10-Gb/s transmission and beyond

Calculation of dispersion and nonlinear effect limited maximum TDM and FDM bit rates of transform-limited pulses in single-mode optical fibers

“…PTICAL transmission bit rates are ever growing toward 0 tera bt/s ranges [ 11. [7] and significant efforts are being made to utilize the full optical bandwidth of silicate glass fibers, which is about 30 THz totally for both 1.3 and 1.5 pm wavelength bands, [3] in optical communication systems. To this end not only high-speed transmission technologies in time domain but also high-density wavelength-or(and) frequencydivision multiplexed (WDMFDM) transmission technologies in either wavelength or frequency domain, are being exploited.…”

“…Thus, the total bit rate can be calculated by taking a summation on the maximum TDM bit rate over the entire wavelength range in step of 2 .AA Fig. 2 shows the calculated maximum total bit rates attainable through combinations of TDM and FDM as a function of optical pulse width for dispersion-shifted(DS) fibers both in the low-loss region at the 1.5 pm communication band and in the maximum small-signal gain region of EDFA's, which range approximately from 1480 nm to 1600 nm and from 1525 nm to 1565 nm, respectively [3], [9]. The maximum saturated bit rates of 7.0 Tbt/s and 2.3 Tbt/s can be obtained with the combined time-and frequency-division multiplexing at relatively long pulse widths for the low-loss region and for the EDFA's gain region, respectively, regardless of fiber lengths used as shown in the figure.…”

“…Praseodymium-doped fiber amplifiers(PDFAs). The typical low-loss region of the 1.3 pm band ranges approximately from 1255 nm to 1340 nm, [3] and the typical maximum gain region of PDFAs ranges from 1290 nm to 1320 nm [lo]. Like in the 1.5 pm band the maximum saturated bit rates of 6.9 Tbt/s and 2.4 Tbt/s can be obtained with the combined timeand frequency-division multiplexing at relatively long pulse widths for the low-loss region of the 1.3 pm band and for the PDFA's gain region, respectively, regardless fiber lengths used as shown in the figure.…”