A sharp growth in the transmission capacities of photonic transport networks has necessitated an increase in the spectral efficiency and number of wavelength channels. Advanced photonic transport technology in the T-band (thousand band: 1000–1260 nm, available bandwidth of 61.9 THz) is a promising solution to expanding the usable wavelength channels for optical communication to increase the available capacity. The available bandwidth in the T-band is approximately five times that of the conventional C- and L-bands, and, therefore, we propose an ultra-broadband photonic transport system that employs waveband multiplexing technology which is compatible with both novel and conventional wavebands. Wavelength-tunable quantum dot (QD) laser technologies aid the availability of the T-band with its wide wavelength tunability. An endlessly single-mode holey fiber (HF) is used as a wave-band multiplexing transmission line in the O- and T-bands. Optimizing the spectral efficiency is key to realizing high-capacity transmission using advanced digital signal processing (DSP) technology with a coherent detection scheme. In the study, we successfully demonstrated error-free transmission with 20-Gb/s quadrature phase-shift keying (QPSK) using homodyne detection receivers in the O- and T-bands simultaneously over a 4-km long HF. The measured bit error rates (BERs) were within the forward error correction limit of 2×10-3 in both the O- and T-bands. The large number of wavelength channels with conventional use of the O- and T-bands should help increase the total capacity of an optical fiber to meet the growth in demand of optical communication data traffic.
Shoko Yamada, Atsushi Kanno, Naokatsu Yamamoto, and Hideyuki Sotobayashi, "Wave-band multiplexed 20-Gb/s QPSK simultaneous transmission over 4-km holey fiber in O- and T-bands with homodyne detection," Proc. SPIE 10561, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII, 105610Q (Presented at SPIE OPTO: January 31, 2018; Published: 29 January 2018); https://doi.org/10.1117/12.2288966.
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