Xem 1-20 trên 26 kết quả Fiber lasers
  • Optical fibers, an important and promising material, have been the subject of intensive research and development due to their many scientific and practical applications. They are designed to guide light along its length by confining as much light as possible in its core. The interaction between the propagating light with the fiber material is the foundation of the development of various applications such as optical amplifiers, fiber lasers, sensors etc.

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  • This book is entitled to laser welding processes. The objective is to introduce relatively established methodologies and techniques which have been studied, developed and applied either in industries or researches. State-of-the art developments aimed at improving or next generation technologies will be presented covering topics such as monitoring, modelling, control, and industrial application.

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  • Tham khảo sách 'selected topics on optical fiber technology_1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Most of the material in this volume is new. The first three chapters deal with three important fiber-optic components--fiber-based gratings, couplers, and interferometers--that serve as the building blocks of lightwave technology. In view of the enormous impact of rare-earth-doped fibers, amplifiers and lasers made by using such fibers are covered in Chapters 4 and 5. The last three chapters describe important applications of nonlinear fiber optics and are devoted to pulse-compression techniques, fiber-optic communication systems, and soliton-based transmission schemes....

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  • Research activities in laser physics and in photonics technologies over the last two decades have continuously produced a large diversity of new advances. Several examples illustrate the major impact of optics in the quantum sciences, engineering, metrology, communication fiber networks, or high-capacity data storage. Besides these established fields of research and development for industry or for the consumer markets, laser optics will certainly disseminate in the near future in new areas such as biology, chemistry, medicine, or nanotechnologies.

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  • In 2009 the world celebrated 50 years of lasers, bringing to the attention of the public how deeply lasers and laser related technologies have revolutionized both science and everyday life. Next year will be the fiftieth anniversary of the semiconductor laser. Used as a compact light source with high modulation rates, it transformed telecommunications in combination with glass fibers. Today laser diodes are omnipresent in data storage and communication. Still, most of these applications are based on infrared or red laser diodes.

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  • Semiconductor lasers are among the most important optoelectronics devices. Remarkable development has been accomplished in the three decades since the first achievement in room-temperature continuous oscillation, which opened the possibility of practical applications of semiconductor lasers. Today, various types of semiconductor lasers are mass-produced and widely used as coherent light sources for a variety of applications, including optical fiber communication systems and optical disk memory systems....

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  • Misalign- ment will lead to non-regular channels and thereforemay interfere with the bonding technique; in severe cases, it may lead to the destruction of the complete device. A correct alignment will lead to only small deviations fromthe desired elliptical shape, and the distortion while the bonding process takes place will be minimum. Align- ment techniques used to avoid errors can be simplemechanicalmethods (e.g. use of alignment pins), edge catches in a specially designed assembling device or optical methods such as laser alignment.

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  • KỸ THUẬT RADIO OVER FIBER AMC AMPS AP BB BPF BPSK Adaptation Modulation and Coding Advanced Mobile Phone Service Access Point Base Band Band Pass Filter Binary Phase Shift Keying Broadband Wireless Access BWAN CDMA CS CSPDN DFB DMOD Network Code division Multiple Access Central Station Circuit Switched Data Network Distributed Feed Back(laser) DeMODdulator Đa truy cập phân chia theo mã Trạm trung tâm Mạng chuyển mạch dữ liệu Laser hồi tiếp phân tán Bộ giải điều chế Bộ điều chế và mã hoá Dịch vụ di động tiên tiến Điểm truy cập Bă...

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  • RF refence Refenrence laser RF refence Signal laser Optical mod IF mod BS Photodetector CS Digital source Hình 1.5 Kỹ thuật Heterodyne trong mạng RoF. Như ở hình vẽ 2.6 ta thấy 2 ưu điểm của kỹ thuật này. Ưu điểm thứ nhất đó là cấu trúc BS đơn giản do nguồn tham chiếu RF được tạo ra từ CS, nguồn RF tham chiếu được khóa pha với Laser phát chính (master laser). Cả nguồn tham chiều lẫn tín hiệu được truyền đi trong cùng sợi quang.

