565 results about "Optical isolator" patented technology

The invention relates to a 400G DR4 silicon optical chip, which is characterized in that one input end of a 2 * 2 coupler is coupled with an input waveguide, the other input end of the 2 * 2 coupler is coupled with one of four output waveguides, the output waveguide coupled by the 2 * 2 coupler reversely splits light to enter the 2 * 2 coupler, and the output waveguide is coupled with the other input end of the 2 * 2 coupler; light of each output end of the 2 * 2 coupler is divided into the two MZM modulators at equal ratio, and the four MZM modulators are respectively coupled with the four output waveguides. A 400G DR4 silicon optical module is characterized in that a light emitting end is coupled with an input waveguide of a 400G DR4 silicon optical chip through an aspheric lens and an optical isolator in sequence, and four output waveguides of the 400G DR4 silicon optical chip are coupled with a multi-channel optical fiber array. The beneficial effects are that even if the MPD and the MPD current amplification circuit are not provided, when the MPD current amplification circuit is applied to the optical module, the aspherical lens and the multi-channel optical fiber array can be coupled at the optimal position.

The invention discloses an optical frequency comb generation method and device based on Brillouin scattering and an electro-optical modulator, and belongs to the field of photoelectric measurement. The method comprises the steps that a first laser and a second laser are used for generating pump light and seed light respectively, multi-wavelength pump light is generated through a cascade electro-optical modulator, the pump light and the seed light are emitted into a Sagnac loop, an optical frequency comb is output through the forward Brillouin scattering effect of an optical fiber and the electro-optical modulator, and the seed light and the pump light are output. The polarization controller is adjusted to optimize polarization state matching of the pump light and the seed light, so that the Brillouin scattering effect reaches the maximum value. The device is composed of a laser, an electro-optical modulator, a signal generator, an optical amplifier, an optical isolator, an optical coupler, a polarization controller and an optical fiber. The optical fiber forward Brillouin scattering effect and the electro-optical modulator are combined, the optical frequency comb giving consideration to the wide frequency spectrum and the narrow interval is generated, meanwhile, the comb tooth interval of the optical frequency comb can be accurately controlled by independently adjusting the frequency of the signal generator, and accurate measurement of signals or objects is achieved.

The invention discloses a wavelength-adjustable high-power picosecond all-solid-state laser. The microchip seed source adopts a passive Q-switching principle, can directly generate laser with the pulse width as narrow as 300ps, is high in seed laser efficiency, good in beam quality and large in energy, can synchronously output TTL (transistor-transistor logic) level, and is used for controlling the pulse duration and delay of a 808nm QCW pumping source; the optical isolator protects the front-stage microchip solid laser from being damaged by returned light of the rear-stage amplifier; the single-rod two-way end pump amplifier amplifies laser pulse energy output by the microchip solid laser; the light beam shaper comprises a Galileo laser beam shrinking system and a soft edge diaphragm and is used for shaping light beams; the single-rod one-way end pump amplifier amplifies the pulse energy of the preceding-stage laser; and the frequency multiplier performs frequency conversion on the output laser, and outputs wavelength-adjustable picosecond laser with millifocus magnitude, high power and high beam quality.

The invention relates to the technical field of laser ranging, in particular to a double-optical-comb hybrid ranging device which comprises a signal detection optical path system and a signal demodulation optical path system. Wherein the signal detection optical path system comprises a first optical frequency comb, a first optical isolator, a first optical collimator, a first beam splitter prism, a reference mirror, a Faraday rotator, a convergence mirror and a target reflector; the signal demodulation optical path system comprises a second optical frequency comb, a second optical isolator, a second optical collimator, a half-wave plate, a second beam splitter prism, a third beam splitter prism, a first polarization controller, a first photoelectric detector, a reflector, a polarization beam splitter prism, a second polarization controller and a second photoelectric detector. A third polarization controller; and a third photoelectric detector. According to the invention, three ranging technologies of asynchronous optical sampling ranging, multi-heterodyne interference ranging and synthetic wavelength ranging are fused, and the problem that a large ranging range and high ranging precision cannot be simultaneously considered in the ranging process is solved.

