According to an example, a polarization control system is to manipulate polarization manipulators to output light that achieves a trajectory on a Poincaré sphere that tracks a known trajectory of a polarizer on the Poincaré sphere, in which the trajectory of the output light enables definition of a reference polarization state of the output light. The polarization control system may also manipulate an output polarization manipulator to set the output light to a predefined polarization state based upon the reference polarization state.

A wavelength selective optical switch includes a light input/output unit having a plurality of input/output ports, a polarization plane-independent wavelength dispersion element that splits incident light input from the optical input/output unit into spatially different angles for each wavelength, and synthesizes emergent light from different directions and outputs the light to the optical input/output unit, a condenser element that condenses the light split by the wavelength splitting element, a polarization splitter that splits incident light incident via the condenser element according to a polarization component to result in first and second light beams, aligns a polarization direction by rotating a polarization direction of one of the beams, and synthesizes the incident light by rotating one polarization direction of the emergent light of the same wavelength among the first and second reflected light beams, and a space phase modulation element.

An optical multiplexer and methods of making and calibrating the same are disclosed. A method of aligning components in a multichannel optical/optoelectronic transmitter includes passively fixing a plurality of light emitters in place on a substrate; adjusting positions of a first lens passing light from a first light emitter and an optical signal transmission medium receiving the light from the first light emitter until a far field spot of the light from the first light emitter is at or near an end of the transmission medium; fixing one or more optical subassemblies on the substrate; and adjusting positions of the optical subassembly(ies) to align light from the remaining light emitters with the far field spot. Some embodiments include multiple optical subassemblies, each including a lens and a filter. Other embodiments include one optical subassembly including a mirror and a beam combiner.

Photonic rotators integrated on a substrate are disclosed for manipulating light polarization.

An optical system capable of routing primary and secondary high power lasers through a blocking switch is described.

An optical apparatus for compensating a measurement inaccuracy of polarization dependent loss (PDL) is described. The apparatus comprises a first polarization rotator splitter (PRS) for splitting an input beam into orthogonally polarized X and Y component beams and rotating one of the X and Y component beams to be in the same polarization as the other component beam; first and second circuits for processing the X and Y component beams respectively; a first polarization rotator combiner (PRC) for combining the X and Y component beams processed respectively by the first and second circuits into an output beam, one of the X and Y component beams being rotated to be orthogonally polarized with respect to the other component beam. The apparatus further comprises a first set of photodetectors for monitoring a first relative power between the X and Y component beams before the first and second circuits; a second set of photodetectors for monitoring a second relative power between the X and Y component beams processed respectively by the first and second circuits; and complementary PRSs and PRCs coupled between the first and second circuits and the second set of photo-detectors for compensating a measurement inaccuracy of PDL caused by the first PRS and PRC.

The present transmitter optical module provides an LD 11, a first lens 12 with a focal point aligned with an optical output point of the LD 11, a second lens 14 that generates an optical output of the first lens 12 as a concentrated optical signal, and a third lens 4 that provides an optical output of the second lens 14 in an optical fiber 5. The second lens 14 is set at a position offset toward the third lens 4 from a position at which the second lens 14 outputs a collimated optical signal. The third lens 4 concentrates an optical output thereof within the optical fiber 5.

The present transmitter optical module provides an LD 11, a first lens 12 with a focal point aligned with an optical output point of the LD 11, a second lens 14 that generates an optical output of the first lens 12 as a concentrated optical signal, and a third lens 4 that provides an optical output of the second lens 14 in an optical fiber 5. The second lens 14 is set at a position offset toward the third lens 4 from a position at which the second lens 14 outputs a collimated optical signal. The third lens 4 concentrates an optical output thereof within the optical fiber 5.

Embodiments herein relate to photonic integrated circuits with an on-chip optical isolator. A photonic transmitter chip may include a laser and an on-chip isolator optically coupled with the laser that includes an optical waveguide having a section coupled with a magneto-optic liquid phase epitaxy grown garnet film. In some embodiments, a cladding may be coupled with the garnet film, the on-chip isolator may be arranged in a Mach-Zehnder interferometer configuration, the waveguide may include one or more polarization rotators, and/or the garnet film may be formed of a material from a rare-earth garnet family. Other embodiments may be described and/or claimed.

A method and device for emitting electromagnetic radiation at high power using nonpolar or semipolar gallium containing substrates such as GaN, AlN, InN, InGaN, AlGaN, and AlInGaN, is provided. In various embodiments, the laser device includes plural laser emitters emitting green or blue laser light, integrated a substrate.