68 results about "Fibre amplifier" patented technology

An optical network and a method of provisioning an optical network are described. The optical network includes a first passive optical network optical line terminal arranged to transmit a first optical signal at a first wavelength, coupled to a first port of a first optical filter arrangement, and a second passive optical network optical line terminal arranged to transmit a second optical signal at a second, different wavelength, coupled to a second port of the first optical filter arrangement. An optical coupler is connected between the second passive optical network line terminal and the second port of the first optical filter arrangement, for coupling a plurality of optical signals at a predetermined set of wavelengths from a third optical line terminal into the second port. A passive optical distribution node, for connection to a plurality of optical network terminations, is coupled to a third port of the first optical filter arrangement for distribution of optical signals between the optical line terminals and the plurality of optical network terminations. The first optical filter arrangement is arranged to pass optical signals at the first wavelength between the first port and the third port and to block optical signals at the second wavelength and the predetermined set of wavelengths between the first port and the third port, and the first optical filter arrangement is further arranged to pass optical signals at the second wavelength and the predetermined set of wavelengths between the second port and the third port and to block optical signals at the first wavelength between the second port and the third port. The second optical signal is at a faster rate than the first optical signal, and the second wavelength and the predetermined set of wavelengths are within an amplification band of a doped fibre amplifier.

Techniques for improving gain equalization in C- and L-band (''C+L'') erbium-doped fiber amplifier (EDFAs) are provided. For example, the C- and L-band amplification sections of a C+L EDFA may be separated and configured in a parallel arrangement or a serial arrangement. For both the parallel and serial arrangements, the C- and L-band amplification sections may share a common gain flattening filter (GFF) or each amplification section may include and employ a separate GFF. Moreover, in some examples, an ''interstage'' L-band GFF may be located before or upstream of the L-band amplification section such that the L-band optical signal is gain-equalized or flattened prior to the L-band amplification section amplifying the L-band.

The invention provides a rectangular optical frequency comb generation system based on an on-chip silicon nitride micro-ring. The system comprises a tunable laser, a first optical coupler, a second optical coupler, an erbium-doped fiber amplifier, a polarization controller, a first optical isolator, a second optical isolator, a Si3N4 micro-ring resonant cavity, a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a data acquisition unit and a polarizer. Compared with an optical frequency comb based on dissipative optical solitons in a microcavity inthe prior art, the provided system has the following advantages: the comb tooth power of the rectangular optical frequency comb is remarkably more uniform, and particularly, a problem that the edge power of the optical frequency comb is reduced is solved, so that more comb tooth power is maintained at a high level, and the energy conversion efficiency of the optical frequency comb and the absoluteenergy of the comb teeth are remarkably improved.

The invention relates to the field of fiber laser, in particular to a mid-infrared 4mu m fiber laser amplifier based on a Dy-doped chalcogenide glass fiber, which mainly structurally comprises a pumping source, a focusing lens, a Dy-doped chalcogenide glass fiber, a dichroic mirror, a reflector and a signal source. According to the 4-micron waveband intermediate infrared optical fiber amplifier based on the chalcogenide gain optical fiber, stable, high-gain, high-signal-to-noise-ratio and wavelength-continuously-adjustable 4-micron waveband amplified signal laser output is achieved, and the problem that the output power of a current 4-micron waveband laser light source is low is solved.

Disclosed herein are Low Size Weight and Power efficient Laser Diode pump modules and High Power Fiber Amplifiers incorporating such pump modules for amplifying laser light produced by a seed laser. The pump modules are configured for forced fluid cooling, and are provided with cooling channels that allow for varying combinations of a coolant mass flow rate F of the coolant, a pressure drop P of the coolant, and a steady state temperature T of the laser diodes in the pump modules, uniquely and significantly, and thereby allowing for optimizing such variables for a particular application.

The invention discloses a blood alcohol testing device based on a 1.7 mu m waveband dual-wavelength laser light source, belongs to the technical field of laser detection and aims to solve a problem that an infrared spectrum alcohol concentration measuring device is low in measuring precision in the prior art. The device comprises a pump laser, an erbium-doped fiber amplifier, a fiber isolator, a first fiber circulator, a thulium-doped fiber, a photonic crystal fiber, a fiber coupler, a first collimator, test paper, a second collimator, a reflection grating, a detector, a data acquisition and processing module, a detection detector, an alarm device, a second fiber circulator, a switch, a first fiber bragg grating and a second fiber bragg grating. The device is advantaged in that dual-wavelength measurement is adopted, influence caused by other factors except the wavelength can be eliminated, measurement precision is improved, and the device uses an all-fiber device to generate 1.7 [mu]m waveband laser, and is compact in structure and high in stability, the equipment can be integrated into a small size, is convenient to carry and has wide application.

