Yury Logvin

Monolithically integrated optical channel monitor for DWDM transmission systems

The design, fabrication, and performance of an InP-based monolithically integrated optical power monitor are presented. It contains 44 wavelength channels separated by 100 GHz and demonstrates record small footprint size. The devices major components, which include the echelle diffractive grating demultiplexer, passive waveguide circuitry and single-mode vertically integrated waveguide PIN photodetectors, are characterized and discussed as generic building blocks of InP-based planar lightwave technology for DWDM.

Third-order dispersion impact on mode-locking regimes of Yb-doped fiber laser with photonic bandgap fiber for dispersion compensation

Novel features in stretched-pulse and similariton mode-locked regimes of Yb-doped fiber laser with photonic bandgap fiber used for dispersion compensation are found by means of numerical simulations. We show that the mode-locked pulse may become shorter with increasing third-order dispersion. Analytical estimations explain observed behavior through resonant interaction of the main pulse with dispersive waves involving both resonant sidebands and zero-group-velocity dispersion waves. Switching between the stretched-pulse and the similariton regimes is also studied.

Similariton pulse instability in mode-locked Yb-doped fiber laser in the vicinity of zero cavity dispersion

Stability of the similariton mode-locked regime in Yb-doped fiber laser in the vicinity of zero cavity dispersion is studied by means of numerical simulations. It is shown that similariton pulses which initially arise from laser noise collapse into a continuous wave state. The mode-locked pulses are found to be stable after a certain cavity dispersion threshold is exceeded. From analysis of the instability development, we conclude that instability has parametric nature. We compare our results with stability analysis based on the Ginzburg-Landau approach. Analogies with instabilities found in the long-haul fiber communication systems are also discussed.

44-channel optical power monitor based on an echelle grating demultiplexer and a waveguide photodetector array monolithically integrated on an InP substrate

An InP-based monolithically integrated optical power monitor is presented. It utilizes an echelle grating demultiplexer having single-mode vertically integrated GalnAs waveguide PIN photodetectors inserted into each of its 44 output channels. The device enables high performance monitoring and has a footprint of only 7.3/spl times/20 mm.

Steady and oscillating multiple dissipative solitons in normal-dispersion mode-locked Yb-doped fiber laser.

Multiple dissipative solitons are numerically studied in the normal-cavity-dispersion Yb-doped fiber laser. Soliton pairs and triplets of different types are found in parameter domain where single soliton mode-locking is unstable. Similar scenario is found for soliton pair and triplet: an additional weak soliton supplements already existing solitons, then with increasing gain the solitons start oscillating and at higher gain the soliton complex becomes stable. Spectral profiles of the solitons dynamically change taking either parabolic-like or Pi-like or M-like shape similar to those described in the literature for individual dissipative soliton at different pump level.

On-chip emitter for regrowth-free multi-guide vertical integration in InP

We describe the design concepts, performance features and application capabilities of on-chip laser sources for regrowth-free multi-guide vertical integration in indium phosphide, based on the compatibility requirements of this monolithic photonic integration platform.

Suppression of multi-period instabilities by third-order dispersion in mode-locked Yb-doped fiber lasers

Multi-period pulsing instabilities in a Yb-doped ring fiber laser with a mode-locking mechanism provided by nonlinear polarization rotation are studied by means of numerical simulations. The impact of the third-order dispersion (TOD) of cavity elements on dynamic instabilities of the stretched-pulse mode-locked regime is elucidated. Different instability types with symmetry-preserving and symmetry-breaking features are found in a wide range of cavity group velocity dispersion (GVD). At a large anomalous cavity GVD, where a stretched-pulse mode-locked regime borders the soliton regime, multi-period pulsing instabilities result from the development of new resonant subsidebands associated with unstable dispersive waves. When a cavity GVD approaches zero and resonant sidebands are suppressed, multi-period pulsing is caused by parametric instability of the frequencies near the spectrum center. It is demonstrated that TOD suppresses both symmetry-preserving and symmetry-breaking multi-period instabilities in the stretched-pulse regime. From the analysis of the spectral sidebands, we conclude that instability suppression is related with a modification of the resonant coupling between the mode-locked pulse and the phase-velocity as well as group-velocity-matched dispersive waves.

High performance DP-QPSK receiver module incorporating InP-based integrated coherent detection chip

This paper presented a fully integrated InP coherent receiver chip for a dual polarization QPSK application. The chip, which has the highest responsivity reported to date, used a unique layout to benefit module assembly and minimize excess loss. The overall responsivity of a full module with VOA functionality exceeded 0.07A/W. The paper also demonstrated a miniaturized version of our chip which is suitable for future size and cost reductions.

100Gb/s Receiver Photonic Integrated Circuits in InP for Applications in Fiber-Optics Interconnects

We present 4×25Gb/s space and wavelength division multiplexing receiver chips, based on a multi-guide vertical integration in InP. State-of-the-art performance and small footprint size make them well suited for use in 100Gb/s optical interconnects.

Wavelength splitter for on-chip coarse WDM in regrowth-free PICs in InP

We describe the design, fabrication and characterization of a waveguide wavelength splitter — a generic on-chip coarse wavelength-division (de)multiplexing solution for regrowth-free multi-guide vertical integration in InP. The splitter operation is based on a combination of wavelength selective vertical transfer between optical waveguides stacked one above the other in a descending order of their guiding core bandgap and lateral re-routing of the vertically transferred wavelength(s).