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We demonstrated that impairments caused by chromatic dispersion, fiber nonlinearity, and the ASE of optical amplifiers were effectively suppressed using in-line PSA repeaters. Over 3200-km transmission of 28-Gb/s BPSK signal was achieved without dispersion compensation.
We confirm experimentally that 100-Gbit/s digital coherent PDM-QPSK exhibits high tolerance against at least 50-ps DGD and 1800-ps^2 SOPMD in a large-PMD field testbed comprising 677 km of installed DSF.
Dispersion compensation fiber is one of the causes of transmission delay in optical systems. We demonstrate a low-latency model system employing electronic pre-equalization. The pre-equalization technology saves 1.145 ms of latency over 3,900 km.
We demonstrate 8Tb/s DP-QPSK 50-GHz-spaced DWDM transmission over 457.6-km of installed DSF links with only EDFAs using digital coherent detection. This is the highest capacity field trial yet reported for a 127-Gb/s DP-QPSK DWDM system.
10 Gbps DPSK electronic pre-equalization transmission was demonstrated over 500 km of 8,170 ps/nm SMF in the laboratory and over 360 km of field-installed SMF without any optical dispersion compensation.
Sub-20 fs deep-ultraviolet pulses were generated without a pulse compressor. Our approach allows one to compensate pulse broadening in air and glass appropriately and has a possibility of generating sub-7 fs pulses for ultrafast spectroscopy.
We demonstrate a fast control of an octave-spanning fiber-based frequency comb with an intracavity electro-optic modulator. The servo bandwidth of both repetition and carrier-envelope offset frequency is greater than 200 kHz.
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