Sagie Tsadka

Cascadability and Regenerative Properties of SOA All-Optical DPSK Wavelength Converters

A novel all-optical differential phase-shift keying wavelength converter based on semiconductor optical amplifier nonlinearities is demonstrated in the 25- to 40-Gb/s range with pseudorandom binary sequence of 27-1, and its regenerative properties as well as the cascadability are discussed

Pattern Effect Removal Technique for Semiconductor-Optical-Amplifier-Based Wavelength Conversion

A technique to overcome pattern dependence in semiconductor-optical-amplifier-based wavelength converters is presented. The technique is based on a careful selection of red- and blue-shifted spectral components having complementary pattern effects in the output spectrum of a wavelength-converted signal. Significant signal quality improvements are reported at a bit rate of 40 Gb/s.

All-optical DPSK wavelength converter based on MZI with integrated SOAs and phase shifters

An integrated MZI-SOA device is developed for all-optical wavelength conversion of DPSK signals. The functionality is investigated close to 40 Gb/s and error free operation with less then 1 dB penalty is demonstrated.

Tunable all-optical signal regenerator with a semiconductor optical amplifier and a Sagnac loop: principles of operation

In this paper we investigate the wavelength conversion and regeneration properties of a tunable all-optical signal regenerator (TASR). In the TASR, the wavelength conversion is done by a semiconductor optical amplifier, which is incorporated in an asymmetric Sagnac loop (ASL). We demonstrate both theoretically and experimentally that the ASL regenerates the incident signals bit pattern, reduces its noise, increases the extinction ratio (which in many aspects is equivalent to noise reduction) and improves its bit-error rate. We also demonstrate the general behavior of the TASR with a numerical simulation.

Single and multiple channel operation dynamics of linear quantum-dot semiconductor optical amplifier

Ultra linear quantum-dot semiconductor optical amplifiers at 1.3 mum provide high dynamic input power range for single and multiple channels with error-free amplification. Good burst-mode tolerance is observed.

Optical grooming switch with regenerative functionality for transparent interconnection of networks

We demonstrate a regenerative optical grooming switch for buffer-less interconnection of metro/access and metro/core ring networks with switching functionality in time, space and wavelength domain. Key functionalities of the router are the traffic aggregation with time-slot interchanging (TSI) functionality, the WDM-to-ODTM multiplexing and the OTDM-to-WDM demultiplexing of high-speed channel into lower bit-rate tributaries as well as multi-wavelength all-optical 2R regeneration of several higher-speed signals. BER and Q-factor measurements of different switching scenarios show excellent performance with no error floor and Q-factors above 21 dB.

Transparent Ring Interconnection using Multi-Wavelength Processing Switches

Summary form only given. The talk will introduce the activities of the IST EU FP6 STREP project TRIUMPH (transparent ring interconnection using multi-wavelength photonic switches). It will focus on the use of advanced optical signal regeneration subsystems that enable novel optical networking concepts such as transparent ring interconnection at high bit rates (up to 160 Gb/s). The presentation will aim to reveal the possible configurations and associated performance of an optical cross connect that will offer multiwavelength regeneration and WDM to OTDM and OTDM to WDM conversion.

2R/3R optical grooming switch with time-slot interchange

We demonstrate a regenerative optical grooming switch for interconnecting 130 Gbit/s and 40 Gbit/s networks with switching functionality in time, space and wavelength domain. Q-factors are above 21 dB.

10 Gbit/s optical wavelength converter with a Brillouin scattering-based spectral filter

For the first time, to our knowledge, a highly robust, high-bit-rate (10 Gbit/s) wavelength converter that is based on a narrow Brillouin filter is reported. The conversion takes place in a semiconductor optical amplifier (SOA) in a cross-gain-phase process. The SOA operates in a weak-modulation mode, and the exiting signal undergoes a dc reduction with a narrow spectral filter. In our system we perform spectrally narrow filtering by using a long Brillouin grating.

An all-optical grooming switch with regenerative capabilities

A regenerative optical grooming switch for interconnecting 130 Gbit/s and 40 Gbit/s networks with switching functionality in time, space and wavelength domain is demonstrated. Lab and field demonstrations show the feasibility of the new concept developed by the TRIUMPH project consortia. Q-factors above 20 dB are reported.