Natural polarization state single wavelength light source and method

A single-wavelength, polarization technology, applied to the field of optics, can solve the problems of low efficiency of superluminescent light-emitting diodes, low coupling efficiency of single-mode fiber, unfavorable applications, etc., and achieve the effect of simple structure, high gain and power, and convenient realization.

Inactive Publication Date: 2012-12-26
常州奥镭光电科技有限公司
5 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0019] Superluminescent light-emitting diodes (SLD/SLED) have low efficiency, poor stability, low coupling efficiency with single-mode fiber, and, like f...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Method used

As shown in Figure 5, a kind of improved method is to connect a semiconductor optical amplifier [4] with current drive at the output end of polarization-independent optical isolator [3] to realize higher output power, and can simultaneously Guaranteed single-wavelength natural polarization characteristics.
Semiconductor optical amplifier [1] produces broadband, polarization-independent spontaneous radiation under current drive; Forward spontaneous radiation is directly output through polarization-independent optical isolator [3]; Backward spontaneous radiation passes through fiber grating [2] , the fiber grating [2] filters and reflects narrow-band wavelengths, and the light in other bands is transmitted and dissipated from the other end; the light reflected by the fiber grating [2] i...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention discloses a natural polarization state single wavelength light source and a method. The light source consists of a first semi-conductor light amplifier with a current pump, a fiber grating and a polarization independent isolator, wherein the fiber grating is connected to one end of the first semi-conductor light amplifier; the reflection wavelength of the fiber grating is in the gain spectrum of the first semi-conductor light amplifier; and the other end of the first semi-conductor light amplifier is connected to the input end of the polarization independent isolator. The method has the following steps that: generating spontaneous radiation by the first semi-conductor light amplifier driven by the current; directly outputting forward spontaneous radiation light through the polarization independent isolator; filtering the backward spontaneous radiation light through the fiber grating and reflecting spontaneous radiation light with narrow-band wavelength; outputting and consuming the spontaneous radiation light of other wavebands from the other end of the fiber grating after the spontaneous radiation light of other wavebands being transmitted; and outputting the spontaneous radiation light reflected by the fiber grating from the polarization independent isolator after being amplified by the first semi-conductor light amplifier again. According to the natural polarization state single wavelength light source and the method, the single wavelength natural polarization light can be directly output, so that the energy conversion efficiency is high; and the natural polarization state single wavelength light source and the method disclosed by the invention are convenient to realize and simple in structure.

Application Domain

Laser details

Technology Topic

Wave bandNarrow band +9

Image

  • Natural polarization state single wavelength light source and method
  • Natural polarization state single wavelength light source and method
  • Natural polarization state single wavelength light source and method

Examples

  • Experimental program(1)

