Finisar Sweden Ab

Syntune Ab

Jan-Olof Wesstrom

Dave Adams

Per O Granestrand

Urban Eriksson

Edgard Goobar

Christopher Daunt

Pierre-Jean Rigole

Stefan Hammerfeldt

Peter Szabo

A waveguide for the extraction of light at low levels of reflection arranged to guide light from an electro-optical component on a chip to a facet on the chip for extraction includes a first part and a second part. The first part () is extended, the second part () includes a surface (JK) through which the light exits from the waveguide (). A non-adiabatic longitudinal section (GHLM) is located after the first part () but before the surface (JK) in the direction of propagation of the light, and the surface (JK) forms in the plane of the chip a first angle (V) with the optical axis (A) of the first part () that lies between 5 and 80 degrees.

Waveguide for extraction of light at low levels of reflection

One or more input access waveguides are connected to an optical splitter arranged to divide the light into two or more output waveguides, at least two of the splitter's output access waveguides are used to form a Mach-Zehnder interferometer modulator where at least one arm of the interferometer has a phase modulator electrode and a single electrical contact is arranged to apply a common voltage simultaneously to a selected portion in each arm, or selected portions in each arm of the waveguides that are disposed after the splitter but preceding the phase modulation electrodes, or alternatively the single electrical contact is arranged to apply the voltage to a selected portion of the input access waveguide connected to the splitter and in one or more selected portions of one or both of the arms after the splitter but preceding the phase modulation electrodes to provide gain or reduced optical loss.

Semiconductor optical amplifier

Method for modulating a carrier light wave to achieve, a modulated light wave which carries information by symbols selected from a set of at least two different symbols. The light led through each path is phase-shifted by a respective total variable part phase shift, which for each path is the sum of at least three respective variable part phase shifts. Each variable part phase shift for each modulation state assumes one of two respective predetermined values, and each symbol is modulated using a respective combination of two such total variable part phase shifts. The modulation performed by the two paths is a PSK (Phase Shift Keying) modulation scheme, the group of symbols includes 2unique symbols, the light led through each respective path is phase shifted using 2&#x2212;1 variable part phase shifts, and the respective difference between the respective predetermined values is the same for all variable part phase shifts.

Method for modulating a carrier light wave

Method for modulating a carrier light wave with symbols, led through a modulating interferometer, the total path phase shift being the sum of a respective first, second, third or fourth static phase shift and a respective first, second, third or fourth variable modulating phase shift amount. For each of at least two symbols: the first variable modulating phase shift equals the sum of the first pair phase shift and the common phase shift; the second variable modulating phase shift equals the sum of the negative of the first pair phase shift and the common phase shift; the third variable modulating phase shift equals the sum of the second pair phase shift and the negative of the common phase shift; the fourth variable modulating phase shift equals the sum of the negative of the second pair phase shift and the negative of the common phase shift.

Method for modifying the splitting or combining ratio of a first multimode interference (MMI) coupler (), which first coupler is arranged to convey light from one or several input waveguides to one or several output waveguides, wherein a film () of a material is arranged over the first coupler, wherein the film is strained so that a force is applied by the film to the surface of the first coupler, and so that the refractive index profile in the material of the first coupler changes as a consequence of the force, and wherein the splitting or combining ratio is modified as a consequence of the changed refractive index profile.

Method for modifying the combining or splitting ratio of a multimode interference coupler

A laser device () includes a laser () in turn including at least one Distributed Bragg Reflector (DBR) section (), at least one phase section () and at least one gain section (), further including a laser control element (), a feedback control element () and a frequency noise discriminator (), which feedback control element is arranged to feed a variable feedback signal to at least one of the at least one DBR section and the at least one phase section of the laser, so that the output laser frequency is altered in response to a variation in the feedback signal or the combination of respective feedback signals, whereby the feedback signal or combination of respective feedback signals is varied as a function of the detected frequency fluctuation so as to counteract the detected frequency fluctuation.

Semiconductor laser device

An optical light splitter includes or is connected to at least two input waveguides () for light. The light splitter (), on the side opposite to the input waveguide or input waveguides () transitions into at most one output waveguide () in the direction of propagation of the incoming light. A surface () is present set at an angle to the direction of propagation of the light in that part of the light splitter that is opposite to the input waveguide or input waveguides, the surface is present where the light splitter has an image from incoming light, and internal corners are not present in the part.

Light wave guide with low reflectivity

A transition part () between two optical waveguides () with different index contrast is characterised in that the transition part () includes a non-adiabatically up-tapered longitudinal section (), and in that the transition () between the two waveguides () is arranged after the up-tapered longitudinal section () as seen along the main direction (L) of propagation of the light. A method of manufacturing the transition part is also described.

Transition device for optical waveguides

An integrated photonic circuit includes waveguides (-) and other photonic components. The photonic circuit has a first part () and a second part (), the first part and the second part being connected to a mirror in the form of a half 2&#xd7;2 multimode interferometer (MMI) (), which comprises solely one half MMI () in a longitudinal direction, the half MMI () having two ports () and being arranged to reflect half of the light that is incident on one of the ports to one port and transmit half of the incident light to the second port, and the free surface () of the half MMI () having been treated with a highly reflective material.

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Stockholm, Sweden

Jan-Olof Wesstrom