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Wavelength division multiplex (WDM) system with on / off keying (OOK)modulation and direct detection (DD) is generally simple to implement, lessexpensive and energy efficient. The determination of the possible designcapacity limit, in terms of the bit rate-distance product in WDM-OOK-DD systemsis therefore crucial, considering transmitter / receiver simplicity, as well asenergy and cost efficiency. A 32-channel wavelength division multiplex systemis designed and simulated over 1000 km fiber length using Optsim commercialsimulation software. The standard channel spacing of 0.4 nm was used in theC-band range from 1.5436-1.556 nm. Each channel used the simple non return tozero - on / off keying (NRZ-OOK) modulation format to modulate a continuouswave (CW) laser source at 40 Gbps using an external modulator, while thereceiver uses a DD scheme. It is proposed that the design will be suitable forlong haul mobile backbone in a national network, since up to 1.28 Tbps datarates can be transmitted over 1000 km. A bit rate-length product of 1.28Pbps.km was obtained as the optimum capacity limit in 32 channel dispersionmanaged WDM-OOK-DD system.

Design and simulation of 1.28 Tbps dense wavelength division multiplex system suitable for long haul backbone