Abstract: The present invention is directed toward an edge detecting photodiode that includes a waveguide comprising a p-doped InP cladding layer, an n-doped InP cladding layer, a p-side waveguide layer, an n-side waveguide layer, and an InGaAs absorption layer therebetween, in which the absorption layer is doped to have an absorption region and a depletion region that, when under bias, will overlap by an amount sufficient to substantially balance the transit time of positive and negative charged carriers across the waveguide. The photodiode is preferably formed on an InP substrate. The photodiode preferably has a planar polymer layer in contact with the InP substrate. The polymer layer also preferably has a ridge formed therein for the photodiode waveguide. The polymer layer may have a coplanar transmission line deposited thereon, and a pair of metal-insulator-metal (“MIM”) capacitors may be incorporated into the coplanar transmission line.

Abstract: An optical device for coupling an optical signal to an optical detector is disclosed. The optical device includes a mode compression section disposed between an optical input source and a photodetector, which enables efficient coupling between the optical input source and the photodetector.

Abstract: In accordance with the invention, an integrated dual wavelength transceiver comprises a multilayer monolithic structure that functions as an optical waveguide, a photodetector, and a light emitter. In an alternative embodiment, second spaced apart portion on the same substrate can provide an amplifier to amplify electrical signals generated by the photodetector.

Abstract: The specification describes lightwave systems with remotely powered photoelectric generators. Optical power transmitted through the fiber is incident on a remotely located photodiode array. High power conversion efficiency coupled with a specially designed diode array generates sufficient power to operate electromechanical or electrooptic apparatus in the remote station. Long wavelength photodiodes are serially connected to increase the voltage to practical operating levels. In a communication system, with an optical signal transmitted with the optical power, multiplexers are used for separating the optical power from the optical signal.

Abstract: The specification describes a discriminating photodiode for detection of 1.55 .mu.m signals used in wavelength multiplexed systems operating with 1.3 .mu.m and 1.55 .mu.m wavelengths. The device uses a semiconductor layered structure to absorb photons from the 1.3 .mu.m signal, and annihilate the photogenerated carriers, while passing the 1.55 .mu.m light to a photodetecting junction beneath the layered structure.

Abstract: The specification describes lightwave systems with remotely powered photoelectric generators. Optical power transmitted through the fiber is incident on a remotely located photodiode array. High power conversion efficiency coupled with a specially designed diode array generates sufficient power to operate electromechanical or electrooptic apparatus in the remote station. Long wavelength photodiodes are serially connected to increase the voltage to practical operating levels. In a communication system, with an optical signal transmitted with the optical power, multiplexers are used for separating the optical power from the optical signal. Also disclosed are optimally designed photodetector arrays in which the photodetector elements are segments of a circular or polygonal circularly symmetric array to increase the fill factor of the array.

Abstract: The lateral base resistance of a DHBT device is reduced and its high-speed operating characteristics thereby improved by forming a structure that initially includes a relatively thick extrinsic base layer overlying a relatively thin intrinsic base layer. The extrinsic base layer is then etched to form a window in which an emitter layer is deposited. In that way, the growth time for formation of the base-emitter junction is minimized. High-performance devices are thereby realized in a relatively simple process that has advantageous self-alignment features.