The invention discloses a method and a device for outputting large-energy picosecond pulse laser with external synchronization picosecond-level jitter. The device comprises a high-precision time sequence controller, a semiconductor picosecond pulse seed source, an optical isolator and a high-gain and high-stability regenerative amplifier. The semiconductor picosecond pulse seed source outputs low-energy picosecond-level (10-12J, pJ) and low-jitter picosecond-level (10-12s, ps) picosecond pulse seeds under the trigger of a time sequence controller of a high-precision external clock, the picosecond pulse seeds enter the high-gain high-stability regenerative amplifier through the optical isolator, and the high-gain high-stability regenerative amplifier outputs high-energy picosecond-level (10-12s, ps) picosecond pulse seeds under the control and adjustment of the high-precision time sequence controller. The picosecond pulse seed is locked to be regenerated and amplified in the regenerative amplifier, and the energy of the picosecond pulse seed with low energy and low jitter at a picofocus (pJ) level is amplified to uJ-mJ (10 <-6 > J-10 <-3 > J), so that low jitter and large energy output of laser pulses and trigger signals are realized, and application development of high-precision laser ranging, laser communication, time-frequency transmission and the like is effectively promoted.

The invention belongs to the technical field of optoelectronic devices, and provides a laser gyroscope frequency stabilization system and a frequency stabilization method thereof.The laser gyroscope frequency stabilization system comprises a large laser gyroscope to be subjected to frequency stabilization, an electro-optical modulator, an adjusting light path, a signal generator, a mode matching mirror set, a PID regulator, a frequency mixer, a photoelectric detector, an ultra-stable cavity, a low-pass filter, a computer and a data acquisition card; and a square transmission light path is arranged in the ultra-stable cavity. According to the invention, the problem of insufficient isolation caused by an optical isolator consisting of a polarization splitting prism and a 1 / 4 wave plate is effectively avoided, the influence of an optical feedback effect is reduced, and the optical isolator is better adapted to the field of high-precision measurement related to a large laser gyroscope.

The utility model relates to a high-capacity wavelength division multiplexing fiber bragg grating sensing system in the field of fiber sensing. The high-capacity wavelength division multiplexing fiber bragg grating sensing system comprises a mode-locked fiber laser, a spectrum expansion module, a three-port optical circulator, a fiber bragg grating array, a dispersion module, a photoelectric detector, a data acquisition module and a data processing module. The spectrum expansion module is composed of an optical fiber amplifier, a nonlinear element and a polarization controller; the optical fiber amplifier is composed of an optical isolator, an erbium-doped optical fiber, a wavelength division multiplexer and a pump light source. According to the sensing system, the dispersion Fourier transform technology is applied, the offset of the center wavelength of the fiber bragg grating is mapped into the offset of time delay between time domain reflected light pulses, and the demodulation rate and precision of the fiber bragg grating sensing system are improved; and by adding a spectrum expansion module, the spectrum of pulse data output by the light source laser is expanded into a super-continuum spectrum by using a nonlinear effect, and the simultaneous measurement of hundreds of fiber bragg grating sensors can be theoretically supported.

The invention discloses a guided-mode resonance refractive index detection device and method based on a longitudinal gradient grating structure, and belongs to the technical field of optical sensing and imaging spectrum detection, the guided-mode resonance refractive index detection device comprises a light source, an optical isolator, a polarization controller, a collimation beam expander, a guided-mode resonance sensing chip, an image detector and a signal processing unit which are connected in sequence; the guided-mode resonance sensing chip is of a transmission type structure, the top of the guided-mode resonance sensing chip is provided with a strip-shaped nano structure which is consistent in period but longitudinally gradually changed, and an image detector is arranged below the guided-mode resonance sensing chip and used for receiving a transmission light signal penetrating through the guided-mode resonance sensing chip, generating a transmission light image and transmitting the transmission light image to the signal processing unit; and the signal processing unit is used for analyzing the transmitted light image and inverting the refractive index of the medium to be measured according to the structure mapping model. According to the invention, the longitudinal structure gradual change characteristic is introduced into the guided-mode resonance chip, so that the spatial distribution control of the monochromatic light resonance response position is realized, and finally the imaging refractive index sensing without an optical splitter is realized.

