Self phase modulation using optisystem code#

1 is employed and inserted between point A and B of Fig. Simulation of Single-Channel Optical Link To design a single-channel optical network, the base optical link of Fig. Parameters of the designed optical networkДЈ. We have used this network as a base for designs of single-channel and WDM optical links to evaluate the RZ- and the NRZ-modulation techniques in each network case. To start with, first the loop was set on 1 and in another attempt it was set on 4 for 100-km and 400-km transmission distances, respectively. In Table 1, the parameters of the designed optical link are tabulated. We have built a loop control in the network to increase the number of spans for each design step, as shown in Fig. To this aim, we have designed a span including a 100-km non-zero dispersion shifted fiber (NZDSF), 2.7 km of dispersion compensating fiber (DCF), an EDFA with a gain of 21 dB and six connectors with a total loss of 4.5 dB.

Design of Optical Link We have designed an optical network to be used as a single-channel wavelength division multiplexing (WDM) link, by using Optisystem software. The analyses are based on eye-diagrams of the simulated received signals in each case. In the present study, we have compared the NRZ- and the RZ-modulation techniques in a 400-km/10-Gb/s single-channel and a 400-km/160-Gb/s WDM networks. Recently, we have designed a 160 Gb/s DWDM network with transmission power of 0 dBm, using NRZ encoding technique through a 32-chanels optical transmitter over a distance of 1000 km. They reported better performance of the RZ modulation format. The results for transmission distance of 400 km showed the BER of 10 -22 and 10 -9 for the RZ- and the NRZ modulation techniques, respectively. Another comparison between the RZ- and the NRZ-techniques has been reported in a 4-users WDM system with bit rate of 2.5-Gb/s per channel. The results of this study showed the better performance of the NRZ format. In a 2.5-Gb/s optical network, the RZ- and the NRZ-modulation formats have been compared, where the BER for the network with the NRZ- and the RZ-modulation techniques were 10 -14 and 10 -12, respectively, with 30-km single-mode fiber link. A comparison of the RZ and the NRZ modulations in laser intra-satellite communication systems showed that by using an amplifier, the RZ format had a better performance for a long transmission distance and without an amplifier, the RZ- and the NRZ-modulation formats had the same performance. The results showed the smaller bandwidth was required by using NRZ format, while better performance of the RZ format was obtained to withstand fiber non-linearity effects. The effects of amplified spontaneous emission in the networks with the RZ, the NRZ, and the CS-RZ modulation formats were evaluated by using an Erbium-doped fiber amplifier (EDFA). They reported that transmission distances of 400 km and 1200 km with bit rate of 40 Gb/s are feasible within the RZ- and the NRZ-modulation formats.

Another comparison between the RZ and the NRZ modulation formats for 40-Gb/s time division multiplexing (TDM) system, showed that for upgrading the existing network to 40-Gb/s, the RZ-modulation format is superior compared to conventional NRZ-modulation. A comparison between the NRZ and the RZ data formats with respect to polarization mode dispersion (PMD)-induced system degradation showed the RZ performance better than the NRZ. The results showed the NRZ format had a similar tolerance to intersymbol interference due to the interaction of dispersion and nonlinearities as that of RZ and CS-RZ formats without FEC.

Self phase modulation using optisystem code#

Another study has been done to compare standard forward error code (FEC) in 40 Gb/s optical transmission systems with NRZ, RZ, and carrier-suppressed RZ (CS-RZ) modulation formats. The results showed that NRZ pulse shape was superior compared with RZ for duobinary transmission in all the cases that were studied including systems that are limited by amplified-spontaneous noise, fiber chromatic dispersion and self-phase modulation. In a study, the RZ and the NRZ techniques have been compared in an optical duobinary system. Also, while the NRZ is more economical, the RZ, on the other hand, is more tolerant to nonlinearity than the NRZ. In a simple comparison, the NRZ technique requires less bandwidth for transmission than the RZ and it is not sensitive to laser phase noise. Introduction Return to zero (RZ) and non-return to zero (NRZ) are the popular techniques, which are used to encode optical pulses in optical networks.