engleski

New Developments in Optical Technology at University of Zagreb

This talk presents recent advances in optical technology performed at the Department of Wireless Communications, Faculty of Electrical Engineering and Computing, University of Zagreb. The first part of a talk briefly introduces design challenges of a new type of optical source suitable for next generation access networks. Wavelength-agnostic transceivers at the user end in colorless passive optical networks with wavelength division multiplexing (WDM-PON) 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. This latter type of system, although demonstrated, has not yet been adopted in the industry because it does not have sufficient link margin for commercial adoption. We have demonstrated that a new component, a modulation averaging reflector, can be used to improve the link margin and to broaden the operating conditions of the semiconductor source to warrant commercial adoption of self seeded WDM-PON communication systems. In the second part of the talk recent results in development of fiber-optic sensor systems are presented and discussed. The properties of temperature and strain sensors based on Fiber Bragg Gratings (FBG) are well known, however interrogation techniques are still not standardized and usually present a critical factor in pushing users away from optical sensors due to high price. By carefully studying the properties of several interrogation techniques and developing our own technique we will demonstrate that it is possible to significantly reduce the price of these interrogation units.

Access networks; WDM-PON; Wavelength-agnostic transceivers; Optical sensors

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