In various embodiments, a beam-parameter adjustment system and focusing system alters a spatial power distribution of a radiation beams before the beam is coupled into an optical fiber or delivered to a workpiece.

An optical isolator has optical fibers arranged on a single side. The optical isolator includes an input optical fiber, an output optical fiber, an input splitting/combining device, an output splitting/combining device, an input optical rotation device, an output optical rotation device, a lens, a Faraday rotator, and a reflector. The input optical fiber and the output optical fiber are on a same side of each of the lens, the Faraday rotator, and the reflector. The optical isolator with input and output optical fibers arranged on a single side only needs to use one lens. The input and output splitting/combining devices are fixed on an end surfaces of input/output optical fibers, respectively.

In various embodiments, a beam-parameter adjustment system and focusing system alters a spatial power distribution of a radiation beam, via thermo-optic effects, before the beam is coupled into an optical fiber or delivered to a workpiece.

An integrated receiver chip comprising: a first end and a second end; at least one optical input port disposed at the first end; a polarization manipulation device optically connected to one of the at least one optical input port, the polarization manipulation device being adapted to split an optical signal into a first and a second optical signals; a first and a second dispersion compensators each optically connected to the polarization manipulation device, the first and the second dispersion compensators each being adapted to selectively induce a dispersion on an optical signal propagating through the dispersion compensator; and a first and a second photodetectors optically connected to the first and the second dispersion compensators, respectively.

An optical modulator carrier assembly includes a optical modulator, a transmission line substrate, a first via, a second via and a wire having an inductor component provided on a second surface of the transmission line substrate, and electrically connecting between the another end of the first via and the another end of the second via. The one end of the first via, the cathode electrode pad, the terminating resistor, the one end of the second via are arranged on the in this order.

A polarization scrambler using a retardance element (RE) is disclosed. The polarization scrambler may include an optical fiber input to transmit an optical signal, and a beam expander to receive and expand the optical signal to create an expanded optical signal. The polarization scrambler may include a retardance element (RE) to cause a polarization scrambling effect on the expanded optical signal and to create a scrambled expanded optical signal. The polarization scrambler may include a beam reducer to receive and reduce the scrambled expanded optical signal to create a scrambled optical signal. The polarization to scrambler may include an optical fiber output to receive scrambled optical signal. The optical fiber output may transmit the scrambled optical signal to one or more downstream optical components.

An optical coupling device can include a first birefringent layer having opposing first and second surfaces. The first birefringent layer can split incident light received at the first surface into first and second beams. The first and second beams can have respective polarization orientations that are orthogonal to each other. The first birefringent layer can propagate the first and second beams along respective first and second paths within the first birefringent layer to the second surface. The first and second beams can be spatially separated at the second surface. A redirection layer facing the second surface of the first birefringent layer can include first and second grating couplers configured to respectively redirect the first and second beams to propagate within the redirection layer as respective third and fourth beams. In some examples, the third and fourth beams can have respective polarization orientations that are parallel to each other.

A flexible substrate includes: an insulating base member; a plurality of lands formed aligned in a plurality of lines in a first direction on the base member; and a plurality of wirings formed on the base member, extending in a second direction intersecting the first direction, and connected to the plurality of lands on each line of the plurality of lines, wherein the plurality of wirings include a wiring extending between the lands aligned in the first direction, and wherein each of the plurality of lands has a planar shape longer in the second direction.

Provided is a polarization-combining module in which it is possible to suppress deviation of an optical axis in a polarization-combining optical system and to perform efficient polarization combination with a less optical loss.

A polarization-combining module includes: a PBS 4 which combines two linearly polarized lights input and emits the combined light; a λ/2 wavelength plate 3 which is provided on an optical path of at least one of the two linearly polarized lights which are input to the PBS 4, and provides polarization rotation by a predetermined angle to the linearly polarized light that passes therethrough; and a pedestal member 10 on which the λ/2 wavelength plate 3 and the PBS 4 are mounted, in which the pedestal member 10 has a protrusion part 12 which defines mounting positions of the λ/2 wavelength plate 3 and the PBS 4 so as to be separated from each other and be parallel to each other, and the λ/2 wavelength plate 3 and the PBS 4 are mounted on the pedestal member 10 with apart of each of the λ/2 wavelength plate 3 and the PBS 4 being brought into contact with the protrusion part 12.

Devices and systems to perform optical alignment by using one or more liquid crystal layers to actively steer a light beam from an optical fiber to an optical waveguide integrated on a chip. An on-chip feedback mechanism can steer the beam between the fiber and a grating based waveguide to minimize the insertion loss of the system.