Through the performance analysis of DWDM ring with Optical Add-Drop Multiplexer (OADM) based on fiber grating and optical circulators, mathematic model of the indexes to evaluate the crosstalk pertormance,namely power penalty and throughput,is established. We also describe the model with graphs and draw a conclusion:to get a network with excellent performance,proper optical power,the number of nodes,the loss in every node and bit rate are needed.
The numerical results show that the system suffers a power penalty of 4.8 dB corresponding to chromatic dispersion index r=0.4 for seven-chip M-sequence,at a BER of 10-9.It is further noticed that the number of simultaneous users are limited to 24 for r=0.4 and 20 for r=0.6,for 31-chip M-sequence,at 6 dB power penalty.
Optical fiber transmission experiments at a data rate of 10 Gb/s show that the module can be used for long-haul transmission. After transmission through 40 km,the power penalty is less than 1 dBm at a bit-error-rate of 10~(-12).
The performance of a 1 Gb/s and 20 channels system is compared for conventional and dispersion shifted fibers. With 10 GHz channel separation ,the lowest power penalty of central channel is 1. 75 dB for heterodyne detection and 0. 77 dB for direct detection after 1 000 km in dispersion shifted fiber, but for conventional fibers, it is 0. 9 dB of heterodyne detection and 0. 38 dB of direct detection.
The effect of intersymbol interference (ISI) in optical phase diversity FSK (PD-FSK) sys-tems is analyzed. The expressions of the associated power penalty resulting from ISI are proposed for the first. The relation between the power penalty and the system parameters is studied with typical parameter values.
In this paper, we analyze the effects of mode partition characteristics of semi-conductor laser diodes on optical fiber transmission system, discuss the physical meaning of mode partition coefficient K and calculate the transmission bit rate, distance and corresponding power penalty for the system in different bit-error-rate asymptotic line, fluctuation level, wave-length and optical source spectrum.
This paper analyzes the effect of mode partition noise of laser diodes on the optical fiber transmission system.In the case of different error-rate asym- ptotic line,fluctuation level,center wavelength and optical source spectrumwidth, the transmission bit rate,distance and the corresponding power penalty are cal- culated.