terrestrial coherent free space optical communication systems

... Advanced Modulation Formats in Coherent Optical Communication Systems Chapter Introduction 1.1 Background Optical communication systems refer to communication systems that use carriers of high ... Formats in Coherent Optical Communication Systems Abstract Recently, advanced modulation formats with digital coherent detection have attracted extensive attention in coherent optical communications, ... coherent detection systems Several commonly-used DSP algorithms in the receiver are reviewed in the other parts 1.2.1 Coherent Detection Systems Coherent optical communication systems started to...

Ngày tải lên: 09/09/2015, 10:15

... Introduction Fiber-optic communication systems are lightwave systems that employ optical fibers for information transmission The carrier frequencies for optical communication systems are in the range ... followed by the motivation and outline of this thesis 1.1 Review of Coherent Optical Communication The coherent optical communication systems draw considerable attention and were intensively investigated ... dramatically im- 1.1 Review of Coherent Optical Communication proves the receiver sensitivity and transmission distance tolerance of the optical communication system [4] The optical phase lock loop...

Ngày tải lên: 12/09/2015, 09:28

... intelligent optical backplane for parallel computing and communications,” Applied Optics, vol 35, no 8, pp 1253–1268, 1996 [4] R Gil Otero, C J Moir, T Lim, G A Russell, and J F Snowdon, Free- space optical ... two stages of a freespace OH A number of designs for OHs have been suggested and built [2, 4, 5] However in order to minimize the optical losses and reduce the number of different optical components, ... the optical quality can be increased in order to increase the maximum number of optical stages that the optical signal can go through in the system EXPERIMENTAL SETUP In order to analyze the optical...

Ngày tải lên: 22/06/2014, 22:20

... NOLM Nonlinear Optical Loop Mirror NRZ Non-Return-to-Zero OADM Optical Add/Drop Multiplexer OBPF Optical Band-pass Filter ODI Optical Delay Interferometer OEO Optical- Electrical -Optical OOK On-Off ... the optical signal passes the cascaded optical amplifers The power ratio between optical signal and optical noise is called as optical signal to noise ratio (OSNR), which is a key parameter in optical ... the physical layer of optical fiber transmission systems [1] Optical performance monitoring (OPM) offers a great assistance to optical impairment management in transmission systems, which is potential...

Ngày tải lên: 09/09/2015, 08:17

... Wireless Optical Communication Systems This page intentionally left blank WIRELESS OPTICAL COMMUNICATION SYSTEMS STEVE HRANILOVIC Assistant Professor Department ... Brief History of Wireless Optical Communications Figure 1.1 An indoor wireless optical communication system Figure 1.1 presents a diagram of a typical indoor wireless optical communications scenario ... 39 39 47 51 64 viii WIRELESS OPTICAL COMMUNICATION SYSTEMS Part II Signalling Design OPTICAL INTENSITY SIGNAL SPACE MODEL 4.1 Signal Space of Optical Intensity Signals 4.2 Examples 4.3 Conclusions...

Ngày tải lên: 23/10/2015, 20:19

... support optical communication In the specific area of measurement technology of optical fiber sensor and communication systems, great demands are needed in the market For example, in optical communication ... world is becoming a truly global village after implementing optic fiber in optical communication systems These telecommunication links between the countries provide us low price, high speed and ... It supports all the global business, finance, market, and communication In parallel with the application of optical fiber communication, optical fiber has another main application, fiber optic...

Ngày tải lên: 10/09/2015, 08:41

... List of Publications 146 vi Summary Optical fiber plays a key role in both high-speed optical communication and sensor systems High-speed optical fiber transmission systems have been studied for several ... as a benefit of large bandwidth in optical transmission systems Besides transmission systems, optical fiber can also be utilized as a detector in fiber sensor systems Various parameters, such as ... characteristic Therefore, optical fiber sensors are applicable to various environments The performances of both high-speed optical transmission systems and optical sensor systems are affected by...

Ngày tải lên: 11/09/2015, 10:01

... Cellular Mobile Communication Systems 1.1.1 Analogue First Generation Cellular Systems 1.1.2 Digital Second Generation Cellular Systems 1.1.3 Third Generation Cellular Systems ... Cellular Mobile Communication Systems 1.1.1 Analogue First Generation Cellular Systems In the late of 1970s and early 1980s, various first generation (1G) cellular mobile communication systems were ... serial-to-parallel STBC space- time block coding STC space- time coding xiii STTC space- time trellis codes SVD Singular Value Decomposition TDMA time division multiple access TIA telecommunications industry...

Ngày tải lên: 16/09/2015, 15:54

... hiệu) Ví dụ, giả sử nguồn tạo chữ tiếng Anh (trong chương này, tham khảo chữ tiếng Anh A đến Z space (khoảng trắng), tổng cộng 27, ký hiệu), tất ký hiệu cung cấp với xác suất Trong trường hợp ... đặc biệt để khắc phục ảnh hưởng nhiễu Hai khía cạnh đưa Shannon báo “A Maththemathical Theroy of Communication xuất năm 1948 Bell System Technical Journal - nơi đưa lý thuyết thông tin Shannon ... định lý quan trọng cho kỹ sư truyền thông Tài liệu tham khảo C E Shannon "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol 27, 1948 Tất kỹ sư truyền thông phải đọc báo...

