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This paper demonstrates, for the first time, stable 16-Gbit/s 16-QAM signal homodyne detection. By extracting +/−π/4 and +/−3π/4-phase data symbols from 16-QAM optical signal, our decision-driven Costas loop for QPSK code achieved the local oscillator light phase-locking to the signal carrier wave modulated at 16-QAM. Homodyne phase-lock is confirmed in an experiment by observing eye opening of 4-level...
We demonstrate a phase-noise linear increment proportional to the spectral mode number of a 25-GHz-spaced frequency comb generated from a phase-modulated laser by using the beat note between each comb mode and a tunable laser.
This paper proposes a simple but effective technique to cancel the waves generated by four-wave mixing in phase-locked multi-carrier transmission. The cancellation rate of FWM lights to the total that falls on a frequency grid was calculated to be 99% for some carrier phase set.
Proposed is an approach to achieving a carrier-envelope-offset (CEO)-locked frequency comb with 25 GHz mode spacing in the telecommunications wavelength region. To achieve the approach, a 250 fs laser pulse train at a 25 GHz repetition rate was developed by intensity- and phase-modulating a seed light emitted from a continuous-wave laser diode and propagating it through a dispersive fibre. Using the...
We propose an approach to achieving a carrier-envelope phase-locked frequency comb with 25-GHz mode spacing at 1.5 µm. We demonstrate octave-spanning supercontinuum generation with the widest mode spacing ever achieved using a CW laser diode.
A novel optical frequency stabilisation technique on the ITU-T frequency grid employing modulated sideband light is proposed. The L-band laser diode second sideband light generated by phase-modulation is locked to a carbon monoxide 12C16O gas absorption line; the original carrier is placed on the ITU-T frequency grid. The square root of Allan variance of 10-8 has been achieved for a period of 12 h.
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