Abstract
We show for the first time 100 Gbit/s total capacity at 2 µm waveband, using 4 × 9.3 Gbit/s 4-ASK Fast-OFDM direct modulation and 4 × 15.7 Gbit/s NRZ-OOK external modulation, spanning a 36.3 nm wide wavelength range. WDM transmission was successfully demonstrated over 1.15 km of low-loss hollow core photonic bandgap fiber (HC-PBGF) and over 1 km of solid core fiber (SCF). We conclude that the OSNR penalty associated with the SCF is minimal, while a ~1-2 dB penalty was observed after the HC-PBGF probably due to mode coupling to higher-order modes.
Highlights
One focus of the photonics research community has been the development of generation transmission systems capable of meeting the ever-increasing demand for high bandwidth Internet traffic
We show for the first time 100 Gbit/s total capacity at 2 μm waveband, using 4 × 9.3 Gbit/s 4-amplitude shift keying (4-ASK) Fast-orthogonal frequency division multiplexing (OFDM) direct modulation and 4 × 15.7 Gbit/s NRZ-on-off keying (OOK) external modulation, spanning a 36.3 nm wide wavelength range
WDM transmission was successfully demonstrated over 1.15 km of low-loss hollow core photonic bandgap fiber (HC-PBGF) and over 1 km of solid core fiber (SCF)
Summary
One focus of the photonics research community has been the development of generation transmission systems capable of meeting the ever-increasing demand for high bandwidth Internet traffic. To overcome the limitations of SMF, mode division multiplexing techniques in few-mode fiber transmission systems at 1.55 μm have recently been demonstrated [2], which largely increases the spectral efficiency, and the total capacity. The WDM signals were transmitted over either 1.15 km of low-loss HC-PBGF, or 1 km of single mode solid core fiber (SCF) intended for the 2 μm wavelength range [13], both with error-free performance. This demonstration was achieved by using a newer generation of high performance laser sources, a higher bandwidth photo-detector, and by improving the fiber fabrication process [7]. A total capacity of 100 Gbit/s was achieved by externally modulating four lasers with non-return-to-zero (NRZ) on-off keying (OOK) at 15.7 Gbit/s, and directly modulating four lasers with 4-amplitude shift keying (4-ASK) FastOFDM [14], each at 9.3 Gbit/s (excluding 7% FEC overheads), spanning a total optical bandwidth of 36.3 nm
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