The invention relates to a 400G DR4 silicon optical chip which is characterized in that two input waveguides are distributed in a splayed shape, beam opening ends of the two input waveguides face outwards, one input waveguide is inclined forwards by 8 degrees + / -1 degrees, the other input waveguide is inclined backwards by 8 degrees + / -1 degrees, and each input waveguide is respectively coupled with four output waveguides. A 400G DR4 silicon optical engine is characterized in that a light emitting assembly, an aspheric lens, an optical isolator, a prism and a 400G DR4 silicon optical chip are sequentially coupled in the light propagation direction, and the center of the optical axis of the light emitting assembly is located in the middle of two input waveguides in the 400G DR4 silicon optical chip; the light emitted by the light emitting assembly in the horizontal direction is turned by 8 degrees + / -1 degrees in the forward direction or the reverse direction by the prism and then is coupled into the input waveguide which is inclined by 8 degrees + / -1 degrees in the forward direction or the reverse direction. The beneficial effects are that the laser chip in the light emitting assembly can be pasted without inclining 8 degrees + / -1 degrees, the pasting difficulty can be reduced, and the light power and the yield can be improved.

The utility model provides a narrow-band single-fiber four-way wave combining optical device, which comprises a cube, and an optical port end, a laser end and a detector end which are arranged on three side surfaces of the cube, and the interior of the cube further comprises a low-optical-level wave dividing assembly, a double-channel free space optical isolator and C-l ens. The laser end emits two parallel wave band lights, the two parallel wave band lights are combined into one path after being isolated by the double-channel free space optical isolator and being refracted and reflected by the low-optical-level optical branching assembly for multiple times, and the C-lens converts the parallel lights into convergent lights and then couples and converges the convergent lights to the optical port end. Receiving wave band light input from the light port end is converted into parallel light through C-l ens, the parallel light enters the low-optical-level wave division assembly and is divided into two paths to enter the detector end after being refracted and reflected for multiple times, and the two paths of parallel receiving wave band light are converged to the two detector photosensitive surfaces through the detector end respectively. According to the narrow-band single-fiber four-way wave combining optical device, wave combining and wave dividing optical paths are optimized through the low-optical-level optical wave dividing assembly, the coupling efficiency and the isolation degree of the device are improved, crosstalk is reduced, meanwhile, all ports and structures are highly integrated, and the miniaturization design of the optical device is achieved.

Provided are polarization-mode controlled nonreciprocal optical waveguide devices, which are used in optical isolator and optical circulator devices. These devices offer a solution to the issues associated with traditional planar optical waveguide-based optical isolators, which are specific to a single polarization mode and result in significant optical loss. The new devices implement polarization-insensitive operation with minimal optical loss. They feature a magneto-optic (MO) film clad on one side and utilize waveguide mode converters or polarization-mode converters to guide the input light signals' mode or polarization. This reduces optical loss as the light passes through the interface between the non-MO clad region and the MO clad region and maximizes the MO effect within the MO clad region by ensuring proper polarization mode.

The invention relates to an external cavity high-power narrow-linewidth laser based on weak feedback, and the laser comprises a sub-light source output part which is used for outputting a sub-light source; the laser output part is used for outputting narrow linewidth laser; the isolator is arranged between the sub light source output part and the laser output part; the multi-layer reflecting film assembly is plated at the input end of the isolator or the output end of the sub light source output part and is used for filtering the sub light sources to form transmission light and feedback light; the rear end of the isolator outputs the transmission light to the laser output part, so that the transmission light is output as narrow-linewidth laser; and the sub light source output part is also used for receiving the feedback light so as to realize self-injection locking, and the laser has the advantages of high-power narrow-linewidth laser output, simple structure, low cost, simple process, relatively small packaging size and convenience in laser packaging.

