The paper proposed a novel hybrid modulation format -16-level differential phase shift keying with binary amplitude
shift keying(16DPSK-ASK), which carries 5 bits per symbol. With analyzing the characteristics of optical 16-level
differential phase shift keying (16DPSK), the study analyzed 16DPSK-ASK modem methods theoretically and presented
the methods in their achieving processes specifically. Based on RZ-16DPSK-ASK and CSRZ-16DPSK-ASK modulation
methods, spectra and their eye diagrams following demodulator of Matlab simulation were obtained. The optimal back to
back extinction ratio was derived, so that the equivalent eye opening was obtained for the amplitude tributary and phase
tributary. The results showed that the 16DPSK-ASK hybrid modulation methods, as a possible new modulation format,
not only have much narrower spectra with higher spectrum efficiency but also simplify the transmitter and receiver
comparing with the same level modulation format. The satisfactory performance of the eye diagrams obtained after
demodulation suggested that it was one of the dominant candidate modulation formats high-speed optical transmission
system.
A spectral sliced multiwavelength laser source which utilizes supercontinuum generated in a high nonlinear dispersion
flattened holey fiber(HNL-DF-HF) and spectral slicing in an arrayed waveguide grating has been demonstrated. All 32
channels exhibit almost constant pulsewidth, the channel separation is 100GHz, and crosstalk of the adjacent channels is
more than 25dB.
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