By Kiyoshi Nosu (auth.), Sadakuni Shimada PhD (eds.)
This booklet covers a variety of technical matters in terms of lightwave applied sciences utilizing excessive coherence lightwaves. Electromagnetic wave conversation began whilst the 1st instant method was once invented via Marconi in 1895. even if, we needed to wait approximately 100 years to achieve the same expertise within the lightwave frequency area. the discovery of lasers in 1960 and expertise thoughts in 1970 -low loss silica fiber and semiconductor lasers working at room temperature - promoted the advance of fiber-optic transmission platforms. The deployment of high-speed long-haul fiber-optic transmission structures has ended in the formation of family and foreign trunk networks. The put in fiber cables in neighborhood loop crops offer multimedia communique companies together with broadband video. besides the fact that, current lightwave communique platforms don't totally make the most of the fruitful strength oflightwaves, particularly the means of super excessive frequency electromagnetic info service waves. The frequency oflightwaves used for fiber-optic transmission is set 2 hundred THz 14 (2 x 10 Hz), and the frequency bandwidth of the fiber low loss area is set thirteen 20 THz (2 x 10 Hz). fresh advancements of slender spectrum width semiconduc tor laser and planar optical waveguide units supply us the probabilities for a brand new iteration of lightwave-based conversation structures. This booklet makes a speciality of procedure features ofthe new iteration lightwave communi cation applied sciences equivalent to optical frequency department multiplexing and coherent detection. bankruptcy 1 overviews lightwave communique procedure technology.
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The received optical power is compared at peak power level. The receiver sensitivity of FSK is improved by 3 dB compared with that of ASK. This is because the signal amplitude of FSK is twice that of ASK while the noise power is also twice. Therefore the signal-to-noise ratio of FSK is twice that of ASK. The receiver sensitivity of DPSK is 3 dB better compared with that of FSK. The bandwidth of DPSK is half that of FSK. Therefore, the sensitivity of DPSK is improved. 4. The receiver sensitivity difference between heterodyne and homodyne detection is explained by the bandwidth difference.
8 p W of signal power for every kilohertz of the laser linewidth. _ _ _--I 1 10 100 1,000 10,000 100,000 Fig. 18 The phase-error standard deviation versus the normalized loop band with for several values of the power-to-linewidth ratio. Source: Kazovsky (1986). 59) where Rb is the bit rate. The other type of phase-locked loop is analyzed in a similar manner. 60) Balanced phase-locked loops impose more stringent requirements on the laser linewidth than decision-driven loops according to Kazovsky (1986).
The error rate performance depends on the IF bandpass filter bandwidth. 12 shows the effect of IF filter bandwidth. Receiver sensitivity is shown as a function of B, with the linewidth as a parameter. 37) Namely, the ideal filter is a matched filter with a bandwidth equal to the bit rate. However, if the linewidth is not negligible, a broader bandwidth is optimum. In the case of ASK systems, the error rate floor also depends on the threshold level. 2 Differential detection We will consider two types of differential detection schemes: DPSK and CPFSK with differential detection.