We present the latest progress on digital coherent optical transmission technologies and their prospects for deployment for broadband radio access, ultimately realizing a full-coherent integrated network. Recent advances in digital coherent optical transmission technologies have made it possible to utilize both the intensity and phase of an optical field, thus allowing seamless convergence with a wireless network. Such a system, which we term a full-coherent system, can offer substantial advantages in terms of transparency, cost, and bandwidth scalability for broadband radio access networks.
We have described a frequency-stabilized, polarization-maintained erbium fiber ring laser. This laser has no frequency
modulation at the output beam. A tunable single-mode laser has also been newly developed by simultaneously
controlling a tunable FBG with a 1.5 GHz bandwidth and a PZT in the cavity. The frequency stability reached as high as
1.3 x 10-11 for an integration time of 1 s and the linewidth was as narrow as 4 kHz. Using this coherent laser as a light
source, we successfully transmitted a 20 Msymbol/s coherent quadrature amplitude modulation (QAM) signal over 525
km and achieved error free transmission.
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