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We experimentally demonstrate a feedback-assisted 1.08 Gb/s orbital angular momentum (OAM)-based underwater-to-air wireless optical link with a floating mirror for beam steering. The experimental results show favorable performance of the proposed feedback scheme in the present of the change of water level.
We propose and experimentally demonstrate a compact integrated silicon photonic comb filter based on two cascaded Sagnac-loop mirrors. By using thermal tuning with three micro-heaters, the center wavelength can be tuned over several FSRs and the 3-dB bandwidth can be tuned to 2.5 GHz.
An add-drop filter with asymmetric coupling to bus waveguides, cascaded with a notch filter, enables non-reciprocal data transmission through direction dependent resonance shift. Strong dispersion and attenuation near resonance allows one-way 10 Gbps data transmission.
We propose a simple approach to realize ultra-high peak rejection notch microwave photonic filter (MPF). Using a conventional phase modulator and a tunable bandpass filter, we achieve a notch MPF with an ultra-high peak rejection > 60 dB based on a single notch silicon microring resonator.
A silicon optical diode enables optical non-reciprocity through direction-dependent resonance shift of microrings based on the thermo-optic effect in silicon. We observe an ultra-high nonreciprocal transmission ratio of 40 dB with an improved design of the optical diode. One-way 10Gbps data transmission is realized based on the strong dispersion and attenuation associated with a resonant structure.
We design and fabricate a simple ultracompact wavelength-controllable bi-directional optical diode. It consists of a silicon microring (nonlinear attenuator) and a directional coupler (linear attenuator). High nonreciprocal transmission (∼24.2dB) is achieved. Negligible-penalty OFDM/OAM 64-QAM signaling through the diode is demonstrated.
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 present an ultra-compact optical diode using nonlinear second-order silicon microring resonator which is complementary metal-oxide semiconductor (CMOS) compatible. The designed optical diode features high isolation (>20 dB) and more tolerant resonance wavelength mismatch (+/−0.35 nm with <1.5 dB isolation degradation).
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.
An optical diode consisting of cascaded silicon micro-resonators enables non-reciprocal transmission through direction dependent resonance shift. One-way 10Gbps data transmission is realized through the strong dispersion and attenuation associated with a resonant structure.
We demonstrate an all-silicon optical transistor that realizes NAND and NOR logic without the need to physically alter the device. The device is cascadable and may provide an efficient solid-state implementation of artificial neural networks.
An add-drop filter with asymmetric coupling to bus waveguides, cascaded with a notch filter, achieves diode and transistor effects, and realizes NAND and NOR logic without physically altering the device, emulating the function of neurons.
We observe passive mode-locking behavior of an optical frequency comb generated in a silicon nitride microresonator. With the drop geometry, a femtosecond pulse could be generated without shaping and filtering the spectrum.
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.
We demonstrate an optical diode with up to 28dB transmission contrast at telecommunication wavelengths. It is based on strong optical nonlinearity in two resonance-matched silicon microrings. No external assistance other than input light is required.
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 demonstrate a scheme for reconfigurably selecting multiple tributaries of a 640-Gbit/s signal using cross-phase modulation in cascaded nonlinear optical loop mirrors (NOLMs). An average penalty of ~3.5 dB is introduced by each NOLM after arbitrarily selecting two 40-Gbit/s tributaries and subsequently redistributing them.
We demonstrate multicasting of 40 Gb/s NRZ-OOK data into 24 RZ copies using a single pump and supercontinuum generation. The NRZ signal is optically sampled and a supercontinuum is generated using the sampled signal. An average ∼1.6 dB power penalty is achieved for 24 channels at a BER of 10−9.
We experimentally demonstrate simultaneous two-channel wavelength conversion of 40-Gbit/s RZ-DPSK WDM signals using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF) without additional pumps. A power penalty of <1 dB is observed as channel spacing varies from 200 GHz to 1 THz.
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