In this paper we present the urgency for the optical transport networking evolution for 5G delivery and ultra-broadband services to users and communities of users, in the followings: (a) Cloud core, Metro-cloud core and edge cloud networking structure with optical SDN and SDN/NFV. (b) Photonic enabled technologies including principal devices and photonic processors. (c) Security aspects and transmission technology for secret keys in co-transmission of massive data transport.
In this paper we present two different techniques for photonic generation of millimeter and THz waves. Each of them tackles the phase noise problem associated with optical sources in a different way. The first one relays on the heterodyne down-conversion of two phase noise correlated optical tones. The correlation is achieved by generation of an optical frequency comb. To select one of the optical lines we use an optical phase lock loop, which besides enabling a frequency offset between output and input, can provide optical gain and is highly selective. The second one relays on the envelope detection of a single sideband-with carrier signal. In this approach the photonic remote antenna unit is implemented as monolithically integrated photonic chip.
In this paper, a Substrate Integrated Waveguide (SIW) based photonic antenna suitable for RoF applications is presented. The millimeter-wave design is based on a diplexer, two Chebyshev bandpass filters, one for uplink (61,7GHz to 62,7 GHz) and one for downlink (59,3 GHz to 60,3 GHz) and one common 8x8 Slot array antenna, integrated on the same substrate. E/M simulations of a fully integrated planar RF Front End provide very good results, both in diplexer and filters and in antenna characteristics. Finally, a consideration regarding transition requirements for integration with a coplanar waveguide (CPW) photodiode is being presented.
Radio-over-fiber systems employing remote antenna units (RAUs) based on coherent optical heterodyne detection of two phase uncorrelated lasers and envelope detection have been recently demonstrated. By using two uncorrelated lasers, this system concept allows simple implementation that can additionally be improved, if thermally uncooled lasers are used. Although such asynchronous receiver design is mildly affected by the laser phase noise, it suffers from the wavelength drift that occurs between the uncooled laser sources. Also, there are performance penalties due to high laser line-width when complex modulation formats are used for transmission. In this work, we analyze the performance of heterodyne based optical receivers, using OOK and multilevel modulation.
Conference Committee Involvement (4)
Broadband Access Communication Technologies XV
23 January 2021 | San Francisco, California, United States
Broadband Access Communication Technologies XIV
4 February 2020 | San Francisco, California, United States
Broadband Access Communication Technologies XIII
4 February 2019 | San Francisco, California, United States
Broadband Access Communication Technologies XII
29 January 2018 | San Francisco, California, United States