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ABSTRACT: 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 2×2 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 2×2 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.
Journal of Lightwave Technology 03/2005; 23(2):732- 739. · 2.78 Impact Factor
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T. Houbavlis,
K.E. Zoiros, M. Kalyvas,
G. Theophilopoulos,
C. Bintjas,
K. Yiannopoulos,
N. Pleros,
K. Vlachos,
H. Avramopoulos,
L. Schares,
L. Occhi,
G. Guekos,
J.R. Taylor,
S. Hansmann,
W. Miller
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ABSTRACT: This paper reviews the work performed under the European ESPRIT project DO_ALL (Digital OpticAL Logic modules) spanning from advanced devices (semiconductor optical amplifiers) to all-optical modules (laser sources and gates) and from optical signal processing subsystems (packet clock recovery, optical write/store memory, and linear feedback shift register) to their integration in the application level for the demonstration of nontrivial logic functionality (all-optical bit-error-rate tester and a 2×2 exchange-bypass switch). The successful accomplishment of the project's goals has opened the road for the implementation of more complex ultra-high-speed all-optical signal processing circuits that are key elements for the realization of all-optical packet switching networks.
Journal of Lightwave Technology 03/2005; · 2.78 Impact Factor
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ABSTRACT: All-optical shift registers are basic building modules for the development of ultra-high speed optical time division multiplexing networks. In this paper, we review the progress that has been made in this cutting-edge technology, focusing on implementations that exploit the attractive features of semiconductor optical amplifier (SOA)-based interferometric configurations. We present regenerative storage performed with an all-optical recirculating shift register with an inverter at 10 Gb/s using a SOA-assisted Sagnac switch and a second SOA to provide feedback. We demonstrate also an all-optical memory based on the SOA-assisted Ultrafast Nonlinear Interferometer capable of reading/writing 20 Gb/s packets of variable length without data inversion. These registers can find application in the development of two nontrivial complex all-optical circuits of enhanced functionality. The first is an all-optical pseudorandom binary sequence generator for which we describe an efficient design algorithm and propose ways for monitoring and verification. The second is an all-optical error counter for which we address the error detection and evaluation issues using a novel sampling technique. These circuits are key elements for the implementation of a high-speed, all-optical bit error rate tester (BERT), which has the potential to outperform its electronic equivalent and constitute a possible new product for the telecommunications industry.
Optical and Quantum Electronics 08/2004; 36(11):1005-1053. · 0.82 Impact Factor
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ABSTRACT: All-optical gate control signal generation is demonstrated from flag pulses, using a Fabry-Pe´rot filter followed by a semiconductor optical amplifier. Ten control pulses are generated from a single flag pulse having less than 0.45-dB amplitude modulation. By doubling or tripling the number of flag pulses, the number of control pulses increases approximately by a factor of two or three. The circuit can control the switching state of all-optical switches, on a packet-by-packet basis, and can be used for nontrivial network functionalities such us self-routing.
IEEE Photonics Technology Letters 05/2004; · 2.19 Impact Factor
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ABSTRACT: The generation of crosstalk in wavelength division multiplexed cable television (WDM-CATV) networks due to fiber-induced nonlinearities
is studied, both theoretically and experimentally. For the first time, to our knowledge, the contribution of electrostriction
to the generated crosstalk level in such systems is included in an analytical model. The critical parameters of the system
are defined and analyzed and their impact on the formation of the nonlinear crosstalk is examined. The comparison between
the theoretical results and the experimental data reveals very good agreement and has allowed the optimization of the performance
of the system in terms of its critical parameters. For fixed channel numbers, twofold reduction in channel spacing increases
the crosstalk by 3 dB/ch. For fixed channel spacing, doubling the number of channels results in 1 dB/ch crosstalk increase.
Optical and Quantum Electronics 03/2004; 36(5):413-430. · 0.82 Impact Factor
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ABSTRACT: An all-optical address and data separation scheme is presented for short 10-Gb/s packets. The technique uses a novel packet clock recovery circuit that consists of a Fabry-Perot filter and a ultrafast nonlinear interferometer (UNI) gate to generate a local packet clock. A second cascaded UNI gate is used to separate the header and the payload, performing a simple AND operation between the packet and its self-derived clock. The proposed technique requires a small number of bits as guard band and this number is independent of the line rate.
