Abstract: Optical apparatus for selectively coupling optical wavelength components of wavelength multiplexed optical signals from an input port to an output port includes an interferometer coupled to the input and output port. The interferometer includes a first optical path and a second optical path. A plurality of optical phase modulators is arranged in said first path to include one optical phase modulator for each wavelength component. Each wavelength component is split into a wavelength component first portion on the first optical path and a wavelength component second portion on the second optical path. Each optical phase modulator is selectively operable to phase shift the corresponding one wavelength component first potion by first or second predetermined phase shifts, whereby the wavelength component is or is not coupled from the input port to the output port.

Abstract: Optical switching apparatus includes a circulator coupling an input port, an output port and a Sagnac interferometer. The Sagnac interferometer includes a plurality of phase modulators coupled into the Sagnac loop. Each phase modulator operates on one wavelength component of wavelength division multiplexed signals to determine whether the corresponding wavelength component is coupled from the input port to the output port.

Abstract: Optical switching apparatus includes a Mach-Zehnder interferometer. The Mach-Zehnder interferometer includes first and second optical signal ports coupled to first and second optical paths by a coupler. The coupler splits optical signals received at the first and said second optical signal ports into first optical signals propagating on the first optical path and second optical signals propagating on the second optical path. The optical signals comprise a plurality of wavelength components. The first path includes a plurality of phase modulators. Each phase modulators is operable to receive one wavelength component and selectively provides phase modulation to the one wavelength component such that wavelength components of wavelength division multiplexed signals are coupled on a selected wavelength by wavelength component basis from the first port to the second port.

Abstract: A Sagnac interferometer includes an optical signal port receiving optical signals comprising multiplexed wavelength components. A coupler splits each wavelength component into first and second portions that are coupled to an optical loop in counter-propagating directions. A plurality of phase modulators is disposed in the loop. Each phase modulator operates on wavelength component portions at one wavelength of a plurality of predetermined wavelengths.

Abstract: Optical switching apparatus includes a Mach-Zehnder interferometer. The Mach-Zehnder interferometer includes first and second optical signal ports coupled to first and second optical paths by a coupler. The first path includes a plurality of phase modulators to selectively provide phase shifts on a wavelength component basis. The phase modulators are use to selectively couple optical signals from the input port and add port to the output port on a wavelength component by wavelength component basis.

Abstract: A non-reciprocal phase shifter utilizes first and second Faraday crystals. A permanent magnet is disposed proximate the first Faraday crystal and a changeable magnetic source is disposed proximate the second Faraday crystal.

Abstract: An optical add/drop utilizes an interferometer having a plurality of phase modulators in one of two optical paths. Each phase modulator is selectively operable on wavelength components at a corresponding one wavelength of a plurality of predetermined wavelengths. Each phase modulator selectively provides a first or a second phase shift to such wavelength components to produce corresponding first or second phase shift differentials between corresponding wavelength components propagating on the two optical paths. The interferometer produces corresponding first or second interference results on a wavelength component by wavelength component basis. The first interference result causes the wavelength component of a first optical signal at a first input port to be coupled to a first output port.

Abstract: The invention is a non-reciprocal phase shifter that operates on optical signals. A Faraday rotator crystal is utilized in conjunction with a magnetic field source to produce non-reciprocal phase shifts in optical signals traversing the crystal in opposite directions.

Abstract: Apparatus for selectively coupling wavelength components of first optical signals comprising a plurality of multiplexed first wavelength components and multiplexed wavelength components of second optical signals comprising second wavelength components to a common output on a wavelength component by wavelength component basis utilizes and interferometer. The interferometer has first and second optical paths. A plurality of phase modulators in the first path is used to select wavelength components of the first or second optical signals to be coupled to the common output.

Abstract: Optical add/drop apparatus is provided for coupling wavelength components of wavelength division multiplexed signals from an input port to an output port and for coupling one or more add wavelength components into the wavelength division multiplexed signals at the output port while coupling the corresponding wavelength component of said signals at said input port to a drop port. A Michelson interferometer that includes a plurality of phase modulators in one of its two optical paths is used to selectively couple wavelength components from either the input port or from the add port to the output port, and for coupling wavelength components from the input port to a drop port when wavelength components from said add port are coupled to the output port.

Abstract: Optical switching apparatus for switching optical signals comprising multiplexed wavelength components, on a wavelength-by-wavelength component basis utilizes a Mach-Zehnder interferometer. The Mach-Zehnder interferometer includes a plurality of phase modulators in one of its paths. Each phase modulators is operable to receive wavelength components and add wavelength components at one wavelength and selectively provides phase modulation to the wavelength components to selectively couple the wavelength components and add wavelength components on a selected wavelength by wavelength component basis from a first port to a second port.

Abstract: A Michelson interferometer includes first and second optical paths. One path includes a plurality of phase modulators. Each phase modulator is selectively operable on wavelength components of optical signals that are at a predetermined one wavelength of a plurality of predetermined wavelengths.

Abstract: Optical add/drop apparatus is provided for coupling wavelength components of wavelength division multiplexed signals from an input port to an output port and for coupling one or more wavelength components at an add port into the wavelength division multiplexed signals at the output port while coupling the corresponding wavelength component of said signals at said input port to a drop port. A Sagnac interferometer that includes a plurality of phase modulators in one of its two optical paths is used to selectively couple wavelength components from either the input port or from the add port to the output port, and for coupling wavelength components from the input port to a drop port.

Abstract: Optical signals comprising a plurality of wavelength components at predetermined wavelengths selected from a plurality of predetermined wavelengths are switched on a wavelength component by wavelength component basis utilizing a Michelson interferometer. The Michelson interferometer includes a plurality of phase modulators in one arm. Each phase modulator is selectively operable on wavelength components at one predetermined wavelength to phase modulate the wavelength components. The phase modulation determines whether or not the wavelength components of the optical signals at an input port are coupled to an output port.

Abstract: Optical apparatus is provided for coupling wavelength components of wavelength division multiplexed signals from an input port to an output port and for coupling one or more wavelength components at an add port into the wavelength division multiplexed signals at the output port. A Michelson interferometer that includes a plurality of phase modulators in one of its two optical paths is used to selectively couple wavelength components from the input port or from the add port to the output port.

Abstract: An integrated optic device includes at least one waveguide formed in a surfaced thereof. The waveguide is formed utilizing a two-step proton exchange process in which the substrate is bathed in a strong acid and then subjected to a plurality of annealing cycles.

Abstract: A method of manufacturing an integrated optic device having at least one waveguide formed in a surfaced thereof is described. The waveguide is formed utilizing a two-step proton exchange process in which the substrate is bathed in a strong acid and then subjected to a plurality of annealing cycles.

Abstract: The invention is a tunable optical transmitter and light source in which a gain media is connected in an optical loop or resonator and a tunable filter is inserted in to the loop. A sensor is coupled to the loop and provides wavelength indicative signals that a processing unit utilizes in accordance with a predetermined algorithm to determine the wavelength of optical signals in the loop. The processing unit adjusts the tunable filter to a wavelength selected from a plurality of predetermined wavelengths.

Abstract: A tuner for optical signals comprises a surface acousto-optic tunable filter utilized to provide signals indicative of the wavelength of the optical signals, a tunable filter, and a processor responsive to the wavelength indicating signals to control the tunable filter such that the tunable filter passes only optical signals at a predetermined wavelength.

Abstract: An integrated optic device for optical signals comprises substrate carrying a surface acousto-optic tunable filter utilized to provide signals indicative of the wavelength of the optical signals, and a tunable filter controllable via a processor such that the tunable filter passes only optical signals at a predetermined wavelength.