Naimish Patel

40-Gb/s demultiplexing using an ultrafast nonlinear interferometer (UNI)

We demonstrate a 40-Gb/s demultiplexer using an ultrafast nonlinear interferometer (UNI). Bit-error-rate (BER) measurements are performed yielding incurred power penalties less than 3.3 dB for BER of 10/sup -9/.

40-Gbit/s cascadable all-optical logic with an ultrafast nonlinear interferometer

We demonstrate 40-Gbitys all-optical bitwise inversion and wavelength conversion, using an ultrafast nonlinear interferometer. This device uses optically induced gain and index nonlinearities in a semiconductor amplifier to achieve the high-rate switching. The device is cascadable and can be configured to perform a variety of switching functions. As an example, 10-Gbitys results of OR and NOR gating are presented.

Optical rate conversion for high-speed TDM networks

Rate conversion of ultrahigh-speed optical data streams to lower rate optical data streams that can be detected and processed electronically is essential in 100-Gb/s time-division multiplexed (TDM) multiaccess networks. In this letter, we demonstrate all-optical rate conversion.

All-fiber optical demultiplexer and XOR gate

We present a novel all fiber device for use as a high speed optical demultiplexer and logic gate. The device has particular applicability to demultiplexing for high data rate optical networks in addition to all optical address recognition via XOR gating.

100-Gbit/s time-division multiplexed multi-access networks

The trend toward higher bandwidth networks includes rapid growth of bursty datagram and other dynamic virtual-circuit services. Optical time-division multi-access (OTDM) networks can provide low-access-delay bandwidth on demand to support these services. Using optical techniques, future networks could operate at burst rates of 100 Gbit/s because OTDM techniques allow very high-speed optical logic and buffering that are capable of operating at these high data rates. Aspects of OTDM technology requirements are examined including HLAN architecture implementation.

All-optical rate conversion

100 Gbit/s TDM multi-access networks will provide guaranteed bandwidth and bandwidth-on-demand packet service to high-end users. In these networks, most of the data processing will be performed electronically. Therefore, it is essential for a receiver node to buffer the incoming ultrahigh-speed (100 Gbit/s) optical data packets, rate convert the data to electronic rates (100 MHz-10 GHz), detect and process the data. Rate-converted data is a time-dilated version of the original data, and as such, differs from demultiplexed data. Time dilation of clock and data streams to low rates has been used as a pulse-characterization technique. Such schemes enabled characterization of narrow pulses without high-speed photodiodes or mechanical translation stages. We demonstrate that an optical sampling technique maybe used to achieve rate conversion in network applications where the desired time-dilated data stream rates range from 100 MHz-10 GHz. We demonstrate all-optical rate conversion of 10 Gbit/s data packets to 100 Mbit/s, 200 Mbit/s, 400 Mbit/s, 600 Mbit/s, and 800 Mbit/s data packets. The variation in the converted data rate is achieved using a tunable-repetition-rate sampling source. Extension of this technique to rate-converting 100 Gbit/s data streams is straightforward and will be discussed.

High-speed optical logic

All-optical switches and logic gates have been studied for many years, primarily because of their potential for high-speed operation. High-speed operation has been demonstrated in optical AND (demultiplexing) gates. For example, researchers have demonstrated all-optical demultiplexing of 100 Gbit/s data streams using a variety of optical switching elements. Still, all-optical bit-wise logic has not been demonstrated above 40 Gbit/s. However, rapid advances in the demonstrated switching speeds of optical logic gates are expected in the near future.