Search

A monolithic dual‐polarisation quadrature phase shift keying transmitter is demonstrated for operation at 2.25 Tbit/s over 40 wavelengths and 1 THz of spectral bandwidth. The single‐chip InP‐based transmitter employs 40 tunable distributed feedback lasers, 80 nested Mach‐Zehnder modulators and other elements to provide more than 1700 integrated photonic functions. [ABSTRACT FROM AUTHOR]

Recently proposed tapered MMI devices have been shown to allow for substantial reductions in device geometries, but as of this time such ultracompact devices have not been realized. The fabrication and testing of a series of parabolically tapered 3-dB 2×2 MMI devices have been accomplished in the InP-InGaAsP double heterostructure system. The results validate previous predictions and yield device geometries about 40% smaller than the shortest previous 3-dB 2×2 MMI device. The measured splitting ratios of these devices are compared to the results of numerous beam propagation method simulations, based on the finite-difference method, and good correlation is obtained [ABSTRACT FROM PUBLISHER]