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Error-free PAM-4 transmission by a high-speed plastic optical fiber without forward error correction
Optics Letters
|July 30, 2021
Summary
Researchers achieved error-free four-level pulse-amplitude modulation (PAM-4) transmission using graded-index plastic optical fiber (GI POF) without forward error correction (FEC). This breakthrough enables high-speed, low-power optical interconnects for short-reach applications.
Area of Science:
- Optoelectronics
- Materials Science
- Optical Communications
Background:
- Plastic optical fibers (POFs) are attractive for short-reach optical interconnects due to their cost and flexibility.
- Traditional optical systems often rely on forward error correction (FEC) to achieve reliable data transmission, but FEC increases latency and power consumption.
- Achieving high data rates with error-free transmission in POFs without FEC has been a significant challenge.
Purpose of the Study:
- To demonstrate error-free four-level pulse-amplitude modulation (PAM-4) transmission over graded-index plastic optical fiber (GI POF) without FEC.
- To investigate the role of material heterogeneities in stabilizing high-speed PAM-4 signals.
- To pave the way for low-power, high-speed optical interconnects by leveraging material properties.
Main Methods:
- Development of a novel graded-index plastic optical fiber (GI POF) with specific microscopic heterogeneities.
- Experimental setup for high data rate (>50 Gb/s) PAM-4 signal transmission over a 10 m GI POF link.
- Performance evaluation of the transmission system, focusing on error rates and signal stability without FEC.
Main Results:
- Successfully achieved error-free PAM-4 transmission at data rates exceeding 50 Gb/s over 10 m of GI POF.
- Demonstrated that the unique microscopic heterogeneities in the GI POF core enable distinct mode coupling, significantly stabilizing PAM-4 transmission.
- Confirmed that FEC techniques are not required for reliable transmission, thus reducing communication delay and power consumption.
Conclusions:
- The developed GI POF enables high-speed, error-free PAM-4 optical communication without the need for FEC.
- This material-centric approach offers a pathway to "material changes the system" for future optical interconnects.
- The findings support the development of real-time, high-speed, and low-power optical communication systems.
