Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

An apparatus includes a first optical circuit and a second optical circuit. The first optical circuit has a network of interconnected interferometers to perform an M-mode universal transformation on N input optical modes that are divided into (M−1) groups of pulses. The first optical circuit also includes M input ports. Each input port of a first (M−1) input ports is configured to receive a corresponding group of pulses in the (M−1) groups of pulses. The first optical circuit also includes M output ports and a first delay line to couple an Mth output port with an Mth input port. The second optical circuit includes a network of beamsplitters and swap gates to perform a (2M−3)-mode residual transformation. The first optical circuit and the second optical circuit are configured to perform an arbitrary N-mode unitary transformation to the N input optical modes via a rectangular architecture.

Structures for a polarization splitter and methods of fabricating a structure for a polarization splitter. First and second waveguide cores of the polarization splitter are located adjacent to each other in a coupling region. A third waveguide core is located over the second waveguide core in the coupling region. The third waveguide core is composed of a material having a variable refractive index.

Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

An optical transceiver has a first optical waveguide connected to an input/output port for signal light, a second optical waveguide configured to input and output test light, an optical circuit configured to perform optical-to-electrical conversion or electrical-to-optical conversion, and an optical switch provided between the optical circuit and the first and the second optical waveguides and configured to switch between a first path connecting the optical circuit to the first optical waveguide and a second path connecting the optical circuit to the second optical waveguide, wherein the optical switch is configured to select the second path in an ON state with an electrical voltage being applied to the optical switch, and select the first path in an OFF state without the electrical voltage being applied to the optical switch.

An optical device is disclosed, including a phase delay, a first adiabatic coupler adapted to receive an input signal and adapted to be optically coupled to an input of the phase delay, and a second adiabatic coupler adapted to be optically coupled to an output of the phase delay. The second adiabatic coupler includes a first waveguide including a first portion optically coupled to the first output and including a first width, and a second waveguide including a second portion optically coupled to the second output and comprising a second width that is approximately equal to the first width.

A waveguide component includes a waveguide, which is at least partially transparent or translucent with respect to light and is set up in such a way that light can be conducted at least partially through the waveguide. The waveguide includes a waveguide core, a first casing region, and a second casing region. The waveguide core is formed from one or more spatially separated elements of at least one waveguide core material. The first casing region, which includes at least one electro-optical material, interacts with light guided in the waveguide. The first casing region is disposed around the one or more elements of the waveguide core. The second casing region includes at least one dielectric material. The second casing region is arranged around the first casing region and/or the waveguide core. The waveguide component further includes at least two line regions that are at least partially electrically conductive.

Devices, methods for analog-to-digital converters (ADCs) that perform high-dynamic range measurements based on optical techniques are disclosed. In one example aspect, an optical encoder includes a polarization rotator configured to receive a train of optical pulses, and an electro-optic (EO) modulator coupled to an output of the polarization rotator. The EO modulator is configured to receive a radio frequency (RF) signal and to produce a phase modulated signal in accordance with the RF signal. The optical encoder also includes a polarizing beam splitter coupled to the output of the EO modulator; and an optical hybrid configured to receive two optical signals from the polarizing beam splitter and to produce four optical outputs that are each phase shifted with respect to one another.

An integrated compact light engine configured in a on-board in-package optics assembly. The compact light engine includes a single substrate to integrate multiple optical-electrical modules. Each optical-electrical module includes an integrated optical transceiver based on silicon-photonics platform, in which a transmit path configured to output four light signals centered at four CWDM wavelengths and from four laser devices and to modulate the four light signals respectively by four modulators driven by a driver chip and to deliver a multiplexed transmission light. A receive path includes a photodetector to detect four input signals demultiplexed from an incoming light and a trans-impedance amplifier chip to process electrical signals converted from the four input signals detected. A multi-channel light engine is formed by co-integrating or co-mounting a switch device with multiple compact light engines on a common substrate member to provide up to 51.2 Tbit/s total capacity of data communication with median-or-short-reach electrical interconnect.

In an optical switch array on which optical switches that require individual electric wires are integrated, the present invention provides an optical switch array and a multi-cast switch in which the electric wires are shortened by optimizing the arrangement of the optical circuit portion. In the optical switch array in which three arrays of 14 switch circuits are disposed in parallel, the position where each optical switch is disposed is sequentially shifted by Dy in the y axis direction. That is, in the case where an adjacent 14 optical switch circuit exists on both sides, the 14 optical switch located there between is located at the center of the two 14 optical switch circuits, which are adjacent in the y axis direction. Each of the three 14 optical switch circuits that are arrayed are disposed at a position shifted from the adjacent 14 optical switch circuit by Dy in the y axis direction, in accordance with the positional coordinate in the x axis direction, and the electric wires at the ground side are shared such that each optical switch circuit is located sequentially shifted by Dy in the y axis direction.