scholarly journals MZM Optimization of PAM-4 Transmission in Data Center Interconnect

2019 ◽  
Vol 9 (4) ◽  
pp. 637
Author(s):  
Eduard Sonkin ◽  
Dan Sadot ◽  
Gilad Katz
Keyword(s):  
Data Center ◽  
Digital Signal ◽  
Pulse Amplitude ◽  
Optical Signal ◽  
Noise Sensitivity ◽  
Pulse Amplitude Modulation ◽  
Experimental Demonstration ◽  
Signal To Noise ◽  
Sequence Estimation ◽  
Maximum Likelihood Sequence Estimation

An analog optimization of 4-level pulse amplitude modulation (PAM-4) signal is proposed, together with maximum likelihood sequence estimation digital signal processing. The proposed optimizations are verified by experimental demonstration at 53 Gbaud, indicating an improvement of 4–5 dB in the optical signal to noise sensitivity.

Design of a low cost and power efficient 200/400 Gbps optical interconnect using DAC-less simplified PAM4 architecture

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bilas Chowdhury ◽  
Ahmad Atieh ◽  
Engin Eyceyurt ◽  
Syed Murshid
Keyword(s):  
Signal To Noise Ratio ◽  
Low Cost ◽  
Pulse Amplitude ◽  
Symbol Error Rate ◽  
Signal Generation ◽  
Pulse Amplitude Modulation ◽  
Signal To Noise ◽  
Power Efficient ◽  
Laser Sources ◽  
The Cost

Abstract Incoherent addition of three monochromatic laser sources is used to create four distinctive power levels to match the profile of standard quaternary pulse amplitude modulation (PAM4). The proposed PAM4 signal generation results in a lower symbol error rate as compared to standard PAM4 systems. This design improves the signal-to-noise ratio as compared to existing PAM4 schemes and can reduce the cost and power consumption of existing 200 G or higher optical transceivers.

scholarly journals Inverted p-down Design for High-Speed Photodetectors

Photonics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 39
Author(s):  
Masahiro Nada ◽  
Fumito Nakajima ◽  
Toshihide Yoshimatsu ◽  
Yasuhiko Nakanishi ◽  
Atsushi Kanda ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Optical Communications ◽  
High Speed ◽  
Pulse Amplitude ◽  
Avalanche Photodiode ◽  
Device Fabrication ◽  
Pulse Amplitude Modulation ◽  
Optical Coupling ◽  
Pin Photodiodes

We discuss the structural consideration of high-speed photodetectors used for optical communications, focusing on vertical illumination photodetectors suitable for device fabrication and optical coupling. We fabricate an avalanche photodiode that can handle 100-Gbit/s four-level pulse-amplitude modulation (50 Gbaud) signals, and pin photodiodes for 100-Gbaud operation; both are fabricated with our unique inverted p-side down (p-down) design.

scholarly journals Differential pulse-amplitude modulation signalling for free-space optical communications

2019 ◽  
Vol 13 (4) ◽  
pp. 155-160 ◽  
Author(s):  
Mohammad Taghi Dabiri ◽  
Seyed Mohammad Sajad Sadough ◽  
Mohammad Ali Khalighi
Keyword(s):  
Amplitude Modulation ◽  
Optical Communications ◽  
Free Space ◽  
Pulse Amplitude ◽  
Differential Pulse ◽  
Pulse Amplitude Modulation ◽  
Free Space Optical
Sign in / Sign up

Export Citation Format

Share Document