Performance analysis of III-V/SOI microdisk based all-optical gate for on-chip interconnects

All-optical devices such as optical filters, (de)multiplexers, switches, modulators and optical buffers etc. have been demonstrated either on silicon or hybrid silicon platform. Power consumption, speed of operation, bandwidth and footprint etc. are important performance metrics for on-chip interconnects. Here we present the experimental and theoretical analysis of the performance of an all-optical gate, realized on III- V/SQl platform, for its applications in on-chip photonic interconnects

A very compact InP-based integrated optic Mach-Zehnder interferometer with a delay difference of 74 ps

A Mach-Zehnder interferometer with 6.0 mm arm length difference was realised on InP. The design is very compact, using deeply etched waveguides and circular bends with 50 mu m radius. The devices show a sinusoidal frequency response with 13.5 GHz period and extinction ratios up to 20 d

Heterogeneously integrated microdisk lasers for optical interconnects and optical logic

Optical interconnect and optical packet switching systems could take advantage of small footprint, low power lasers and optical logic elements. Microdisk lasers, with a diameter below 10 mu m and fabricated in InP membranes with a high index contrast, offer this possibility at the telecom wavelengths. The lasers are fabricated using heterogeneous integration of InP membranes on silicon-on-insulator (SOI) passive waveguide circuits, which allows to combine the active elements with compact, high-index contrast passive elements. The lasing mode in such microdisk lasers is a whispering gallery mode, which can be either in the clockwise (CW) or counter clockwise direction (CCW) or in both. The coupling to the SOI wire waveguides is through evanescent coupling. Predefined, unidirectional operation can be achieved by terminating the SOI wires at one end with Bragg gratings. For all-optical flip-flops, the laser operation must be switchable between CW and CCW, using short optical pulses. Unidirectional operation in either direction is only possible if the coupling between CW and CCW direction is very small, requiring small sidewall surface roughness, and if the gain suppression is sufficiently large, requiring large internal power levels. All-optical flip-flops based on microdisk lasers with diameter of 7.5 mu m have been demonstrated. They operate with a CW power consumption of a few mW and switch in 60ps with switching energies as low as 1.8fJ. Operation as all-optical gate has also been demonstrated. The surface roughness is limited through optimized etching of the disks and the large internal power is obtained through good heat sink

InP-based photonic integration : learning from CMOS

In the last decades the complexity of InP-based Photonic Integrated Circuits has increased by almost two orders. In this paper past and future developments in Photonic Integration will be discussed

InP-based photonic integration : learning from CMOS

In the last decades the complexity of InP-based Photonic Integrated Circuits has increased by almost two orders. In this paper past and future developments in Photonic Integration will be discussed

Very steep optical thresholding characteristic using a DFB laser diode and a SOA in an optical feedback scheme

A new optical decision or thresholding circuit, composed of a semiconductor optical amplifier (SOA) and a distributed feedback (DFB) laser diode in an optical feedback scheme is proposed. This new circuit has been studied both by simulations and experiments. Simulations show a very steep optical decision characteristic that rises more then 5 dB over an input power range of less then 0.5 dB. It is also demonstrated that the decision point can easily be shifted by tuning the drive currents of both the laser diode or the SOA or the feedback ratio between them. The principle has been experimentally verified as well, using a discrete SOA and DFB laser diode. We showed a good agreement with the simulation results. Again a very steep optical decision characteristic, combined with the possibility to adjust the decision point was obtained

Role of longitudinal mode dynamics in laterally coupled lasers

Our report focuses on the strong kink found in the P-I output of an asymmetric twin stripe semiconductor laser. A multi longitudinal mode model is used to describe the system. The model allows for asymmetric coupling of the two lasers and also accounts for multi longitudinal effects within and in-between the lasers

Systematic Analysis, Synthesis and Realization of Monolithic Microwave Active Inductors

A unified analysis of monolithic microwave active inductors based on an amplifler-feedback topological description is introduced, Active inductors are classified based on the gain and feedback elements constituent to their design, Small signal, large signal and noise behavior are considered in the generic case. An illustrative example of the synthesis procedure for, as well as the measured results of a novel topology are presente

InP-based photonic integrated circuit with WDM switched optical delay lines for true-time-delay beamsteering of a 40 GHz phased-array antenna

We have realized an InP-based WDM switched-optical-delay-lines chip that can introduce time shifts between four wavelengths at the 1555nm region. The losses are around 27dB and the switching speed is 1 OOns measured from the bondpads