We report on advanced millimeter-wave (mm-wave) photonic components for broadband wireless transmission. We have developed self-pulsating 60 GHz range quantumdash Fabry-Perot mode-locked laser diodes (MLLD) for passive, i.e. unlocked, photonic mm-wave generation with comparably low phase noise level of-76 dBc/Hz @ 100 kHz offset from 58.8 GHz carrier. We further report on high-frequency 1.55 µm waveguide photodiodes (PD) with partially p-doped absorber for broadband operation (f 3dB~7 0-110 GHz) and peak output power levels up to +4.5 dBm @ 110 GHz as well as wideband antenna integrated photomixers for operation within 30-300 GHz and peak output power levels of-11 dBm @ 100 GHz and 6 mA photocurrent. We further present compact 60 GHz wireless transmitter and receiver modules for wireless transmission of uncompressed 1080p (2.97 Gb/s) HDTV signals utilizing the developed MLLD and mm-wave PD. Error-free (BER=10-9 , 2 31-1 PRBS, NRZ) outdoor transmission of 3 Gb/s over 25 m is demonstrated as well as wireless transmission of uncompressed HDTV signals in the 60 GHz band. Finally, an advanced 60 GHz photonic wireless system offering record data throughputs and spectral efficiencies is presented. For the first time, we demonstrate photonic wireless transmission of data throughputs up to 27.04 Gbit/s (EVM 17.6 %) using a 16-QAM OFDM modulation format resulting in a spectral efficiency as high as 3.86 bit/s/Hz. Wireless experiments were carried out within the regulated 57-64 GHz band in a lab environment with a maximum transmit power of-1 dBm and 23 dBi gain antennas for a wireless span of 2.5 m. This span can be extended to some 100 m span when using highgain antennas and higher transmit power levels.

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Abstract-This paper describes the problematic of filter narrowing effect in the context of next generation elastic optical networks. First, three possible scenarios are introduced: the transition from actual fixed-grid to a flexi-grid network; the generic full flexi-grid network; and a proposal for filterless optical network. Next, we investigate different transmission techniques and evaluate the penalty introduced by the filtering effect when considering: Nyquist WDM, SSB DD-OFDM and symbol-rate variable DP-4QAM. Also, different approaches to compensate for the filter narrowing effect are discussed. Results show that the specific needs per each scenario can be fulfilled by the aforementioned technologies and techniques, or a combination of them, when balancing performance, network reach and cost.Index Terms-Networks, optical communications, elastic optical networks, flexi-grid, WSS. I. INTRODUCTIONThe future adoption of elastic optical network (EON), mainly fostered by the advent of next technologies (e.g., media, HDTV, 5G, Internet of Things, etc.) and backed by the considerable advances of transmission techniques in terms of flexibility and capacity, is heading to undertake new challenges and goals. In fact, when adopting the flexi-grid paradigm [1], optical channels with different bandwidth occupation can coexist within the same fiber. Some of these channels, denominated as super-channels, are wider in frequency and comprise multiple sub-channels transmitted

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