Birefringent Gires-Tournois interferometer (BGTI) for DWDM interleaving

Summary form only given. The BGTI interleaver provides wide and flat passbands, high isolation, low insertion loss, and stable operation for DWDM interleaving. The transmission characteristic is created by the nonlinear phase response of G-T cavities. The low insertion loss arises from the use of large diameter collimated beams and high quality micro-optic components. The stable operation over temperature and wavelength is derived from the use of air gap cavities.