The invention discloses a phase-frequency noise characteristic measurement technique for a weak laser signal, the phase-frequency noise characteristic measurement technique for the weak laser signal comprises a to-be-measured weak laser light source, an erbium-doped fiber amplifier, a coupler, a 120-degree phase difference interferometer and an industrial personal computer; the to-be-measured weaklaser light source amplifies a weak signal of the light source through the erbium-doped fiber amplifier, the amplified signal of the light source is split into two light sources by the coupler, the first light source is used for testing the phase-frequency noise characteristic of the to-be-measured weak laser light source, the second light source is used for feeding back the amplified signal of the light source to a power detection unit, and the laser power incident on the 120-degree phase difference interferometer is kept on the same level; and the first light source is incident on the 120-degree phase difference interferometer, the 120-degree phase difference interferometer is used for demodulating differential phase information of the signal of the first light source, and the differential phase information is transmitted to the industrial personal computer to be analyzed. The phase-frequency noise characteristic of the weak signal is tested, and the phase-frequency noise characteristic measurement technique is favorable for studying the influence of the weak signal on the whole system performance.

The invention discloses a device and method for generating high-quality pulse trains based on Peregrine solitons, comprising: a Peregrine soliton generator (1), a saturable absorber (2), an erbium-doped fiber amplifier (3), a first single mode fiber (4), isolator (5), polarization controller (6), spectrum analyzer (7) and optical sampling oscilloscope (8); the beneficial effects of the present invention are: (1) utilize saturable absorber to eliminate Peregrine The background wave of the soliton; (2) amplified by an erbium-doped fiber amplifier and transmitted in a single-mode fiber to obtain a breathing pulse for long-distance stable transmission, which suppresses the splitting of the Peregrine soliton in the fiber; (3) realizes The method is relatively simple, and provides a new method for generating light pulses.

The invention relates to the field of fiber lasers and provides an optical fiber pulse amplifier which can be used for amplifying pulse signals of two bands. The technical scheme includes that a dual-band erbium ytterbium doped fiber optic pulse amplifier comprises a pumping source, a pumping-source pulse driving power source, two different band signal sources, signal source pulse driving power sources, a time-delay control circuit, isolators, a wavelength division multiplexer, a pumping / signal combiner, gain fiber and a fiber end cap. The pumping-source pulse driving power source is used for driving the pumping source to send out laser pumping pulses which are injected into the gain fiber to pump the same via the pumping / signal combiner; synchronizing signals sent out by the pumping-source pulse driving power source are properly delayed through the time-delay control circuit to trigger two signal source pulse driving power sources to drive the two different band signal sources to send out signal pulses respectively; and two signal pulses pass the respective isolators and are coupled together to perform amplifying output via the wavelength division multiplexer. The optical fiber pulse amplifier is mainly applicable to amplification of the dual-band pulse signals.

The present invention relates to a fiber laser sensor, in particular to a forward Brillouin fiber laser sensor based on stimulated Raman, including a tunable single-frequency laser, an erbium-doped fiber amplifier, a polarization controller, an optical coupler, a single Mode optical fiber, temperature / strain control system, polarization beam combiner, photodiode, spectrum analyzer, spectrometer; temperature / strain control system consists of optical fiber fixing fixture and heater. The invention has a reasonable design, uses a forward-stimulated Raman-like Brillouin fiber laser, and detects the stimulated Raman-like scattering-like R 0m The frequency shift of the Brillouin mode realizes temperature and strain sensing with adjustable sensitivity.

An open space gas average concentration measurement device and measurement method, the device includes a semiconductor laser, a semiconductor laser controller, a fiber coupler, an erbium-doped fiber amplifier, a photodetector, an optical transceiver antenna, a single-mode fiber and a data processing unit; Optical cavity ring-down technology, respectively measure the cavity ring-down time of the laser at the peak wavelength of the absorption spectrum of the gas to be measured and the laser at the wavelength outside the absorption spectrum range, calculate the absorption coefficient of the gas, and then use the gas absorption coefficient and absorption cross-section and The relationship between the concentration and the absolute concentration of the gas is calculated; at the same time, the detection distance is calculated by measuring the time interval of the ring-down pulse; the average concentration of the gas is calculated by the integral concentration of the gas in the known open space and the detection distance; this method has the ability to measure High sensitivity, strong anti-interference ability.