50G-PON: The First ITU-T Higher-Speed PON System

Experimental Demonstration of In-Field 400G Coherent Metro-Access Convergence

“…The two biggest revolutions in optical networking in the last 15 years are undoubtedly optically amplified DSPbased coherent transmission, that lead to an enormous increase in performance in long haul and (more recently) metro networks, and the widespread deployment of Fiber-to-the-Home worlwide, where more than 800 million fibre broadband subscribers are estimated today, almost all on the Passive Optical Network (PON) architecture [1]. For techno-economic reasons, PON transmission is based on intensity modulation and direct detection (IM-DD), like all the other shorter reach fiber applications.…”

“…For techno-economic reasons, PON transmission is based on intensity modulation and direct detection (IM-DD), like all the other shorter reach fiber applications. The PON IM-DD-based IEEE and ITU-T standards are anyway approaching today fundamental physical layer limitations in terms of increasing transmission speed (see the recent 50G-PON ITU-T standard [1]), but also in reach and/or optical power budget [2]. These shortcomings are today being addressed in an ITU-T discussion on future 100 or 200 Gbps/λ PON by considering new solutions, such as 4-PAM as opposed to traditional binary OOK, even more powerful FEC and strong of pre-or post-equalization through DSP [2,3].…”

A Minimal Coherent Receiver for 200 Gb/s/λ PON Downstream With Measured 29 dB Power Budget

“…I NCREASING demands for bandwidth in access networks, largely driven by 5G backhaul and UHD video streaming, are driving demand for longer reach and higher bandwidth access networks [1], and are great factors in the development of next generation passive optical network (PON) standards. International Telecommunication Union-Telecommunications Standardization Sector (ITU-T) has recently made steps towards the standardization of Higher Speed PON at 50 Gb/s [2]. Considering the line rate progression of previous standards, we can assume the target of 200 Gb/s for next generation coherent PON technology [3].…”

Stable wavelength-swept single-frequency erbium fiber laser in L-band tuning bandwidth

“…Besides, the MZI based filter can be also employed to generate the CW wavelength-swept and SLM oscillation. As mentioned above, the requirement of broad bandwidth for end users are more and more considerable recently [19]. Hence, to meet with the broadband demand, the EDF lasers also require to extend to L-band range for the broadband applications.…”