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We investigate enhanced coupling of the pump laser as a result of power transfer to the frequency comb in a silicon nitride microring designed with an over-coupled bus-waveguide.
Mode-interaction-aided soft excitation of dark solitons in normal dispersion nonlinear microresonators is proved both experimentally and in simulation for the first time, resulting in dark pulse mode-locked broadband Kerr combs.
We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator.
The coherence properties of a frequency comb generated by a SiN microring resonator is shown to be changed by the feedback through a self tracking, narrowband single longitudinal mode filter in an active fiber loop.
We report the spectral pump equalization of on-chip microresonator frequency combs in the drop-port geometry. A smoother comb spectrum is obtained and a saturation behavior of the optical pump in the microresonator is observed.
We evaluate the optical communication performance of individual comb lines generated in silicon nitride microresonators. A high coherence mode yields error-free communications at 10 Gb/s, while a partially coherent mode results in closed eye diagrams.
An optical diode transmits forward 10Gbps data with less than 0.5dB power penalty, while suppressing and distorting backward data with a 11dB nominal power penalty. The nonreciprocal transmission is also demonstrated with a silicon modulator.
By exploiting non-degenerate four-wave mixing in highly nonlinear fibers assisted by two phase-modulated pumps, we report optical multicasted hexadecimal coding/decoding of 16-QAM. Constellation manipulation for a 10-Gbaud/s 16-QAM signal is demonstrated with OSNR penalties of <2.4 dB for multicasted coding and <1.6 dB for decoding.
We report spectral phase characterization, compression, and shaping of on-chip microresonator combs. Both ∼5nm and ∼1nm free spectral range devices are explored.
A 640Gbit/s reconfigurable OTDM add/drop multiplexer is demonstrated, using a single periodically-poled Lithium-Niobate waveguide in a counter-propagating configuration. Error free operations confirm the effectiveness of a single device for simultaneous add/drop operations.
We propose and demonstrate optical hexadecimal coding/decoding of 16-QAM using degenerate four-wave mixing (FWM) in highly nonlinear fibers (HNLFs). Constellation manipulation for variable coding/decoding of a 10-Gbaud/s 16-QAM signal is implemented with an OSNR penalty of <1.1 dB with CW pump and <1.2 dB with phase-modulated pump Key.
We report spectral phase characterization and optical arbitrary waveform generation of on-chip microresonator combs. Random relative frequency shifts due to uncorrelated variations of frequency dependent phase are at or below the 100 μHz level.
We propose and experimentally demonstrate UWB monocycle generation using non-degenerated two-photon absorption in a silicon waveguide. A 8.69-GHz 10-dB bandwidth (BW) and a 154.5% fractional bandwidth is achieved with a ∼125 ps monocycle pulse.
A method of reconfigurable frequency up/down-conversion using an optical parametric loop mirror is proposed. Up-conversion of up to 60GHz and down-conversion from 40GHz for single and WDM signals are demonstrated.
We report phase-transparent DQPSK data exchange using parametric depletion in a highly nonlinear fiber. 100-Gbit/s DQPSK data exchange is demonstrated with a power penalty less than 5dB. Pump misalignment tolerance (+/-2ps) and input signal power dynamic range (~20dB) are investigated.
We report the phase-transparent optical data exchange based on non-degenerate FWM in an HNLF via theoretical analysis and experimental verification. 40-Gbit/s NRZ-DPSK data exchange is demonstrated with a power penalty (at 10-9) ~ 4.5 dB.
We demonstrate tributary channel data grooming of high-speed signals using second-order nonlinearities in a PPLN waveguide. 16 TDM tributary channel data traffic grooming/exchange between two 160-Gbit/s WDM signals is shown with a penalty of ~4 dB.
We experimentally demonstrate 40-to-320-Gbit/s phase-coherent WDM-to-TDM multiplexing based on cross-phase modulation (XPM) and subsequent 320-to-40-Gbit/s demultiplexing using XPM-induced frequency shift in highly nonlinear fibers. An average penalty of approximately 7 dB at 10-9 BER is observed after the nonlinear processes.
We experimentally demonstrate the use of continuously tunable optical parametric delay at 160-Gbit/s based on conversion/dispersion for demultiplexing a 160-Gbit/s signal to 40-Gbit/s. A 15.2 ns delay with <0.1 ps resolution is shown, which introduces 3-6 dB power penalty.
We report a novel method for all-optical generation of differential Manchester phase-shift keying (DMCPSK) coding. Multicasting generation of 40 Gbit/s DMCPSK coding is experimentally demonstrated using non-degenerate four-wave mixing (ND-FWM) in a highly nonlinear fiber (HNLF).
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