ABSTRACT
We demonstrate a low-loss Ti:LiNbO(3) waveguide circuit for lambda = 1.55 microm that under voltage control can be used to combine two mutually coherent input beams of arbitrary relative amplitude and phase into a single-output waveguide while suffering only propagation losses.
ABSTRACT
We propose and demonstrate a new integrated-optic TE/TM splitter using a polarization-selective Ti:LiNbO(3) directional coupler. By application of appropriate voltages, either polarization can be selected (cross talk will be below -30 dB) or both TE and TM modes can be simultaneously extracted (cross talk will be -24 dB).
ABSTRACT
By careful electrode design we have achieved a 1.7-GHz modulation bandwidth for a Ti:LiNbO(3) integrated-optic TE ? TM mode-converter modulator. Because of the wavelength selectivity of this modulator, it is an attractive device for simultaneously providing multiplexing and signal encoding in future wavelength-multiplexed single-mode light-wave systems.
ABSTRACT
We have achieved complete electro-optic TE <--> TM mode conversion in Ti-diffused lithium niobate waveguides with as little as a 2.5-V drive. Because, for birefringent substrates like lithium niobate, TE <--> TM conversion is wavelength dependent, our method is potentially useful for wavelength multiplexing and demultiplexing. Three independently controlled mode converters, each with a 15-A filter bandwidth and with center wavelengths separated by 80 A, have been fabricated on a single substrate.
