A control circuit in this laser equipment drives a drive circuit of a photonic crystal laser element under a predetermined condition. It was found that a wavelength width of a laser beam to be output from the photonic crystal laser element is dependent on a standardized drive current k and a pulse width T, and had a predetermined relationship with these. By meeting this condition, a laser beam with a plurality of wavelengths can be controlled and output.

In an embodiment, a low side driver integrated circuit for a laser diode includes a reference transistor, an output transistor having a gate coupled to a gate of the reference transistor, a first transistor having a gate for receiving a pulsed signal, a drain coupled to a drain of the output transistor and a source coupled to ground, a second transistor, for obtaining a source voltage of the output transistor equal to the source voltage of the reference transistor, a first servo-control circuit for applying a drain voltage of the output transistor to the drain of the reference transistor, and a second servo-control circuit for applying a static reference voltage to the source of the reference transistor.

In one embodiment, a lidar system includes a multi junction light source configured to emit an optical signal. The multi junction light source includes a seed laser diode configured to produce a seed optical signal and a multi junction semiconductor optical amplifier (SOA) configured to amplify the seed optical signal to produce the emitted optical signal. The lidar system also includes a receiver configured to detect a portion of the emitted optical signal scattered by a target located a distance from the lidar system. The lidar system further includes a processor configured to determine the distance from the lidar system to the target based on a round-trip time for the portion of the scattered optical signal to travel from the lidar system to the target and back to the lidar system.

A system is disclosed which includes a laser which has a calibrated optical power and a calibrated tolerance. The system includes a driving circuit configured to generate a first current pulse and a second current pulse. The system includes a primary observer module configured to observe a first and second primary input. The system includes one or more secondary observer modules configured to observe one or more first and one or more second secondary inputs. The system includes a controller communicatively coupled to the laser, driving circuit, primary observer module, and the one or more secondary observer modules. The controller is configured to receive an information packet, calculate an optical power, determine a deviation of the optical power from the calibrated optical power, compare the deviation with the calibrated tolerance, and perform an action if the deviation exceeds the calibrated tolerance.

The present disclosure relates to the technical field of optical communication, and particularly to a laser emitting system, including a burst signal controller, a transfer switch, a power supply, a laser device and a bypass circuit, the burst signal controller is connected with the transfer switch and used for sending a burst control signal to the transfer switch, and the transfer switch is used for connecting the power supply to the laser device or the bypass circuit according to the burst control signal. The establishment time of an optical signal of a laser device can be shortened by using the laser emitting system of the present disclosure.

A power beaming system includes a power beam transmitter arranged to transmit the power beam, and a power beam receiver arranged to receive the power beam from the power beam transmitter. A power beam transmission source is arranged to generate a laser light beam for transmission by the power beam transmitter from a first location toward a remote second location. A beam-shaping element shapes the laser light beam, at least one diffusion element uniformly distributes light of the shaped laser light beam, and a projection element illuminates a power beam receiving element of predetermined shape with the shaped laser light beam. At the power beam receiver, a diffusion surface diffuses a portion the power beam specularly reflected from the power beam receiver.

The present invention discloses a VCSEL array that is divided into at least a first and a second area. The first area covers the center of the array and is surrounded by the second area. The first area would experience higher temperature than the second area after the VCSELs in both areas are turned on for a given time period. VCSELs in the first area are electrically connected to a first metal layer portion. VCSELs in the second area are electrically connected to a second metal layer portion. The first and second metal layer portions are electrically insulated from each other.

A passive Q switching laser device according to an embodiment of the present technology includes: a passive Q switching laser; a signal source; a modulation unit; and a power source unit. The passive Q switching laser includes an excitation light source that emits excitation light, and a resonator that is excited by the excitation light to emit oscillation light. The signal source outputs a drive signal for driving the excitation light source. The modulation unit modulates, on the basis of emission timing at which the oscillation light is emitted from the passive Q switching laser, the drive signal output from the signal source. The power source unit drives, on the basis of the drive signal modulated by the modulation unit, the excitation light source to emit the excitation light.

An optical chip may include a vertical-cavity surface-emitting laser (VCSEL) structure. The optical chip may include a capacitor over at least a portion of an active layer of the VCSEL structure that is outside of an active region of the VCSEL structure. The capacitor may include a first metal layer over the portion of the active layer, a dielectric layer on the first metal layer, and a second metal layer on the dielectric layer. The optical chip may include an isolation region between a substrate of the VCSEL and a portion of the capacitor outside of the VCSEL.

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.