Enhancement of maximum reach on spectrum‐sliced ASE systems employing self‐seeded reflective‐SOAs transmitters

Abstract

A self-seeding wavelength division multiplexing passive optical network scheme employing a directly modulated reflective semiconductor optical amplifier at 1.25 Gbit/s is investigated, aiming longreach applications. Specifically, power penalty and bit error rate (BER) were measured as a function of the fibre length for downstream path. Optical transmission over 140 km, within the forward error correction limit (BER of 10 −4), with a maximum power penalty of 2.7 dB is experimentally demonstrated. In contrast, a pre-spectrumsliced source (PSSL) topology displays a similar penalty but its maximum reach is restricted to 80 km. Thus, the proposal enables an enhancement of 12 dB on power budget when compared with the PSSL topology, as well as eliminates the need for a shared broadband light source.

Double‐RSOA colorless WDM‐PON for 5G fronthaul applications

“…In our case, we validated our simulation work against our own experimental results, from an earlier single RSOA topology, evaluated in our previous publications, 18‐21 in such a way that we have a large amount of available experimental data for a simplified network topology, under a wide range of conditions. Only after a satisfactory match was achieved, we configured our analog fronthaul in the simulator, which, albeit more complex, is fundamentally similar to the experimental network and uses the same kind of components.…”

“…The self-seeding carrier generation process has already been extensively addressed by several authors, including ourselves, encompassing both experimental [18][19][20][21] and system performance aspects. [22][23][24] In particular, the principle of operation of the self-seeding transmitter depicted in Figure 2 is described in detail in our recent work.…”

“…For this purpose, all optical components and devices were configured with the same characteristics from our experimental data. [18][19][20][21] Then, we adjust the simulation values from the nominal parameter values, always within the allowed parameter variations specified in the manufacture data sheets, to match the experimental curves. Specifically, we addressed two main aspects: output characteristics of the RSOAs (gain curves and spectral profiles) and experimental BER measurements, as a function of several system parameters, such as NRZ extinction ratio and RSOA injection power.…”

“…To calibrate the simulations used to investigate the proposed fronthaul topology, we first accurately matched the results from the experimental setup in Figure 4 using the software package Optisystem 13.0. For this purpose, all optical components and devices were configured with the same characteristics from our experimental data 18‐21 . Then, we adjust the simulation values from the nominal parameter values, always within the allowed parameter variations specified in the manufacture data sheets, to match the experimental curves.…”

“…Over the last few years, our group has proposed and investigated a WDM-PON topology combining self-seeding and carrier reuse to provide an entirely colorless network where a single wavelength per channel is used for data flow in both directions. [18][19][20][21] We have recently further improved this topology by employing a second RSOA to reinforce the erasure at both ends. 22 In addition, we investigated this novel topology for A-RoF transport employing direct modulation 23 and its optimization regarding the filtering profile of the arrayed waveguide grating (AWG).…”