title: Multistage high-order microring-resonator add-drop filters.
abstract: We propose and demonstrate a multistage design for microphotonic add-drop filters that provides reduced drop-port loss and relaxed tolerances for achieving high in-band extinction. As a result, the first microring-resonator filters with a rectangular notch stopband in the through port (to our knowledge) are shown, with extinctions exceeding 50 dB. Reaching 30 dB beyond previous results, without postfabrication trimming, such extinction levels open the door to microphotonic notch circuits for spectroscopy, wavelength conversion, and quantum cryptography applications. Combined with a low-loss, high-index-contrast electromagnetic design in SiN and frequency-matched microring resonators, this approach led to the first demonstration of flattop microphotonic filters meeting the stringent criteria for high-spectral-efficiency integrated add-drop multiplexers. The 40 GHz wide filters show a 20 nm free spectral range, 2 dB drop loss, and suppression of adjacent channels by over 30 dB.
authors.affiliation: Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. milos@mit.edu
authors.forename: Milos A
authors.initials: MA
authors.lastname: Popovíc
authors.forename: Tymon
authors.initials: T
authors.lastname: Barwicz
authors.forename: Michael R
authors.initials: MR
authors.lastname: Watts
authors.forename: Peter T
authors.initials: PT
authors.lastname: Rakich
authors.forename: Luciano
authors.initials: L
authors.lastname: Socci
authors.forename: Erich P
authors.initials: EP
authors.lastname: Ippen
authors.forename: Franz X
authors.initials: FX
authors.lastname: Kärtner
authors.forename: Henry I
authors.initials: HI
authors.lastname: Smith