4 Gb/s Transmission over 103 km of Optical Fiber Using a Novel Electronic Multiplexer/Demultiplexer

The lasers behind the communications revolution

“…DFB lasers routinely provide highly single longitudinal mode operation, with other modes rejected by values of 30 dB or more, and the advent of 1.5-µm DFB lasers quickly led to demonstrations of transmission of rates as high as 4 Gb/s over distances of 100 km. 24 DFB lasers have also been critical to the optical transmission of analog signals in the cable television industry, where the linearity of the light-current relationship and reduced dispersive distortion are extremely critical to signal fidelity. Here, highly optimized laser designs have been implemented where analog distortion metrics, such as composite secondand third-order distortions, are kept at maximum values of -63 dB and -67 dB below the carrier.…”

Optical Fiber Communication Systems and their Physical Limitation Effects

“…By proper electrical excitation of the laser the dynamic laser linewidth can also be reduced [12,13]. The AT&T Bell Labs, system [15] marked in Fig. This reduces the dynamic spectral linewidth of the modulated laser [14].…”

“…By calculating the Fourier transform F(oo -oo 0 ) for (15) we have to consider this dynamic effect. The Fourier transform in this case is given by:…”

“…(18) with (4) is now substituted into (15). For the calculation first the spectral range around 1.55 μιη is considered and later the 1.3 μιη range.…”

Lasers and fiber optics

“…Важнейшим преимуществом является воз-можность передачи информации с большой скоростью на большие расстояния без использования ретрансляторов. Так, в настоящее время разработаны си-стемы волоконно-оптической связи, позволяющие передавать информацию со скоростью 4 Гбит/с на расстояние свыше 100 км без ретрансляции 3 . Огромные возможности волоконно-оптической связи и современное состояние развития элементной базы характеризуют реализуемые в настоящее время трансатлан-тическая и транстихоокеанская подводные волоконные линии связи.…”