An optical network unit (ONU) comprising a media access controller (MAC) configured to support biasing a laser transmitter to compensate for temperature related wavelength drift receiving a transmission timing instruction from an optical network control node, obtaining transmission power information for the laser transmitter, estimating a burst mode time period for the laser transmitter according to the transmission timing instruction, and calculating a laser phase fine tuning compensation value for the laser transmitter according to the burst mode time period and the transmission power information, and forwarding the laser phase fine tuning compensation value toward a bias controller to support biasing a phase of the laser transmitter.

Described herein is a fiber laser coupler, comprising a fiber laser cable enclosed in a housing, the housing includes a circuit and a temperature sensitive variable resistance element (TSVRE) coupled to the circuit, wherein the TSVRE is in thermal contact with one or more locations within the housing and is configured to provide a resistance in the circuit associated with a temperature of the TSVRE, wherein the circuit is further configured to couple to a processor configured to determine a temperature of the TSVRE based on reading the resistance in the circuit.

A hybrid external cavity multi-wavelength laser using a QD RSOA and a silicon photonics chip is demonstrated. Four lasing modes at 2 nm spacing and less than 3 dB power non-uniformity were observed, with over 20 mW of total output power. Each lasing peak can be successfully modulated at 10 Gb/s. At 10.sup.−9 BER, the receiver power penalty is less than 2.6 dB compared to a conventional commercial laser. An expected application is the provision of a comb laser source for WDM transmission in optical interconnection systems.

The invention relates to a radiation-emitting semiconductor laser comprising—a semiconductor body comprising an active region which is designed to generate electromagnetic radiation, —a resonator which has a first end region and a second end region, and —a first sensor layer which is designed to measure the temperature of the semiconductor body, wherein the active region is located in the resonator in such a way that the electromagnetic radiation generated in the active region during operation is electromagnetic laser radiation, and —the first sensor layer is located in the first active end region of the resonator. The invention also relates to a method for operating a radiation-emitting semiconductor laser.

A solid-state laser system may include a first solid-state laser unit, a second solid-state laser unit, a wavelength conversion system, a wavelength detector, and a wavelength controller. The wavelength conversion system may receive a first pulsed laser light beam with a first wavelength and a second pulsed laser light beam with a second wavelength, and output a third pulsed laser light beam with a third wavelength converted from the first and second wavelengths. The wavelength controller may control the first solid-state laser unit to vary the first wavelength on a condition that an absolute value of a difference between a value of a target wavelength and a value of the third wavelength detected by the wavelength detector is equal to or less than a predetermined value, and control the second solid-state laser unit to vary the second wavelength on a condition that the absolute value exceeds the predetermined value.

The present invention provides a laser spot light with improved radiating structure which includes a cylindrical shell, a mounting board fixed within the cylindrical shell, at least one laser head, an inner radiator made from heat-conductive metal and configured for supporting the at least one laser head and fixed on the mounting board, and an outer radiator made from heat-conductive metal and fixed to the side wall of the cylindrical shell with a part of the outer radiator passing across the cylindrical shell and touching with the inner radiator. Therefore an inner heat can be conducted to the outside of the cylindrical shell, and an operation temperature of the laser head can be maintained in a normal range.

A Peltier effect heat transfer system (208) comprising: a plurality of heat transfer elements (301-308); wherein each heat transfer element (301-308) comprises at least one semiconductor element pair arranged to yield Peltier effect heat transfer, each semiconductor element pair comprising a P-doped semiconductor element (408) and an N-doped semiconductor element (410); and the heat transfer elements (301-308) are independent such that each heat transfer element (301-308) can be activated so as to yield Peltier effect heat transfer independently of each other heat transfer element (301-308).

Systems, devices, and methods for providing optical engines and laser projectors that are well-suited for use in wearable heads-up displays (WHUDs) are described. The optical engines of the present disclosure may integrate a plurality of laser diodes (e.g., 3 laser diodes, 4 laser diodes) within a single, hermetically or partially hermetically sealed, encapsulated package. Wavelength stabilization for the laser diodes is achieved by controlling the temperature of the lasers to always be in a particular range of operating specifications which provides wavelength stabilization that meets particular performance criteria. The lasers themselves may be used for temperature control by selectively switching them on to maintain their temperature within a specified range. Alternatively, compact resistive heaters may be positioned proximate the laser diodes to control the temperature of the laser diodes during operation. WHUDs that employ such optical engines and laser projectors are also described. Additionally, optical systems for collimating and shifting light beams are described.

A calculation part calculates a maximum temperature reached which is reached by the coolant or component of each part, in the case of machining in accordance with laser machining conditions that were inputted or set, based on the cooling capacity of a chiller, tank volume of the chiller, heat generation amount from the laser oscillator, heat capacity of a cooled part of the laser device, etc. which are recorded in a recording part, and the temperature of each part measured by temperature detection parts, etc. In the case that the maximum temperature reached would exceed the allowed maximum temperature, a warning is made prior to starting laser machining.

The present invention discloses a method, an apparatus, an optical component and an optical network system for controlling an operating temperature of an optical component. The method includes: acquiring an external ambient temperature of the optical component; setting a target control temperature of a temperature controller according to the external ambient temperature, where the target control temperature is a function value of the external ambient temperature, and the target control temperature is within a range from an operating temperature lower limit of a laser to an operating temperature upper limit of the laser; and controlling, according to the target control temperature, an operating temperature of the optical component by means of heating or cooling by using the temperature controller.