IEEE Photonics Technology Letters 01/2003; · 2.19 Impact Factor
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ABSTRACT: We present all-optical address and data separation for 10 Gb/s cells. The technique uses a novel packet clock recovery circuit to generate the local signal and an optical gate to extract header and payload.
Optical Communication, 2002. ECOC 2002. 28th European Conference on; 10/2002
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ABSTRACT: 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.
IEEE Photonics Technology Letters 10/2002; · 2.19 Impact Factor
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ABSTRACT: In this letter, we demonstrate an optically addressable 2 /spl times/ 2 exchange-bypass switch operating with 10-Gb/s data packets. Switching is achieved at the bit level using an ultrafast nonlinear interferometer gate with two input data signals and a single control signal. The bit error rate of the switch in a static configuration was estimated to be 10/sup -11/ using synchronous digital hierarchy 64 data frames.
IEEE Photonics Technology Letters 08/2002; · 2.19 Impact Factor
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ABSTRACT: 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.
IEEE Photonics Technology Letters 06/2002; · 2.19 Impact Factor
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ABSTRACT: In summary, we have demonstrated a simple and stable, multi-wavelength laser source. It combines two semiconductor optical amplifiers and a fiber Fabry-Perot filter to generate 52 simultaneously oscillating wavelengths across 21 nm with a flat output spectrum. The power equalization and the broadening of the oscillating spectrum was achieved by means of adjusted, single-pass optical feedback of its output back into the source. The power standard deviation between the lines is less than 0.3 dB, the extinction between them was greater than 32 dB and their linewidth was calculated to be 500 MHz. The source may be useful as a relatively inexpensive source for passive and active component characterization.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
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ABSTRACT: An all-optical clock recovery unit is demonstrated at 10 Gbps, appropriate for use with short optical packets. The circuit uses a Fabry-Perot etalon and a UNI gate and achieves clock recovery within a few bits.
All-Optical Networking: Existing and Emerging Architecture and Applications/Dynamic Enablers of Next-Generation Optical Communications Systems/Fast Optical Processing in Optical Transmission/VCSEL and Microcavity Lasers. 2002 IEEE/LEOS Summer Topi; 02/2002
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ABSTRACT: We demonstrate an optically addressable 2×2 exchange-bypass switch operating with 10 Gbps data packets. Switching is achieved in an optical amplifier gate and the performance of the device is independent of packet length and content.
All-Optical Networking: Existing and Emerging Architecture and Applications/Dynamic Enablers of Next-Generation Optical Communications Systems/Fast Optical Processing in Optical Transmission/VCSEL and Microcavity Lasers. 2002 IEEE/LEOS Summer Topi; 02/2002
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ABSTRACT: We present an all-optical clock recovery circuit for data packets at 10 Gbps. The circuit uses a Fabry-Perot filter and a UNI gate and acquires clock within a few bits
Optical Communication, 2002. ECOC 2002. 28th European Conference on; 02/2002
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ABSTRACT: 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.
Optical Fiber Communication Conference and Exhibit, 2001. OFC 2001; 02/2001
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G. Theophilopoulos,
K. Yiannopoulos, M. Kalyvas,
C. Bintjas,
G. Kalogerakis,
H. Avramopoulos,
L. Occhi,
L. Schares,
G. Guekos,
S. Hansmann,
R. Dall'Ara
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ABSTRACT: 40 GHz Boolean XOR is demonstrated using an ultrafast nonlinear interferometer (UNI) gate. The gate operates with low switching energy and signals from the same source. It may be used in networking applications without wavelength conversion.
Optical Fiber Communication Conference and Exhibit, 2001. OFC 2001; 02/2001
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ABSTRACT: Simultaneous oscillation of 50 wavelengths, spaced at 50 GHz, is demonstrated from a stable Fabry-Perot ring laser source that uses two semiconductor optical amplifiers. Power variation between channels is less than 1.6 dB.
Optical Communication, 2001. ECOC '01. 27th European Conference on; 02/2001
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ABSTRACT: 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.
IEEE Photonics Technology Letters 08/2000; · 2.19 Impact Factor
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ABSTRACT: A writable all-optical memory for variable length, 20 Gbit/s data
packets is demonstrated. The memory uses an ultrafast nonlinear
interferometer (UNI) gate and does not perform data inverting in each
pass. Regenerative storage with low switching energies is verified
Electronics Letters 07/2000; · 0.96 Impact Factor
