We successfully developed the Quantum Dot (QD) light source in the T- and O-band (Thousand-band: 1.000–1.260 μm
and O-band: 1.260–1.360 μm).We used the optical gain chip properties of a single InAs/InGaAs QD to develop a 1.3
μm waveband QD optical frequency comb laser (QD-CML) as the novel functional wavelength divisio nmultiplexing
(WDM) light source. The QD-CML can be used for stable generation of multiple-wavelength peaks that the QD-CML
can be selected and controlled using the optical interference of the etalon filter. We used holey fiber (HF) transmission
line to successfully demonstrate an O-band photonic transport system. In this experiment, each single peak could be
clearly selected in the wavelength range the 1286- to 1302 nm. An error-free data transmission of the 10-Gb/s signal with
stable multiple-wavelength channels that were generated from a newly developed 1.3 μm waveband multiple-wavelength
quantum dot light source was achieved over the low-loss HF that was 8 -km long. We suggest that the low cross-talk for
a data transmission can be achieved using the multiple-wavelength peaks from the QD light source. Based on these
experimental results, it is clear that the generation of multiple-wavelength peaks in the 1.3 μm waveband can be
successfully achieved using from the multiple-wavelength QD light source, which acts as a single QD optical gain device.
Photonic transport systems in the C+L bands have been extensively employed in conventional networks. The
continuously expanding demand for greater photonic network capacities has created the need for the use of additional
wavebands to strengthen the transmission capacities. We recently focused on the use of a novel wavelength band such as
1.0-μm (thousand band: T band), together with the conventional C and L bands, to enhance the usable optical frequency
resources in future photonic networks employing waveband division multiplexing. Furthermore, we successfully
demonstrated an ultra-broadband T-band photonic transport system using a holey fiber (HF) transmission line to create a
wide range of usable optical frequency resources over 8.4 THz (wavelength range: 1037-1068 nm). In constructing an
ultra-broadband photonic transport system for the T, C, and L bands, HF is considered to be a great candidate for an
ultra-broadband and high-capacity data transmission line. In this study, we demonstrated a polarization division
multiplexing (PDM) photonic transport system for doubling the optical frequency resources in the T band. Error-free
PDM photonic transmissions in the T band with a clear eye opening at 10 Gb/s were successfully achieved over a long
distance using an 11.4-km HF transmission line for the first time. To upgrade the present photonic network system, we
believe the technologies of the demonstrated T-band PDM, together with WDM photonic transport systems using the
>10-km long HF transmission line, represent a pioneering breakthrough in the use of ultra-broadband optical frequency
resources.
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