The embodiments of the present disclosure discloses an optical isolator core and an optical isolator. The optical isolator core comprises: a first birefringent crystal, a first Faraday rotator, a second birefringent crystal, a second Faraday rotator, and a third birefringent crystal that are successively arrange in the forward light path, all of which are parallel plate structures. The embodiments of the present disclosure achieves backward isolation for polarization-independent and non-collimating beam which simplifies the device structure and assembly process, thereby reduce size and cost.

The utility model discloses a distributed sound wave sensing system for multi-frequency pulse modulation, and relates to the technical field of distributed sound wave sensing. The system comprises a narrow linewidth laser, an optical fiber coupler, a polarization-maintaining optical isolator, an acousto-optic modulator, a polarization-maintaining delay optical fiber, an erbium-doped optical fiber amplifier, a polarization-maintaining dense wavelength division multiplexer, an optical fiber circulator, an optical fiber Bragg grating, a piezoelectric transducer, a polarization controller, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator and the like. According to the utility model, the multi-frequency delay ring is utilized to carry out multi-frequency modulation, the frequency number of light waves is increased along with the circulation times of the light waves in the delay ring, and under the condition that the utilization of a large-bandwidth electro-optical modulator is not increased, the flexible modulation of the frequency is realized by utilizing a low-bandwidth acousto-optical modulator without being influenced by carrier frequency and sidebands of each order; the low-bandwidth acousto-optic modulator is used for frequency modulation in the multi-frequency delay ring, and compared with an electro-optical modulation or multi-acousto-optic / multi-light source modulation scheme, the modulation cost is effectively saved.

The invention discloses a nonlinear chirped fiber grating preparation structure based on speed regulation and control, and belongs to the field of laser technology and nonlinear optics. Comprising a light source displacement control scheme, a phase mask plate displacement control scheme and a grating inscribing and monitoring scheme. The optical, electrical and mechanical devices comprise a laser light source, a diaphragm, a plano-concave mirror, a plano-convex mirror, a cylindrical lens, an electric control displacement platform, a control program, a signal generator, a function editor, a precise displacement platform, an optical isolator, an optical circulator, a photosensitive optical fiber and an optical fiber analyzer. According to the non-linear chirp fiber grating preparation scheme based on speed regulation and control, the adjustable displacement speed is introduced while the uniform phase mask plate is used, flexible chirp regulation and control are achieved while simple and stable preparation is guaranteed, the preparation scheme of the non-linear chirp tube fiber grating is widened, and the preparation cost is reduced.

The present application relates to a kind of methods and applications of growing bismuth-doped rare-earth iron garnet BRIG crystal by guided mode pulling-top seed crystal method.For solving the problems of large internal stress, many defects, difficult to prepare thick film of single crystal in the current liquid phase epitaxy method of growing BRIG crystal;And the problems of long growth cycle, difficult to obtain seed crystal in top seed crystal method, the present application combines the fast growth of guided mode pulling crystal and the high-quality single crystal growth of top seed crystal method, and invents guided mode pulling-top seed crystal method to realize the fast growth of high-quality BRIG single crystal.First, the large-size doped rare-earth iron garnet crystal with high lattice matching and similar composition is quickly grown by guided mode pulling method, which is cut into centimeter-level seed crystal, and high-quality BRIG bulk single crystal is quickly grown by TSSG method.The crystal grown by this method has the advantages of small internal stress, less cracking, good uniformity, fast crystal growth, etc., and has obvious advantages in high-performance magneto-optical isolator.

The invention relates to the technical field of laser, in particular to a high-signal-to-noise-ratio modulation transfer spectrum frequency stabilization light path system. The system comprises a laser, an optical isolator, a first half-wave plate, a first polarization splitting prism, an optical fiber coupler, a second half-wave plate, a second polarization splitting prism, a first reflecting mirror, an electro-optical modulator, a second reflecting mirror and a third polarization splitting prism, wherein the first half-wave plate is used for adjusting the power of frequency stabilization light; the second half-wave plate is used for adjusting the power ratio of pump light to probe light; a first quarter-wave plate, a second quarter-wave plate, an atomic gas chamber and a photoelectric detector; after the output of the laser is isolated by the optical isolator, the first half-wave plate and the first polarization splitting prism are matched to adjust the frequency stabilization total beam power to about 5mW; the pump light is modulated by the electro-optical modulator, the probe light and the pump light reversely interact in the atomic gas chamber in an anti-phase circular polarization state, and the signal-to-noise ratio of a modulation transfer signal and the stability of a frequency stabilization system are remarkably improved.

