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Narrow linewidth laser technology and progress

Narrow linewidth laser technology and progress

This paper first introduces the application requirements and architecture evolution of narrow linewidth lasers, and then introduces the research progress of the main cavity laser and the fixed external cavity feedback laser. Then, the newly developed adaptive distributed feedback narrow linewidth lasers are introduced, and the physical ideas, core devices and system performance of this new type of lasers are analyzed and discussed. Finally, the potential applications of narrow linewidth lasers are introduced with distributed optical fiber sensing, laser coherent communication and on-chip optical information processing as typical application fields, and the development prospects and future trends of narrow linewidth lasers are prospected.

2023-12-14

An article to understand the principle of polarization-maintaining fiber, fast and slow axis, polarization-maintaining beat length, extinction ratio

An article to understand the principle of polarization-maintaining fiber, fast and slow axis, polarization-maintaining beat length, extinction ratio

Theoretically, a fiber with a circular core should not produce birefringence, and the polarization state of the fiber will not change during propagation. However, in practice, regular the optical fiber in the production process, will be subjected to external force and other reasons, so that the thickness of the optical fiber is not uniform or bending, etc., it will cause the phenomenon of birefringence. When the fiber is subjected to any external interference, such as wavelength, bending, temperature, etc., the polarization state of light will become chaotic when transmitted in the regular fiber.

2023-12-14

Advantages and Significance of Thin Film Lithium Niobate in Integrated Microwave Photonic Technology

Advantages and Significance of Thin Film Lithium Niobate in Integrated Microwave Photonic Technology

With the advantages of large bandwidth, strong parallel processing ability and low transmission loss, microwave photonic technology has the potential to break the technical bottleneck of traditional microwave systems and improve the performance of military electronic information equipment such as radar, electronic warfare, communications, measurement and control. The microwave photonic system constructed by discrete devices has the problems of large volume, heavy weight and poor stability, which seriously restrict the application of microwave photonic technology in spaceborne and airborne platforms. Therefore, the integrated microwave photonic technology is becoming an important support to break the application of microwave photons in military electronic information systems and give full play to the advantages of microwave photonic technology.

2023-12-14

ST, SC, FC fiber optic connector diagram

ST, SC, FC fiber optic connector diagram

Fiber optic connectors, that is, fiber optic connectors for accessing optical modules, also have many kinds, and they cannot be interused with each other. People who do not often touch optical fibers may mistakenly think that the optical fiber connectors of GBIC and SFP modules are the same, but they are not. The SFP module is connected to the LC fiber optic connector, while the GBIC is connected to the SC fiber optic connector.

2023-12-14

SOA Optical Amplifier: An article to quickly let you know about semiconductor optical amplifiers

SOA Optical Amplifier: An article to quickly let you know about semiconductor optical amplifiers

A semiconductor optical amplifier is an optical amplifier based on a semiconductor gain medium. It is essentially like a fiber-coupled semiconductor laser tube, the end mirror has been replaced by an AR coating; a tilted waveguide can be used to further reduce the end reflectivity. The signal light is typically transmitted through a semiconductor single-mode waveguide with lateral dimensions of 1-2 μm and a length of about 0.5-2mm. The waveguide mode has significant overlap with the active (amplified) region, which is pumped by the current. The injection current generates a certain carrier density in the conduction band, allowing an optical transition from the conduction band to the valence band. The gain maximum occurs at photon energies slightly above the bandgap energy.

2023-12-14

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