M. Kalyvas

20 Gb/s all-optical XOR with UNI gate

All-optical Boolean XOR is demonstrated on a 20 Gb/s pseudodata pattern using a semiconductor optical amplifier-based ultrafast nonlinear interferometer (UNI) switch. Bit pattern switching with low-pattern dependence and low switching energies is achieved.

Clock recovery circuit for optical packets

We demonstrate an all-optical clock recovery circuit for operation with short data packets of 10-Gb/s rate. The circuit uses a Fabry-Perot etalon and a nonlinear UNI gate and is capable of acquiring the clock signal within a few bits.

Multiwavelength and power equalized SOA laser sources

Multiwavelength and power-equalized operation is demonstrated in a semiconductor optical amplifier ring laser that uses a fiber Fabry-Perot filter. By using single-pass optical feedback, the power-equalized oscillating spectrum is broadened so that simultaneous oscillation of 52 lines spaced at 50 GHz is achieved. The lines had 500 MHz width were power-equalized to within 0.3 dB and the extinction was better than 32 dB.

Design algorithm of all-optical linear feedback shift registers

Abstract We demonstrate an algorithm for the design and implementation of an all-optical linear feedback shift register (LFSR), based on optically controlled XOR gate and optical shift registers. The algorithm tackles the huge length of optical shift registers to produce controllable pseudorandom binary sequences (PRBS).

40 Gb's all-optical write' store memory using a single semiconductor optical amplifier- based logic gate

We demonstrate an all-optical regenerative memory with full write/store capability of 40 Gb/s data pack- ets. The memory uses an ultrafast nonlinear interferometer logic gate and does not perform data inverting in each pass. Regenerative storage of variable-length data packets with low switching energies and different storage times is verified.

An alternative implementation perspective for the scheduling switch architecture

In this paper, a novel configuration is proposed for the implementation of an almost all-optical switch architecture called the scheduling switch, which when combined with appropriate wait-for-reservation or tell-and-go connection and flow control protocols provides lossless communication for traffic that satisfies certain smoothness properties. An all-optical 2/spl times/2 exchange/bypass (E/B) switch based on the nonlinear operation of a semiconductor optical amplifier (SOA) is considered as the basic building block of the scheduling switch as opposed to active SOA-based space switches that use injection current to switch between ON and OFF states. The experimental demonstration of the optically addressable 2/spl times/2 E/B, which is summarized for 10-Gb/s data packets as well as synchronous digital hierarchy (SDH)/STM-64 data frames, ensures the feasibility of the proposed configuration at high speeds, with low switching energy and low losses during the scheduling process. In addition, it provides reduction of the number of required components for the construction of the scheduling switch, which is calculated to be 50% in the number of active elements and 33% in the fiber length.

All-optical control signal generation to drive optical gates for packet switching applications

We present a technique to generate control signals to power optical gates for packet switching. The technique employs a Fabry-Perot filter and a Semiconductor Optical Amplifier and is tested at 10 and 40 GHz.

All-optical packet clock generation from decision pulses

Packet clock generation from flag bits is demonstrated, using a Fabry-Perot filter followed by a semiconductor optical amplifier. Ten clock pulses are generated from a single pulse with less than 0.45 dB amplitude modulation.

Experimental and theoretical study of crosstalk in WDM - CATV systems

Fiber nonlinearities are assessed theoretically and experimentally for WDM-CATV transmissions. For fixed channel number, twofold reduction of channel spacing or for fixed spacing, twofold increase of channel number, increases crosstalk by 3dB/ch and 1dB/ch, respectively.