M.C. Cardakli

Reconfigurable optical packet header recognition and routing using time-to-wavelength mapping and tunable fiber Bragg gratings for correlation decoding

We achieve reconfigurable optical header recognition and penalty-free routing of a 2.5 Gb/s packet stream with a 1.6-ns guard time. Our method uses cross-gain compression in a semiconductor optical amplifier for time-to-wavelength mapping, and two fiber Bragg grating arrays for tunable correlation decoding. This technique may be of value in future high-speed optical packet-switching nodes.

Tunable all-optical time-slot-interchange and wavelength conversion using difference-frequency-generation and optical buffers

In this letter, we demonstrate a module that simultaneously performs optical time-slot interchange and wavelength conversion of the bits in a 2.5-Gb/s data stream to achieve a reconfigurable time/wavelength switch. Our switch uses difference-requency-generation (DFG) for wavelength conversion and fiber Bragg gratings as wavelength-dependent optical time buffers. This tunable technique employs high-extinction-ratio and low-additive-noise DFG.

Synchronization of a network element for optical packet switching using optical correlators and wavelength shifting

The authors demonstrate packet and bit synchronization of an optical switching node to an incoming packet stream. Their module synchronizes to packets with only four preamble bits and employs fiber Bragg gratings as continuous optical correlators and cross-gain modulation of an semiconductor optical amplifier as a wavelength shifter to determine the start of a packet. They use this optical technique to recognize the arrival of 2.5-Gb/s data packets and to route them to one of two outputs of an optical switch in a reconfigurable network. Penalty-free switching with a 1.6-ns guard time is achieved.

All-optical output-port contention resolution using subcarrier-multiplexing

We demonstrate an all-optical contention resolution technique that preserves the wavelength of two same-wavelength contending incoming 2.5 Gbit/s channels. This is achieved by optically subcarrier-multiplexing one channel to a higher RF frequency beyond the first baseband channel on the same input wavelength. By using narrow (/spl sim/5 GHz) fiber Fabry-Perot filters for demultiplexing we recovered each channel using a baseband receiver with <1 dB power penalty.

Variable-bit-rate header recognition for reconfigurable networks using tunable fiber-Bragg-gratings as optical correlators

We demonstrate variable-bit-rate recognition of the header information in a data packet. Our technique is reconfigurable for different header sequences and uses optical correlators as look-up tables. We use this optical technique to recognize the header and switch a series of incoming data packets at 155 Mb/s, 622 Mb/s, and 2.5 Gb/s to one of two outputs in a reconfigurable network. Penalty-fee routing with a 1.6 ns guard time is achieved.

All-optical packet header recognition and switching in a reconfigurable network using fiber Bragg gratings for time-to-wavelength mapping and decoding

We demonstrate reconfigurable all-optical header recognition and routing of a 2.5-Gbit/s packet stream using time-to-wavelength mapping with a fiber Bragg grating array correlation decoding. We achieve penalty-free routing using a 1.6-ns guard time. This technique would be useful to enable high-speed all-optical packet switching nodes.

All-optical time-slot-interchange and wavelength conversion using difference-frequency-generation and FBGs

We demonstrate simultaneous all optical time-slot-interchange and wavelength conversion of a 2.5 Gb/s bit stream. We used different frequency generation (DFG) as a wavelength converter and fibre Bragg gratings (FBG)s as optical buffers. This technique is reconfigurable, scalable and employs high-extinction-ratio DFG-based time-slot-switching.

Control monitoring of routing bits and data packets in WDM networks using wavelength-to-time mapping

We demonstrate a wavelength-to-time technique for control monitoring in a wavelength-division multiplexing (WDM) network. We recover the routing header bits across parallel wavelength as well as determine the existence of data packets for switching purposes. We show results for a routing-bit monitor of multiple channels with the speed of 2.5 Gbps and a packet/frame monitor for multiple channels with the speed of 100 MHz.

Optical subcarrier-multiplexing for output-port contention resolution

We demonstrate an all-optical contention resolution technique that combines two identical-wavelength contending 2.5 Gbit/s channels into the same output-port wavelength channel. This is achieved by optically up-converting one channel to a higher microwave frequency beyond the other channels baseband signal and routing both channels out the desired output-port wavelength channel simultaneously. By using narrow (/spl sim/5 GHz) fiber Fabry-Perot filters for optically demultiplexing the two channels, we recover each channel using a baseband receiver with <1 dB power penalty.