We develop a novel graded-index plastic optical fiber (GI POF) that achieves ultra-low bit error rate of less than 10^-15 for four-level pulse-amplitude modulation (PAM4) at 53 Gb/s without error correction techniques in short-reach multimode fiber (MMF) links. The stability of data transmission is attributed to significant noise reduction in MMF links through strong mode coupling closely related to the microscopic heterogeneities in the novel GI POF core material. The novel GI POF can eliminate the need for error correction techniques in high-speed multilevel PAM transmission systems to reduce communication delay and power consumption, paving the way for optical interconnects in real time at a high speed and with low power consumption for data centers and UHD transmission systems.
Graded-index plastic optical fiber (GI POF) with high bandwidth and excellent flexibility is a promising candidate for optical interconnects in applications such as data centers, automotives, and households. Recently, we have developed a novel GI POF that enables significantly low-noise data transmission by controlling light scattering properties through the microscopic heterogeneous structures formed in the fiber core material. This novel GI POF can contribute to energy saving and low latency in high-speed communication systems, especially in data centers, because of ultra-stable data transmission without the need for error correction techniques. In this talk, the recent progress of the GI POF technology is presented toward the upcoming Beyond 5G era.
We propose a novel graded-index plastic optical fiber (GI POF) link that enables stable high-speed data transmission without the requirement for conventional coupling techniques to reduce reflection at fiber connection, as typified by physical-contact (PC) fiber connection. The stability is attributed to the reduction in noise caused by reflection at the fiber connection through strong mode coupling in the fiber. The novel GI POF link will be advantageous for optical interconnects in household and automotive applications, in which PC connection is not ideal to apply. It will also be invaluable for multi-fiber interconnects based on multi-fiber connectors for data center applications, in which complete PC connections are difficult to obtain.
We have proposed a novel graded-index plastic optical fiber (GI POF) to achieve stable data transmission in a multimode fiber link, which is capable of error-free data transmission (bit error rate < 10^-12) employing four-level pulse-amplitude modulation at data rate of 53 Gb/s without the use of forward error correction. The novel GI POF has strong mode coupling due to the microscopic heterogeneities in the fiber core material, which decreases noise and stabilizes data transmission. Here, we demonstrate that the novel GI POF significantly improves fiber-misalignment tolerance for stable data transmission. The novel GI POF paves the way for an unprecedented optical interconnect that enables reliable data transmission without the requirement of precise fiber alignment and high-precision fiber connectors.
A graded-index plastic optical fiber (GI POF) is a promising optical cable for indoor networks because of its flexibility, safety, and high bandwidth. Recently, we proposed a low-noise GI POF utilizing the strong mode coupling due to the distinctive microscopic heterogeneities in the core polymer material. This will facilitate the proliferation of noise-sensitive radio-over-fiber (RoF) transmission and multilevel pulse-amplitude modulation (PAM), which are vital for ultra-high-definition (UHD) media transmission in indoor networks. Here, we introduce the recent progress in the GI POF technology for next-generation indoor networks in the upcoming UHD era.
We have proposed a low-noise graded-index plastic optical fiber (GI POF) with the microscopic heterogeneous strictures in the fiber core material. The microscopic heterogeneities in the low-noise GI POF provide strong mode coupling and stabilize data transmission through the reduction in interferometric noise in a multimode fiber link. Here, we present our latest work in which error-free data transmission employing four-level pulse-amplitude modulation (PAM-4) at a data rate of 53 Gb/s has been achieved using the low-noise GI POF without the use of forward error correction techniques in short-reach links. We also present the detailed analysis of the distinctive microscopic heterogeneities in the low-noise GI POF that achieves error-free PAM-4 transmission.
Ultra-high-definition applications will be one of the main drivers for emerging 5G communications. 5G supports higher data rate utilizing higher frequency bands than those in existing cellular systems. However, higher-frequency radio waves have higher directionalities, resulting in decreased indoor coverage. Therefore, radio-over-fiber (RoF) systems are needed for indoor distribution of wireless signals. Recently, we developed a graded-index plastic optical fiber (GI POF) that enables higher-quality RoF transmission than conventional multimode fibers for short-distance links (<100 m). The GI POF can reduce noise and distortion in RoF transmission through its strong mode coupling. Here, we demonstrate that the GI POF significantly increases fiber-misalignment tolerance in RoF transmission. The GI POF will realize do-it-yourself optical fiber connections for indoor applications.
The growing demand for high-speed data transmission in consumer applications such as 4K/8K television motivates the development of multilevel modulation. Multilevel modulation can increase bit rate over 2-level modulation for same symbol rate, but is subject to noise and modulation instability in optical link. Recently, we experimentally demonstrated that a graded-index plastic optical fiber (GI POF) significantly improved the transmission signal quality compared with a silica GI multimode fiber (MMF) in the consumer-friendly MMF link without an optical isolator, where laser and optical fiber easily coupled. This high-quality transmission is related to reflection noise reduction because of a strong mode coupling in the GI POF. However, the signal quality also depends on the modulation response of the vertical-cavity surface-emitting laser (VCSEL) coupled with optical fibers. Here, we investigate the influence of the strong mode coupling in the low-noise GI POF on the modulation response of the VCSEL in the consumer-friendly MMF link. We show that the low-noise GI POF can significantly decrease the distortion of the modulation response compared with the silica GI MMF which easily coupled with the VCSEL. This low-distortion performance is related to the strong mode coupling in the low-noise GI POF, which stabilizes the VCSEL owing to the self-coupling reduction of the optical feedback into the VCSEL cavity. This suggests that the novel GI POF allows for highly-stabilized multilevel transmission for consumer-friendly 8K interface. In the conference, we will also discuss the mechanism for the stabilization effects of the low-noise GI POF using theoretical analyses.
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