The utility model relates to a 1.6 T silicon light engine, a modulation light source is arranged in a silicon light chip, the surface of the silicon light chip, which is provided with a copper convex column, is inversely pasted on a PCB (Printed Circuit Board), the PCB is provided with a clearance groove in an area below a light emitting waveguide of the silicon light chip, a ceramic heat sink is fixed on the silicon light chip, one end of the ceramic heat sink extends to the upper part of the clearance groove, and the other end of the ceramic heat sink extends to the lower part of the clearance groove. An array silicon lens and an optical fiber array which are fixed to the ceramic heat sink are sequentially arranged in the receding groove in the light propagation direction, the array silicon lens is coupled with a light outlet waveguide of the silicon optical chip, and an optical isolator fixed to the ceramic heat sink or the optical fiber array is coupled between the array silicon lens and the optical fiber array. The 1.6 T silicon light engine has the advantages that the silicon light chip with a built-in modulation light source is selected, coupling of an external light source is not needed, the 1.6 T silicon light engine assembled through the structure can reduce one-time high-frequency bonding pad switching, shorten the length of an RF circuit and greatly improve the high-frequency electrical performance, in addition, optical elements are all arranged on the ceramic heat sink, the light path is stable and reliable, and the cost is low.

The invention discloses an OPGW optical cable lightning stroke positioning monitoring system and monitoring method based on distributed optical fiber sensing. Comprising a DFB laser, a first optical coupler, an acoustic optical modulator, a pulse signal generator, a scrambler, a first EDFA optical amplifier, a first optical isolator, an optical circulator, an FBG filter, an OPGW sensing optical cable, an electro-optical modulator, a microwave signal generator, a polarization regulator, a second EDFA optical amplifier, a second optical isolator, a second optical coupler and a variable optical attenuator which are connected in sequence. A third optical coupler, a balance detector, a low-frequency amplifier and a data processing module. The system can quickly and accurately position the lightning stroke position of the OPGW optical cable by measuring the Brillouin scattering frequency shift and the vibration state of the scattering signal.

A semiconductor laser and a photonic nonlinear circuit chip are integrated together. The nonlinear circuit chip may include a nonlinear waveguide configured or controlled to enable sum-frequency generation, difference-frequency generation, second-harmonic generation, parametric amplification, or other nonlinear processes. Coupling between the semiconductor laser and the nonlinear circuit may be optimized by mode-matching, while back-reflections are minimized by diverting the reflections so that optical isolators are not needed. The integration of the semiconductor laser and the nonlinear photonic circuit chip enables nonlinear optical processing using a compact and scalable platform in a flexible manner that is compatible with different types of semiconductor lasers and different operation regimes. An additional input is provided so users can input an optical signal into the photonic chip for processing therein. In some examples, the photonic chip is configured with pump resonators, such as racetrack resonators. Method and device examples are described herein.

The embodiment of the utility model discloses an optical device and near-to-eye display equipment, the optical device comprises a projection light source, an optical isolator and a diffraction optical waveguide, the projection light source is used for emitting image light; the diffractive optical waveguide comprises a coupling grating; image light emitted by the projection light source passes through the optical isolator and then enters the coupling-in grating, and after being diffracted by the coupling-in grating, the image light returns to the optical isolator and cannot return to the projection light source. According to the technical scheme disclosed by the invention, the light rays diffracted and returned by the coupled grating can be prevented from entering the projection light source to form a ghosting image.