Ngày tải lên: 18/09/2012, 10:13

Ngày tải lên: 12/12/2013, 04:15

Ngày tải lên: 20/12/2013, 19:15

... of the resulting optical signal Most digital lightwave systems employ OOK in combination with PCM 1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ in ... systems In the case of unguided optical communication systems, the optical beam emitted by the transmitter spreads in space, similar to the spreading of microwaves However, unguided optical systems ... problem, of course, disappears in free- space communications above the earth atmosphere (e.g., intersatellite communications) Although free- space optical communication systems are needed for certain applications...

Ngày tải lên: 24/12/2013, 01:16

... much an optical pulse would broaden on propagation inside the fiber In some optical communication systems, the frequency spread ∆ω is determined by the range of wavelengths ∆λ emitted by the optical ... channel powers in optical communication systems are typically below 10 mW, SRS is not a limiting factor for single-channel lightwave systems However, it affects the performance of WDM systems considerably; ... of interest for optical communication systems Typical values of D are in the range 15–18 ps/(km-nm) near 1.55 µ m This wavelength region is of considerable interest for lightwave systems, since,...

Ngày tải lên: 24/12/2013, 01:16

... 1.0–1.65 µ m that includes the region 1.3–1.6 µ m important for optical communication systems The fabrication of semiconductor optical sources requires epitaxial growth of multiple layers on ... all 1.55-µ m optical communication systems operating at bit rates of 2.5 Gb/s or more DFB lasers are reliable enough that they have been used since 1992 in all transoceanic lightwave systems 3.4.2 ... not generally applicable to optical communication systems where the laser is typically biased close to threshold and modulated considerably above threshold to obtain optical pulses representing...

Ngày tải lên: 24/12/2013, 01:16

... are nonetheless useful for optical communication systems simply because of their higher sensitivity Receiver sensitivity is an important issue in the design of lightwave systems and is discussed ... in Optical Fiber Telecommunications I, S E Miller and A G Chynoweth, Eds., Academic Press, San Diego, CA, 1979, Chap 18 [3] R G Smith and S D Personick, in Semiconductor Devices for Optical Communications, ... [4] S R Forrest, in Optical Fiber Telecommunications II, S E Miller and I P Kaminow, Eds., Academic Press, San Diego, CA, 1988, Chap 14 [5] B L Kasper, in Optical Fiber Telecommunications II,...

Ngày tải lên: 24/12/2013, 01:16

... third-generation systems operating near 1.55 µ m and can exceed 100 (Tb/s)-km for the fourth-generation systems 5.1.2 Distribution Networks Many applications of optical communication systems require ... are detrimental mainly for coherent communication systems The performance of direct-detection lightwave systems is affected by intensity noise rather than phase noise Optical feedback can increase ... and then converts it back into optical form by modulating an optical source Fiber losses can also be compensated by using optical amplifiers, which amplify the optical bit stream directly without...

Ngày tải lên: 24/12/2013, 01:16

Ngày tải lên: 24/12/2013, 14:16

... Fiber Optic Communication Systems, 3rd Ed., Wiley, 2002 [10] B F Jorgensen, B Mikkelsen and C J Mahon, “Analysis of optical amplifier noise in coherent optical communication systems with optical ... phase-shift keying with coherent detection, and (d) quadratureamplitude modulation with coherent detection Key words: optical fiber communication; optical modulation; optical signal detection; ... analysis in [1] Modulation and Detection Techniques for DWDM Systems 17 COHERENT DETECTION OF PSK AND QAM In optical communications, coherent detection” has often been used to denote any detection...

Ngày tải lên: 20/01/2014, 06:20

... PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS This page intentionally left blank PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS By DON TORRIERI Springer eBook ISBN: ... Complex-Valued Quaternary Sequences 6.2 Systems with Random Spreading Sequences Direct-Sequence Systems with PSK Quadriphase Direct-Sequence Systems 6.3 Wideband Direct-Sequence Systems Multicarrier Direct-Sequence ... derivation of the fundamentals of spread-spectrum communication systems Although spread-spectrum communication is a staple topic in textbooks on digital communication, its treatment is usually cursory,...

Ngày tải lên: 20/01/2014, 06:20

... in optical communication systems, an optical amplifier should have Fn as low as possible 6.1.4 Amplifier Applications Optical amplifiers can serve several purposes in the design of fiber-optic communication ... applications of optical amplifiers are discussed in Chapter devoted to WDM lightwave systems CHAPTER OPTICAL AMPLIFIERS 232 Figure 6.3: Three possible applications of optical amplifiers in lightwave systems: ... issues for long-haul systems employing a cascaded chain of optical amplifiers 6.5.1 Optical Preamplification Optical amplifiers are routinely used for improving the sensitivity of optical receivers...

Ngày tải lên: 21/01/2014, 06:20