We highlight the importance of the delay arising from optical filters in slow-light-based microwave phase shifting systems. We calculate the filter delay numerically from the measured amplitude response by using the well-known Kramers–Kronig relations. The complex filter transmission response is then incorporated within a numerical model with which we explain phase shifting results obtained from experiments employing semiconductor optical amplifiers as slow light elements.
© 2010 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: April 12, 2010
Manuscript Accepted: May 14, 2010
Published: June 29, 2010
Seán Ó Dúill, Evgeny Shumakher, and Gadi Eisenstein, "The role of optical filtering in microwave phase shifting," Opt. Lett. 35, 2278-2280 (2010)