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Heavy release-the first domestic 110GHz electro-optic modulator successfully developed [reprinted]]

Heavy release-the first domestic 110GHz electro-optic modulator successfully developed [reprinted]]

Recently, the first domestic 110GHz electro-optical intensity modulator product was successfully developed in the National Information Optoelectronics Innovation Center (NOEIC), and was verified and ordered by many industrial customers. The modulator takes the domestic thin film lithium niobate chip as the core and can work in C and L bands. It has the characteristics of ultra-high bandwidth, ultra-high speed, low chirp, low driving voltage, high linearity and so on. Its 3dB bandwidth is as high as 110GHz. It is the first electro-optic modulator product with a bandwidth exceeding 110GHz in China. Its key technical indicators have reached the international advanced level, it will be widely used in optical communication, optical interconnection, optical computing, photoelectric measurement, microwave photonics and other broadband optoelectronic information systems.

2023-12-14

Who has mastered the DFB laser dominance? China DFB laser layout analysis!

Who has mastered the DFB laser dominance? China DFB laser layout analysis!

In recent years, with the widespread deployment of 5G, global traffic has grown rapidly and bandwidth has been rapidly improved. At the same time, the outbreak of the new coronary pneumonia epidemic has prompted a sharp increase in demand for data centers and fiber-to-the-home, bringing considerable demand to the optical communications industry. The market demand for optical modules, wavelength division devices, splitters and connectors continues to grow, and fixed networks and access networks have also ushered in a new construction cycle. The optical module is a key component of the optical communication equipment, and the optical communication device is the main component of the optical module, and its performance determines the upgrade and update of the optical communication network, and the laser is the most important electro-optical conversion device in the optical module. With the rapid development and breakthrough of semiconductor laser technology, semiconductor lasers have a series of advantages such as small size, light weight, high electro-optic conversion efficiency, strong stability, high reliability and long life. At present, the quality, wavelength range and output power of semiconductor laser products are rapidly improving, and the variety of products is becoming more and more abundant. The application of semiconductor lasers has covered the entire field of optoelectronics and has become one of the core technologies of optoelectronic science today. Therefore, semiconductor lasers are considered to be one of the most promising areas in the optoelectronic industry.

2023-12-14

Huawei applies for a patent on an electro-optic modulator to achieve good impedance matching to improve the efficiency and bandwidth of electro-optic modulation.

Huawei applies for a patent on an electro-optic modulator to achieve good impedance matching to improve the efficiency and bandwidth of electro-optic modulation.

According to the announcement of the State Intellectual Property Office, Huawei Technologies Co., Ltd. applied for a project called "an electro-optic modulator and related equipment", the public number is CN117170122A, and the application date is May 2022.

2023-12-14

North Institute of Technology has made new progress in the dark current suppression technology of infrared photodetectors.

North Institute of Technology has made new progress in the dark current suppression technology of infrared photodetectors.

Infrared photodetectors are widely used in gas sensing, meteorological remote sensing and space exploration. However, at present, traditional infrared detection materials are mainly based on indium telluride, indium gallium arsenic, mercury cadmium telluride, etc., which need to be grown by molecular beam epitaxy, and complex processes such as flip-chip bonding and coupling with readout circuits. Although the detection performance is high, it is limited by cost and yield.

2023-12-14

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

The Chinese delegation's OTN/50G PON/FTTR and other technologies achieved milestone progress at the ITU-T SG15 plenary session.

The Chinese delegation's OTN/50G PON/FTTR and other technologies achieved milestone progress at the ITU-T SG15 plenary session.

12/13/2023, Optical Fiber Online News, November 20-December 1, 2023, the third plenary session of the 2022-2024 research period of Study Group 15 (SG15) of the International Telecommunication Union Standardization Sector (ITU-T) was held in Geneva, Switzerland. A total of 230 representatives from 17 national members, 38 sector members and 13 sector associate members attended the meeting. A total of nearly 70 experts from 12 member units of the Chinese delegation attended the meeting on the spot and submitted 148 technical proposals, which promoted the deliberation, approval and adoption of 25 standard suggestions and 4 technical supplement documents with Chinese experts as editors. Among the 45 new proposals, china's 32 experts served as editors of 3 new standard recommendations, 18 existing standard recommendations and 6 technical additions.

2020-10-14

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