A wavelength-tunable light source device includes: a wavelength-tunable laser element including: a laser resonator having two reflecting mirrors having respective periodic peaks of reflection spectrums with respect to wavelength, cycles of the periodic peaks being different from each other; a gain unit in the laser resonator; and a plurality of control elements that control respective laser emission wavelengths in response to electric power supplied thereto; and a control unit that controls the electric power supplied to the control elements. Further, the control elements set, on a basis of the electric power, respective at least wavelength positions where the reflection spectrums of the two reflecting mirrors peak, and the control unit controls the control elements by setting, as sequential control targets, wavelength corresponding control set values, which correspond to discrete intermediate wavelengths between a current laser emission wavelength and a target wavelength.

A wavelength-tunable light source device includes: a wavelength-tunable laser element including: a laser resonator having two reflecting mirrors having respective periodic peaks of reflection spectrums with respect to wavelength, cycles of the periodic peaks being different from each other; a gain unit in the laser resonator; and a plurality of control elements that control respective laser emission wavelengths in response to electric power supplied thereto; and a control unit that controls the electric power supplied to the control elements. Further, the control elements set, on a basis of the electric power, respective at least wavelength positions where the reflection spectrums of the two reflecting mirrors peak, and the control unit controls the control elements by setting, as sequential control targets, wavelength corresponding control set values, which correspond to discrete intermediate wavelengths between a current laser emission wavelength and a target wavelength.

An optical device (100) for an optical network, comprising an optical input (110), a passive optical component (112), a memory device (114) for storing information relating to the passive optical component. The optical device further comprises an optical splitter (116) configured to power split off a portion of received optical signals to form split optical signals and to output the remaining optical power of received optical signals to the passive optical component and a photodetector (118) configured to receive the split optical signals and to generate a corresponding photodetector output signal. Further the optical device comprises an accumulator (120) configured to be charged by the photodetector output signal, a laser (122) configured to be powered by the accumulator and a controller (124) configured to, in response to a trigger from the photodetector, read said information from the memory device and to cause the laser to transmit an optical signal from an optical output (110), the optical signal carrying a message based on said information read from the memory device.

Provided is a semiconductor laser including: a core layer having an active layer and a diffraction grating layer optically coupled to the active layer; and paired clad layers arranged sandwiching the core layer, and formed with a waveguide along the core layer, and the semiconductor laser includes: a flat layer provided continuously with the diffraction grating layer along the waveguide; and a temperature control mechanism for controlling the temperature of the flat layer to a temperature different from that of the diffraction grating layer.

A structure for impedance signal lines of a transistor outline (TO)-can type semiconductor package is disclosed. The TO-can type semiconductor package may include a header including a semiconductor laser diode disposed on one side thereof; a signal line penetrating the header and including a one end protruding from the one side of the header; and an edge-coupled microstrip (ECM) portion connected to the signal line. The ECM portion is configured to include a dielectric and ECM lines are formed as conductive patterns having predetermined widths and leaving a predetermined space therebetween on a first side of the dielectric, and respectively connected to the signal lines.

An optical signal transmitter (AXEL) in which a quality of an optical signal waveform is maintained includes a distributed Bragg reflector to be coupled with an emission end surface of an SOA in an optical circuit unit including an optical waveguide core portion formed on an upper surface of a substrate. In the optical circuit unit, a diffraction grating formed on an upper surface side opposite to an absorption layer of an EA optical modulator and a diffraction grating formed on an upper surface side of a reflection layer of the distributed Bragg reflector have a wavelength selectivity.

An optical signal transmitter (AXEL) in which a quality of an optical signal waveform is maintained includes a distributed Bragg reflector to be coupled with an emission end surface of an SOA in an optical circuit unit including an optical waveguide core portion formed on an upper surface of a substrate. In the optical circuit unit, a diffraction grating formed on an upper surface side opposite to an absorption layer of an EA optical modulator and a diffraction grating formed on an upper surface side of a reflection layer of the distributed Bragg reflector have a wavelength selectivity.

A sensor system includes an optical aperture, a light source configured to generate a light pulse along a first optical path, a reflective surface configured to reflect the light pulse from the first optical path to a second optical path for passing through the optical aperture, a beam steering device positioned in the optical aperture and configured to steer the light pulse along different directions to one or more objects in an angle of view of the sensor system, a detector configured to receive a reflected light pulse and convert the reflected light pulse into an electrical signal, the reflected light pulse being reflected back from the one or more objects and passed through the beam steer device, and a spatial filtering device positioned between the beam steering device and the detector to block undesirable light in both the light pulse and the reflected light pulse.

Various optical systems equipped with diode laser light sources are discussed in the present application. One example system includes a diode laser light source for providing a beam of radiation. The diode laser has a spectral output bandwidth when driven under equilibrium conditions. The system further includes a driver circuit to apply a pulse of drive current to the diode laser. The pulse causes a variation in the output wavelength of the diode laser during the pulse such that the spectral output bandwidth is at least two times larger the spectral output bandwidth under the equilibrium conditions.

A system, method, and apparatus for continuous seed laser pulses supplied to a CW pumped pre-amplifier and/or power-amplifier chain comprises an optical modulator configured to impress pulse signals on an optical signal, a waveform generator configured to establish a structure of the optical signal, and a keep-alive circuit that generates a continuous electrical pulse pattern provided to the optical modulator, wherein the system provides a continuous seed laser pulse structure.