The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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.
We will review our recent progress in the fabrication of integrated nanophotonic devices and their applications in on-chip optical signal transmission and processing with advanced modulation formats. We will talk about both theoretical and experimental works on chip-scale optical signal transmission for photonic interconnections and various on-chip photonic signal processing functions (wavelength...
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.
We retrieve the thermal dissipation time of τ=0.25µs and investigate the power dependent absorption in a SiN microring resonator. We estimate n2=4.3×10−19m2/W based on clear 1 GHz optical modulation of the refractive index.
We observe a transition to a coherent-comb state in a SiN-microresonator with anomalous dispersion. Although ∼300 fs pulse trains are generated after line-by-line shaping, the intensity within the microring does not appear to be pulse-like.
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).
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 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.
We experimentally demonstrate optical multiplexing of 40-Gbit/s channels at different wavelengths onto a single 640-Gbit/s channel and subsequent 640-to-10-Gbit/s demultiplexing using cascaded nonlinear optical loop mirrors. An average penalty of ~3.5 dB at 10-9 BER is observed after the nonlinear processes.
We present a 2.3-Tbit/s network switching element by exploiting double-pass LCoS technology and bidirectional nonlinear effects inside a single HNLF. We demonstrate 2.3-Tbit/s grooming switch with simultaneous functions of add/drop, data exchange, and power equalization, for 23-channel 100-Gbit/s RZ-DQPSK signals.
We experimentally demonstrate optical multiplexing of two 20-Gbit/s QPSK channels at different wavelengths onto a single 40-Gbit/s star 16-QAM channel with tunable ring ratio using cascaded fiber-based nonlinear stages. The impact of QPSK channel spacing is also investigated. BER measurements confirm the effectiveness of the proposed scheme.
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 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 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 report tributary channel data traffic grooming/exchange of pol-muxed DPSK signal based on Kerr-induced nonlinear polarization rotation. 8 tributary channel data grooming between two pol-muxed 80-Gbit/s DPSK channels is demonstrated with a penalty of <4 dB.
Vertically-slotted waveguides are used to achieve low nonlinearity. Compared with strip waveguide, it demonstrates a >25× reduction in the nonlinear coefficient for a 100-nm wavelength range.
Dual slot waveguides incorporate a sub-core in the slot, so that the guided beam is confined two-dimensionally. The modification enlarges the room for tailoring dispersive properties and birefringence. Both zero-dispersion and constant-dispersion points are demonstrated.
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.
The high-contrast gratings assisted hollow-core waveguide demonstrates an ultra-low nonlinearity (<6 ?? 10-13 /W/m). Digital and analog system-level simulations further show that the waveguide does not introduce any observable nonlinearity-induced penalty.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.