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  • 1.9.1 3.2.2 Các thành phần của hệ thống B0: Bộ lọc quang độ rộng B0. DMOD: Bộ giải điều chế. DFB LD: Laser DFB. EDFA: Bộ khuếch đại quang sợi. MOD: Bộ điều chế. MZM: Bộ điều chế Mach-Zehnder. PD: Photodiode tách sóng PSK: Phương pháp điều chế số PSK khóa dịch pha. 1.9.2 3.2.3 Hoạt động của hệ thống Trên tuyến downlink: DFB laser dùng để cung cấp nguồn ngoài cho 2 bộ điều chế dual-Mach-Zehnder (gồm 4 bộ điều chế Mach Zehnder) bởi 1 coupler 3dB.

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  • tác động của tán sắc, suy vào và nhiễu pha trên thành phần của sợi quang sẽ làm giảm SNR đi một lượng so với ở điểm phát là: với Δv là bề rộng 3dB ngõ ra của laser, D là tán sắc của sợi quang, Lf là suy hao. Mặc khác, giả sử nhiễu pha có phân bố Guassian thì variance của nó là: với Bn là băng thông nhiễu tương đương của bộ thu sóng mm. Sau khi giải điều chế BPSK thì BER của tín hiệu sẽ là: với CNRx là CNR của tín hiệu tại đầu thu bao gồm...

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  • Although inelastic scattering of light from molecules, a phenomenon now known as Raman scattering, was observed by C. V. Raman in 1928, the nonlinear phenomenon of stimulated Raman scattering was not demonstrated until 1962. Soon after low-loss silica fibers became available around 1970, Roger Stolen and coworkers used stimulated Raman scattering in such fibers not only for amplification of optical signals but also for constructing fiber-based Raman lasers.

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  • The dramatic reduction in transmission loss of optical fibers coupled with very important developments in the area of light sources and detectors have resulted in phenomenal growth of the fiber optic industry during the last 35 years or so. Indeed, the birth of optical fiber communication systems coincided with the fabrication of low-loss optical fibers and the operation of room-temperature semiconductor lasers in 1970. Since then, scientific and technological growth in this field has been phenomenal.

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  • Tham khảo tài liệu 'adc krone - guide - fo - laser optimized fiber better in price, bandwidth, and distance', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The field of photonics is enormously broad, covering everything from light sources to geometric and wave optics to fiber optics. Laser and light source technology is a subset of photonics whose importance is often underestimated. This book focuses on these technologies with a good degree of depth, without attempting to be overly broad and all-inclusive of various photonics concepts. For example, fiber optics is largely omitted in this book except when relevant, such as when fiber amplifiers are examined.

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  • Tham khảo tài liệu 'adc krone - guide - om-3 laser optimized fiber protect investment', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • ADC’s micro cables provide factory standard guaranteed performance specifications. They are 100% optically tested and are offered with a variety of optical performance levels. Features: • Extremely light weight • Extremely small outer diameter • Easily terminate to industry standard connectors • Wide variety of materials to suit your specific requirements Applications: • Patch cords and pigtails • Small conduit • LASER modules for telephony applications

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  • Laser-Optimized Fiber: Built for Price, Bandwidth, and Distance to Make the Most of Your Investment Over the past 25 years, Ethernet standards have evolved from 10 Mbps and 100 Mbps to Gigabit and now 10 Gigabit. The rapid growth of Internet use and bandwidth-intensive applications combined with routine transmission of large files is driving the need for 10 Gigabit Ethernet (10GbE) in many network backbone and data center connections. Implementation is happening all around us. Sales of 10GbE switch ports are increasing dramatically, and will continue to grow over the next decade.

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  • Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance.

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