摘要:
The invention relates to an injected laser (200) comprising an optical gain medium (2) placed inside a triggered laser cavity (3), the optical gain medium (2) having a spectral gain bandwidth. According to the invention, the injected laser (200) includes an optical device (20) for modulating phase, which device is placed between the injection source (11) and the laser cavity (3), the optical device (20) for modulating phase being configured to periodically modulate as a function of time a phase of the monochromatic continuous-wave laser radiation (10) at a modulating frequency (fm) equal to a natural integer multiple of the free spectral range (FSR) of the laser cavity (3), so that the phase-modulated injection source generates polychromatic injection radiation (120).
摘要:
A semiconductor device comprising a substrate; a monolithic gain region disposed on the substrate and operable to produce optical gain in response to current injection, including a first electrode over a first portion of the gain region having a first length L1, with a first current I 1 being applied; and a second electrode over a second portion of the gain region having a second length L 2 , with a second current I 2 being applied; wherein I 1 /L1 is greater than I 2 /L 2 .
摘要:
A technique is described for eliminating feedback light in a high-power optical device. An optical device (54) is provided that generates, along an optical pathway, an output light (68) at a desired signal wavelength, wherein the generation of the output light at the signal wavelength results in the generation of a feedback light (74) at an undesired feedback wavelength. A port (76) is provided at a selected location along the optical fiber pathway. The port is terminated with a length of a filter fiber (78), wherein the filter fiber has loss characteristics at the feedback wavelength that result in the elimination of feedback light from the optical fiber pathway through the port.
摘要:
According to one aspect, the invention relates to an optic fiber amplifier having a high Brillouin threshold, and including: an amplification optic fiber (16) comprising a core and a sheath and suitable for amplifying a signal beam travelling in said core; means for coupling the signal beam in an input end of said amplification optic fiber; means for coupling a pump laser beam for pumping said amplification optic fiber; a structure (330, 340) including a deformable portion around which at least one portion of said amplification optic fiber is wound in the shape of turns, said turns being in contact with a surface of said deformable portion, wherein the friction of said optic fiber on said surface resulting, during the deformation of said deformable portion, in an elongation of said amplification optic fiber according to an elongation profile that varies from one turn to the other.
摘要:
The invention relates to a cladding-pumped optical device (40), comprising: an optical fibre (41) and pumps (44), wherein the optical fibre (41) comprises a core having a refractive index n1 and a pedestal having a refractive index n2, and wherein the optical fibre (41) includes a first cladding made of glass having a refractive index n3 surrounding the pedestal, wherein n1 is greater than n2, n2 is greater than n3, wherein the optical device (40) is cladding pumped by coupling pump radiation into at least the first cladding (5), and wherein signal light scattering or leaking from the core is captured and guided by the pedestal and therefore not routed back into the pumps (44).
摘要:
Disclosed are multi-stage optical amplifiers that propagate higher-order mode (HOM) signals. One embodiment, among others, comprises a first segment of optical fiber in which a first HOM signal propagates, a second segment of optical fiber in which a second HOM signal propagates, and a mode converter that converts the first HOM signal into the second HOM signal.
摘要:
Modular set is formed by optical module (1) interconnected with control module (2) of electronic system. Optical module (1) is formed by at least two pairs (10, 11, 12, 13) of laser diodes connected in series and including Peltier cooler and thermistor, which are connected to inputs of polarizing fiber combiners (14, 15, 16, 17), and depolarized outputs of these polarizing fiber combiners are connected to inputs of a wavelengths combiner (18). Module (2) of the electronic system is formed by a control microprocessor (20) interconnected with direct current power supply source (21), with PID regulators (25) of laser diodes temperature, a display indicating temperature of individual laser diodes and current flowing through them, and a control panel. To the microprocessor (20) of the module (2) of the electronic system is connected a gate array (22) and to this gate array (22) are connected generators (23) of current impulses, which do not overlap in time, and their widths, repetition frequencies and amplitudes are adjustable, while the number of generators (23) of current impulses equals to the number of pairs (10-13) of laser diodes and their outputs are connected via power stages (24) to pairs (10-13) of laser diodes connected in series, and where to the power stages (24) is connected an analogue/digital converter (210), which is connected also to the microprocessor (20).
摘要:
Disclosed are multi-stage optical amplifiers that propagate higher-order mode (HOM) signals. One embodiment, among others, comprises a first segment of optical fiber in which a first HOM signal propagates, a second segment of optical fiber in which a second HOM signal propagates, and a mode converter that converts the first HOM signal into the second HOM signal.
摘要:
Disclosed are multi-stage optical amplifiers that propagate higher-order mode (HOM) signals. One embodiment, among others, comprises a first segment of optical fiber in which a first HOM signal propagates, a second segment of optical fiber in which a second HOM signal propagates, and a mode converter that converts the first HOM signal into the second HOM signal.