The invention discloses a green laser assembly, an optical module and application of the green laser assembly in photovoltaic assembly processing, a shell is provided with a first fixed reflector coated with a reflecting film for reflecting 1064nm, a first acousto-optic Q switch and a second acousto-optic Q switch are orthogonally arranged, an Nd: YAG laser uses an Nd: YAG crystal rod with the diameter of 6mm and the length of 166mm, and a second fixed reflector coated with a reflecting film for reflecting 1064nm is arranged on the Nd: YAG crystal rod. The first dichroscope transmits 1064nm and reflects 532nm to improve the conversion efficiency of frequency multiplication, the LBO crystal 16 is placed close to the second dichroscope to improve the power density and the conversion efficiency, and the second dichroscope reflects 1064nm and transmits 532nm. And the light with the wavelength of 532nm transmitted by the second dichroscope is coupled into an input end optical fiber of the optical fiber beam splitter after passing through the optical isolator and the first lens. The short-wavelength green laser is adopted, the photovoltaic welding strip is mainly composed of the copper base material and the tin alloy, the green laser absorptivity is far larger than the near-infrared wavelength (about 1 micron) absorptivity, and the laser absorptivity of the welding strip is remarkably improved.

The invention discloses an optical isolator and an optical path system thereof. The optical isolator comprises a first uniaxial crystal, a second uniaxial crystal and a third uniaxial crystal which are connected in sequence, wherein a Faraday rotating piece and a magnetic ring are respectively arranged between the first uniaxial crystal and the second uniaxial crystal and between the second uniaxial crystal and the third uniaxial crystal, and the magnetic ring provides an environmental magnetic field for the Faraday rotating piece; the second uniaxial crystal is provided with a plurality of half-wave plates, and the o light and the e light are combined through the half-wave plates, the Faraday rotating plate and the third uniaxial crystal, so that an optical signal can pass through in the forward direction with low loss; one surface of the second uniaxial crystal is provided with an absorption film, and the absorption film absorbs e light signals which are reversely transmitted and deflected to realize an isolation effect. The optical isolator has the advantages of being simple in optical path structure, low in loss and high in isolation degree.

The invention discloses a multi-wavelength laser based on an MEMS galvanometer, a multi-gas laser detector and a detection method. The multi-wavelength laser comprises a laser tube shell, N laser chips, a light path assembly and the MEMS galvanometer, wherein the N laser chips, the light path assembly and the MEMS galvanometer are arranged in the laser tube shell; the optical path assembly comprises N lens groups and N optical isolators; the N laser chips are distributed in the laser tube shell in an array mode, and laser emitted by each laser chip is collimated by one lens group and stabilized by one optical isolator, and then is input into the MEMS galvanometer; and the MEMS galvanometer selectively outputs the laser with different optical axes as a detection light beam for measuring different gas components. The multi-gas laser detector comprises a multi-wavelength laser based on the MEMS galvanometer, a photoelectric detector, a laser driving unit, a signal conditioning unit and a controller. The device is simple in structure, small in size, low in power consumption and capable of achieving multi-component atmospheric environment gas detection.

An optical isolator for generally collimated laser radiation includes a single polarizing element, at least one Faraday optical element, at least one reciprocal polarization altering optical element disposed at the single polarizing element, at least one reflective optical element for reflecting radiation to provide an even number of passes through the at least one Faraday optical element, and a magnetic structure. The magnetic structure is capable of generating a magnetic field within the at least one Faraday optical element that is generally aligned with the even number of passes along a beam propagation axis. The optical isolator is configured to receive generally collimated laser radiation, which passes through the single polarizing element and the at least one reciprocal polarization altering optical element and which makes at least two passes through the at least one Faraday optical element, whereby generally collimated laser radiation is output from the optical isolator.

The invention discloses a two-degree-of-freedom displacement simultaneous measurement system and method based on an orbital angular momentum beam interferometer. The system comprises a laser; the light field regulation and control module is used for converting the linearly polarized light into a light beam with orbital angular momentum; an optical isolator; a first beam splitter; a second beam splitter; the third beam splitter is used for combining the first reference light beam and the first measurement light beam to generate conjugate interference; a fourth beam splitter; a fifth beam splitter; the sixth beam splitter is used for combining the second reference light beam and the second measurement light beam to generate conjugate interference; a seventh beam splitter; a first reflector; a second reflector; a third reflector; a first Weive prism; a second Weive prism; a reflection grating; and the image acquisition and processing module is used for acquiring a petal-shaped interference pattern formed by conjugate interference. The system is compact in structure and high in demodulation sensitivity, and can realize non-contact and high-resolution synchronous two-degree-of-freedom measurement.

