C. C. Lee

All-optical add–drop node for optical packet-switched networks

We have demonstrated all-optical packet add-drop for all-optical packet-switched networks. Intelligent all-optical add-drop of packets is performed, based on all-optical processing of packet headers. The header and payload rates are 5 and 10 Gbits/s, respectively.

All-Optical Clock Recovery Using Erbium-Doped Fiber Laser Incorporating an Electroabsorption Modulator and a Linear Optical Amplifier

We demonstrated a 10-GHz all-optical clock recovery system using an erbium-doped fiber laser that incorporates an electroabsorption modulator and a linear optical amplifier. Stable pulses with peak power of 200 mW and pulsewidth of 6 ps are obtained. The output power and the pulsewidth of the recovered clock pulses are independent of the input data pattern. Stable optical clock can still be observed when the input data rate varies by more than 60% of the fundamental frequency without any optical tunable delay line inside the laser cavity. The scheme is essentially wavelength transparent for the whole C-band which recovers clock pulses from input data wavelength between 1525 and 1565 nm

10-Gb/s Wavelength Transparent Optically Controlled Buffer Using Photonic-Crystal-Fiber-Based Nonlinear Optical Loop Mirror

We have proposed and experimentally demonstrated a 10-Gb/s optically controlled buffer using a photonic-crystal-fiber (PCF)-based nonlinear optical loop mirror for all-optical packet-switched networks. The 10-Gb/s data can be stored in the buffer up to a period of 2.5 mus. By using the cross-phase modulation property between the control signal and the data signal inside the PCF, the total length of the fiber used in the buffer can be shortened to 30.9 m. The stored data packets are retrieved after they are stored in the memory for 2,4,..., and 12 round-trips. Independent bit-error-rate (BER) measurements have been carried out. The maximum power penalty is 3.3 dB at 1550 nm. The proposed buffer is wavelength transparent. For data packets stored in the C-band, the maximum power penalty after the data are stored in the memory for 12 round-trips is 3.5 dB at the BER of 10-9

Optically controlled 2×2 switching cell for packet-switched networks

We demonstrated a 10 Gb/s optically controlled 2times2 switching cell which can be used to construct NtimesN all-optical switches for all-optical packet-switched networks. All-optical packet-switching is performed based on a single optical control bit.

All-optical add-drop node for packet-switched networks

We demonstrated all-optical packet add/drop for all-optical packet-switched networks. Intelligent all-optical add-drop of packets is performed based on all-optical processing of packet headers. The header and payload rates are 5 Gb/s and 10 Gb/s respectively.

1/spl times/4 all-optical packet switch with all-optical header processing

We demonstrated a 1/spl times/4 all-optical packet switch using injection-locking in a Fabry-Perot laser diode for all-optical header processing and cross gain modulation in an SOA for packet switching.

2×2 deflection routing node for optical packet-switched networks

We experimentally demonstrated a 2times2 deflection routing module for all-optical packet-switched networks. Output port contentions are resolved based on all-optical processing of the packet headers. Both the header and payload rates are 10 Gb/s.

N×N all-optical packet sorter

We experimentally demonstrated a 2times2 all-optical packet sorter which can be used as a building block for an NtimesN packet sorter for all-optical packet-switched network. Both the header and payload rates are 10 Gb/s.

Binary-encoded Address for All-optical Packet Switching

We experimentally demonstrated the feasibility of binary-encoded packet address header in all-optical packet switching using Fabry-Perot laser diodes. The address length of a network with N output ports is reduced from N to log2N bits.

10 Gb/s Wavelength Transparent All-optical Memory using PCF-based Nonlinear Optical Loop Mirror

We demonstrated a 10 Gb/s all-optical memory using a PCF-based NOLM. The data can be stored in a 29 m long fiber for 2.5 mus. The power penalty at BER of 10-9 is 3.5 dB.