Real-time Downstream 25Gbit/s PAM4 for High Speed TDM-PONs with both 25 and 12.5Gbit/s ONUs

TDM-PON PAM Downstream Transmission for 25 Gbit/s and Beyond

“…Furthermore, it has been shown that the OB gain when substituting Gray for binary encoding for PAM4 remains small-lower than 0.2 dB at a Bit Error Rate (BER) of 1.10-3 [19]. Here, we decided to study the binary encoding for PAM4 and PAM8, which is closer to our reference study [11].…”

“…Modulation formats other than the standard Non-Return-to-Zero (NRZ) are being considered within the HS-PON study group. Multilevel formats such as Duo-Binary [6][7][8] and Pulse Amplitude Modulation with 4 levels (PAM4) [9][10][11], currently used in data center communication [12] and Visible Light Communications (VLC) [13], are good candidates to achieve 25 Gbit/s while keeping 10 GHz optics. State-of-the-art PAM4 reports devoted to optical access networks have, however, been limited in most cases to offline transmissions.…”

“…In a previous work, we demonstrated a real-time 25 Gbit/s PAM4 downstream transmission based on 10 G optics, achieving a 29 dB Optical Budget (OB) corresponding to a −18.5 dBm receiver sensitivity up to 40 km in O band [11]. We use our previous experimental work to fine-tune the proposed simulation model, and we then extrapolate the model results to assess higher bit rates by either adding more amplitude levels on the signal while keeping the same optical bandwidths or by using optics with higher bandwidths to achieve 37.5 Gbit/s and 50 Gbit/s throughputs, which are aligned with target bit rates currently investigated in the normative framework [3].…”

Design and implementation of a single carrier 800Gbit/s optical communication electrical layer board

“…As shown in Figure 1, the board consists of four parts: line side unit, service processing unit, customer side unit and monitoring and management unit. The line side unit consists of a WL5e DCO module to realize the line side single carrier 800Gbit/s [3] coherent transmission; the service processing unit is based on Inphi PAM4 [4] Gearbox chip vega to realize the customer side rate transformation and convert to the coding mode supported by the line side unit; the customer side unit includes 4x100G and 1x400G interfaces [5] to realize the reception and transmission of customer side optical signals, supporting two types of customer side optical modules; the monitoring and management unit consists of ARM and FPGA with the frame. and transmitting, supporting two types of customer-side optical modules; monitoring and management unit consists of ARM and FPGA communicating with the frame master through UART, I2C, SPI, SGMII bus, FPGA collecting optical module data information through I2C bus, collecting DCO WL5e data through SGMII interface, collecting Vega data through MDC/MIO bus, and reporting to ARM, which is responsible for the configuration and management of each function module.…”