The invention relates to the technical field of spontaneous emission light sources, in particular to an integrated amplified spontaneous emission light source based on an erbium-doped waveguide, which comprises a pump laser, a wavelength division multiplexer, the erbium-doped waveguide, a waveguide reflecting region, a waveguide optical isolator and a waveguide filter, and is characterized in that the wavelength division multiplexer is provided with an input end, a first output end and a second output end; the pump laser is connected with the input end of the wavelength division multiplexer, the second output end of the wavelength division multiplexer is connected with the waveguide reflection area, the first output end of the wavelength division multiplexer is connected to the input end of the erbium-doped waveguide, the output end of the erbium-doped waveguide is connected to the input end of the waveguide optical isolator, and the output end of the waveguide optical isolator is connected with the waveguide filter; the size of the light source is greatly reduced through the integrated waveguide design, and the performance of the light source is guaranteed under the condition that the size of the light source is greatly reduced.

The utility model provides a coaxially packaged VOA + ISO function integrated device, which comprises a pin assembly, a polarization assembly, a collimating lens, an optical rotation assembly and a rotating mirror chip, the pin assembly emits optical signals, and the polarization assembly, the collimating lens, the optical rotation assembly and the rotating mirror chip are sequentially arranged along an optical path; the polarization assembly is arranged at one end, facing the collimating lens, of the pin assembly, and the optical rotation assembly is arranged at one end, facing the rotating mirror chip, of the collimating lens; by adjusting the angle of the rotating mirror chip, optical signals emitted by the pin assembly are reflected back to the pin assembly at different angles, so that the receiving area of the pin assembly for the optical signals is adjusted, and power attenuation adjustment of the optical signals is further achieved. The polarization assembly and the optical rotation assembly are used for isolating interference light input by the pin assembly from the outside; through the above structure, the function of the optical isolator and the function of the adjustable attenuator are integrated in the same device, compared with a single discrete device, the size is smaller and more compact, and more spatial layout requirements can be met.

The present invention provides a more compact optical isolator.　An optical isolator 1 is characterized by comprising: a magnet 7 having a through-hole 7a through which light is incident and passes in the forward direction; a Faraday element 2 that transmits light and is disposed inside the through-hole 7a of the magnet 7; a first polarizer 3 that is disposed on the incident side of the magnet 7, the incident side being a side on which light is incident in the forward direction; a second polarizer 4 that is disposed on the emission side of the magnet 7, the emission side being a side to which light is emitted in the forward direction; a first polarizer holder 5 storing the first polarizer 3; and a second polarizer holder 6 storing the second polarizer 4, the area of the first polarizer holder 5 being smaller than the area of the magnet 7 when viewed from the forward direction, the area of the second polarizer holder 6 being smaller than the area of the magnet 7 when viewed from the forward direction.

The invention relates to the technical field of optical fiber sensing and optical communication, and discloses a tunable semiconductor laser wavelength tuning system based on photoelectric feedback, which comprises a user control module, a modulation grating Y laser, a user application optical path, an optical splitter, an optical isolator, a photoelectric conversion circuit, a negative feedback amplification circuit and an adjustable current source circuit, and output light of the modulation grating Y laser passes through the optical splitter, one part of the output light enters the optical isolator and then enters the user application light path, and the other part of the output light enters the photoelectric conversion circuit and is input into the negative feedback amplification circuit, so that the adjustable current source circuit is controlled, SOA current is controlled to be output to the modulation grating Y laser, and the output light power is changed. In the calibration and normal working process of the modulation grating Y laser, the optical power output by the laser is collected in real time through the optical splitter, negative feedback is formed at the SOA current, and only the left current, the right current and the phase current need to be input, and the proper SOA current is automatically matched for power compensation.