摘要:
Systems, and apparatus for adding reflection based pre-emphasis to a laser driver. In one aspect, a device includes a load (e.g. a laser) having a load impedance, a first end of a transmission line connected to the load, and a reflective impedance element connected to a second end of the transmission line. The reflective impedance element has a given impedance value that differs from the transmission line's characteristic impedance, and the characteristic impedance differs from the load impedance. This mismatch causes reflections between the reflective impedance element and the load. The reflections between the reflective impedance element and the load combine with an incident signal at the load to create a target signal having a target spectral shape.
摘要:
L'invention concerne un dispositif de commande d'une diode (102) comprenant : une première borne (106) d'application d'un premier potentiel d'alimentation ; une seconde borne (108) d'application d'un deuxième potentiel d'alimentation ; un circuit (301) d'application d'une tension sur une troisième borne (306) destinée à être connectée à une anode (304) de la diode, ladite troisième borne étant reliée à une première borne d'entrée (308) dudit circuit ; une deuxième borne d'entrée (307) dudit circuit ; et une résistance (104) couplée entre ladite seconde borne (108) et une quatrième borne (311) destinée à être connectée à une cathode (309) de ladite diode, ladite quatrième borne étant couplée à une troisième borne d'entrée (310) du circuit (301).
摘要:
Systems and methods are disclosed herein for controlling laser beams for a plurality of collocated laser assemblies. The laser beams are optimized by controlling outputs of a primary power source (current for generating a laser beam) and a secondary power source (heating device) for each of the respective laser assemblies. The states of the power supply may be cycled and modulated to provide optimal performance.
摘要:
An optical communication subassembly includes one or more optoelectronic devices, one or more optical elements, and a transceiver light coupling unit. Each optical element is configured to change a divergence of the outgoing light relative to a divergence of the incoming light and is spaced apart from and optically aligned with a corresponding optoelectronic device. The transceiver light coupling unit has a mating surface configured for mating with a connector light coupling unit attached to an optical waveguide. A mating direction of the optical light coupling unit forms an angle with the mating surface of the transceiver light coupling unit such that when the connector light coupling unit mates with the transceiver light coupling unit, the angle between the mating direction of the connector light coupling unit and the mating surface of the transceiver light coupling unit causes the optical waveguide to bend.
摘要:
A multi-wavelength distributed Bragg reflector (DBR) semiconductor laser is provided where DBR heating elements are positioned over the waveguide in the DBR section and define an interleaved temperature profile that generates multiple distinct reflection peaks corresponding to distinct temperature dependent Bragg wavelengths associated with the temperature profile. Neighboring pairs of heating elements of the DBR heating elements positioned over the waveguide in the DBR section are spaced along the direction of the axis of optical propagation by a distance that is equal to or greater than the laser chip thickness b to minimize the impact of thermal crosstalk between distinct temperature regions of the interleaved temperature profile.
摘要:
A solid-state lighting device includes a light source section, a light emitting section, a light receiving section, a light guiding section, and a protection circuit. The light source section has a semiconductor laser including a light emitting layer made of nitride, and a driving circuit. The light source section emits laser light having a wavelength range from bluish purple to blue. The light emitting section includes a heat conduction part which includes a wavelength conversion layer absorbs the laser light and emits wavelength-converted light, and an optical part which is capable of guiding the laser light. The light receiving section is capable of detecting returning light from the optical part. The light guiding section guides the laser light from the light source section toward the optical part, and guides returning light from the optical part toward the light receiving section. The protection circuit outputs a driving stop signal toward the driving circuit if it is detected that amount of the returning light is not included in a prescribed range using an electrical signal output from the light receiving section. The driving circuit stops driving the semiconductor laser if the driving stop signal is input.