Example Embodiment

[0050] Such as Figure 4 As shown, a single-wavelength natural polarization light source of the present invention is composed of a current-pumped semiconductor optical amplifier (SOA) [1], a fiber grating [2] and a polarization-independent isolator [3].
[0051] The semiconductor amplifier is used to amplify the random distribution of the polarization direction of the spontaneous radiation (ASE) to produce natural polarized light, and the fiber grating [2] reflects the back-output light of the spontaneous radiation back to the SOA [1] to narrow the output spectral width and use its The feedback increases the power of this wavelength, and the polarization-independent isolator [3] prevents the end face of the fiber output end from reflecting to form laser oscillation, ensuring the output of a natural polarization light source independent of polarization.
[0052] A piece of fiber grating [2] is connected to one end of a semiconductor optical amplifier (SOA) [1], the reflection wavelength of the fiber grating [2] is within the gain spectrum of SOA[1]; the other end of SOA[1] is independent of polarization The input terminal of the isolator [3] is connected.
[0053] The semiconductor optical amplifier [1] generates broadband, polarization-independent spontaneous radiation under current drive; the forward spontaneous radiation is output directly through the polarization-independent optical isolator [3]; the backward spontaneous radiation passes through the fiber grating [2], fiber grating [2] Filtering and reflecting narrow-band wavelengths, the light of other bands is transmitted and dissipated from the other end of the output; the light reflected by the fiber grating [2] is amplified again by SOA [1] and then output from the polarization-independent isolator [3]. The spontaneous radiation reflected by the fiber grating [2] is amplified in SOA [1], which not only increases the output optical power but also suppresses the spontaneous radiation of other wavelengths, and narrows the spectrum.
[0054] Such as Figure 5 As shown, an improved method is to connect a current-driven semiconductor optical amplifier [4] to the output end of the polarization-independent optical isolator [3] to achieve higher output power and at the same time ensure the single-wavelength natural polarization characteristics .
[0055] Image 6 It is the spectrum of the broadband ASE fiber light source and the new natural polarization single-wavelength light source without amplifier, wherein the output bandwidth of the ASE fiber light source is greater than 30nm, the bandwidth of the new natural polarization single-wavelength light source is less than 1nm, and the output power is 6.0mW. It can be seen from the figure that the light of the reflected wavelength of the fiber grating obtains a large gain, while also suppressing the light of other wavelengths.
[0056] Figure 7 For the details of the output spectrum of the new light source of the present invention, it can be seen that the sideband suppression ratio is greater than 30dB. The reflection spectrum width of the fiber grating is less than 1nm, and the center wavelength is 1544nm.
[0057] Use erbium-doped fiber amplifier (EDFA) [5, 6] to replace the semiconductor optical amplifier [1, 4] in the above technical scheme. Take the improvement plan as an example, its structure is as Figure 8 :
[0058] A section of fiber grating [2] is connected to one end of an erbium-doped fiber amplifier (EDFA) [5], the reflection wavelength of the fiber grating [2] is within the gain spectrum of EDFA [5]; the other end of EDFA [5] is connected to the polarization The input terminal of the independent isolator [3] is connected; the output terminal of the polarization independent isolator [3] is connected with an EDFA [6].
[0059] Among them, EDFA [5, 6] consists of a semiconductor laser [7], a wavelength division multiplexer [8] and a section of erbium-doped gain fiber [9]. Its structure is like Picture 9 :
[0060] A semiconductor laser [7] provides pump light through a wavelength division multiplexer [8] as the input pump light; the wavelength division multiplexer [8] is connected to a section of rare earth doped gain fiber [9].
[0061] In the improved scheme, a narrow-band filter [10] is added to the output of the polarization-independent isolator [3], and the fiber grating [2] is removed. Its structure is as Picture 10 :
[0062] An SOA[1] is connected to the input of a polarization-independent isolator [3]; the output of the polarization-independent isolator [3] is connected to the input of a narrow-band filter [10]; the output of the narrow-band filter [10] The end is connected with an SOA[4].
[0063] The forward spontaneous radiation generated in SOA[1] passes through the polarization-independent isolator [3] and then enters the narrowband filter [10]; the narrowband wavelength transmitted by the narrowband filter [10] is amplified in SOA[4] After output. The above schemes all realize the high power output of single wavelength natural polarization state through the single feedback of fiber grating to the ASE light field.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

High-efficient rectification antenna based on microwave RFID frequency range low-power input

InactiveCN106229611AImprove energy conversion efficiencyHigh frequencyAntenna supports/mountingsPhysicsInterface point
Owner:SUN YAT SEN UNIV +1

Brushless Motor and System Thereof

InactiveUS20170047834A1Risk be eliminate and substantially reduceImprove energy conversion efficiencyAssociation with control/drive circuitsSalient polesControl systemBrushless motors
Owner:FOSTER ASSETS CORPORATION

Near-shore wave energy generating system and method based on hydraulic ram pumps

ActiveCN107228042AImprove energy conversion efficiencyStable power generationHydro energy generationMachines/enginesHydraulic ramWater pipe
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES

Single-excitation rotary ultrasonic motor

InactiveCN103208943ALarge power capacityImprove energy conversion efficiencyPiezoelectric/electrostriction/magnetostriction machinesFriction driveEngineering
Owner:SUZHOU UNIV OF SCI & TECH

Syringe-microinjection-type infusion device based on shape memory alloy driven and method thereof

InactiveCN103316398AImprove energy conversion efficiencySave energyFlow monitorsSyringeEngineering
Owner:ZHEJIANG UNIV

Classification and recommendation of technical efficacy words

  • Easy to implement
  • Improve energy conversion efficiency
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap