Km Of Dispersion-shifted Fiber Research Articles

11 Gbit/s, 260 km transmission experiment using a directly-modulated 1536 nm DFB laser with two Er-doped fibre amplifiers and clock recovery

A fully retimed 11 Gbit/s optical digital system using a directly-modulated DFB laser and clock recovery circuitry is tested in long span transmission experiments incorporating two Er-doped fibre amplifiers. Non-regenerated transmission on 260 km of dispersion-shifted fibre is demonstrated.

An 11 Gbit/s, 151 km transmission experiment employing a 1480 nm pumped erbium-doped in-line fiber amplifier

By using an in-line erbium-doped fiber amplifier with a net gain of 20.5 dB, it was possible to transmit an 11 Gb/s NRZ signal over 151 km of dispersion-shifted fiber. The bit rate distance product of 1.66 Tb/s-km obtained for a single-laser link with optical amplifiers experiment is a substantial improvement over the previous record of 1.03 Tb/s-km. The measurements indicate that new systems optimization procedures, as well as the incorporation of additional optical isolators, are required in order to assure stable operation with minimum system degradations.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

11 Gbit/s optical transmission experiment using 1540nm DFB laser with non-return-to-zero modulation and pin /HEMT receiver

An 11 Gbit/s optical transmission experiment, employing a 1540nm distributed feedback (DFB) laser modulated with non-retum-to-zero signal format and an ultrawideband pin/ HEMT receiver, is described. This is the highest data rate transmission experiment reported to date using a directly modulated DFB laser. A span of 81 km of dispersion shiftedfibre was employed resulting in a record bit rate-distance product of 890 Gbit/s km, with no observable penalty due to insertion of the fibre.

Transmission over 107 km of dispersion-shifted fibre at 16 Mbit/s using a 1.55 μm edge-emitting source

We report transmission over 107 km of dispersion-shifted fibre at 16 Mbit/s using a subthreshold laser as an edge-emitting LED source, demonstrating the suitability of such a fibre-source combination for low-cost, inherently upgradable telecommunication systems.

Low-dispersion 1.55 μm optical system operating at 320 Mbaud over 103.5 km

Error-free transmission has been achieved at 320 Mbaud over 103.5 km of dispersion-shifted fibre using a conventional 1.55 μm laser. The dispersion penalty is shown to be less than 0.1 dB.