Feedback for Phase Noise Reduction in Microwave Oscillators Zhang, Li ; Poddar, Ajay K. ; Rohde, Ulrich L. ; Daryoush, Afshin S. Abstract Publication: IEEE Photonics Technology Letters Pub Date: March 2015 DOI: 10.1109/LPT.2014.2386868 Bibcode: 2015IPTL...27..624Z