engleski

Extended-Cavity Optical Sources with Modulation Averaging Reflectors

Passive optical networks with wavelength multiplex (WDM-PON) allow high speed transmission in access networks, but have not yet been widely deployed primarily due to cost of such a system. Wavelength-agnostic transceivers at the user end in colorless WDM-PON systems offer significant cost reduction as each of the optical network units is identical. The cost and complexity of the system is further reduced by using self-seeded WDM-PON architectures in which a reflector at a remote node allows the amplified-spontaneous-emission signal emitted from the reflective semiconductor optical amplifier to seed itself. We introduce a new component in the self-seeded systems, an averaging reflector, and demonstrate that the link margin in such systems can be further improved by it. The modulation-averaging reflector changes the amplitude probability density distribution of the modulated seeding light from a sharply bound distribution into a near-normal distribution which then alters the error statistics and results in improved performance. Most importantly, the modulation-averaging reflector is a passive optical device and therefore the remote nodes in our proposed WDM-PON system remain passive, with no power needed to accomplish this improvement. We demonstrate by measurements that, in self-seeded WDM-PON systems, averaging reflectors improve link margin and allow a wider range of bias conditions for the active element. Fundamental limitations of self-seeded architectures are addressed. Finally a 47 km transmission over standard G.652 fiber at 1.25 Gbps with a fully passive remote node is demonstrated.

WDM-PON; colorless optical transmitter; averaging reflector; access optical networks; passive optical networks (PON); incoherent optical source; reflective semiconductor optical amplifier (RSOA)

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