First demonstration of simultaneous demultiplexing from 80 Gb/s to 2×40 Gb/s by SOA-based all-optical polarization switch

Tsurusawa, M.; Nishimura, K.; Usami, M.

doi:10.1109/ecoc.2001.989077

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…is therefore possible to achieve simultaneous demultiplexing by extracting both the polarization-switched and non-switched outputs of the UNI through a polarization beam splitter (PBS) with no power sacrifice. [35,36] A large saving in power can be expected in this method compared to conventional switching gate demultiplexing such as with an electroabsorption modulator gate, because the switching gate demultiplexing method requires an intrinsic power splitting loss. The experimental setup for a simultaneous optical demultiplexing using the UNI consisting of two polarization-maintaining fibers as a birefringent devices and an SOA is shown in Fig.…”

Section: Simultaneous Demultiplexing From 80 Gbit/s To 2 Channels Of mentioning

confidence: 99%

Optical nonlinearities in semiconductor optical amplifier and electro-absorption modulator: their applications to all-optical regeneration

Usami

Nishimura

2005

J Optic Comm Rep

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Semiconductors have large optical nonlinearity with response speed in the several tens of picosecond range, making them ideal use as all-optical regenerators and wavelength converters. We theoretically and experimentally investigated optical nonlinearities induced by carrier dynamics both in forward biased semiconductor waveguide (SOA) and in reverse biased semiconductor waveguide (EAM). We made a detailed theoretical study of carrier dynamics in semiconductor waveguides by using the newly developed time-dependent transfer matrix method. To confirm the simulation results, we propose utilizing a polarization discriminating delayed interferometer (PD-DI) configuration as a simple technique for measuring optical nonlinearities such as cross gain modulation (XGM), cross absorption modulation (XAM), and cross phase modulation (XPM). In the first part of the paper, we reviewed SOA-based regenerators. As expected from the simulation results, we confirmed that injection of the transparent assist light was very effective in reducing of the SOA gain recovery time of down to a few tens of picoseconds. We further demonstrated 40 Gbit/s regeneration using an SOA-one-arm MZI (so-called UNI) configuration. The superior regeneration capability of two-stage UNI was successfully confirmed by a recirculating loop experiment up to 30,000 km with 150 regenerations. In the latter part of the paper, we reviewed all-optical regenerators using EAM. A bit-synchronized rf-driven XAM 3R regenerator consisting of only one EAM for both gating and timing correction was demonstrated at 20 Gbit/s. An EAM in conjunction with delayed interferometer configuration, which utilizes XPM as well as XAM in the EAM, has structurral simplicity and fast regeneration operability up to 100 Gbit/s. The fast response of EAM allows the optical regeneration with a small pattern word effect. 498Masashi Usami and Kohsuke Nishimura

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Section: Simultaneous Demultiplexing From 80 Gbit/s To 2 Channels Of mentioning

confidence: 99%

Optical nonlinearities in semiconductor optical amplifier and electro-absorption modulator: their applications to all-optical regeneration

Usami

Nishimura

2005

J Optic Comm Rep

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“…The UNI gate is a very promising switching device, because it is a balanced single-arm interferometer and its structure compensates for the long-lived nonlinearities of the SOA [11] and allows for its cascadability [19]. For the XOR logic operation, three optical signals are used as inputs into the gate: control signals A and B and clock signal CLK.…”

Section: B All-optical Logic Modulesmentioning

confidence: 99%

“…These subsystems span from simple optical power supply modules and Boolean logic circuits up to complex routing/switching systems. Within this context, serious effort 0733-8724/03$17.00 © 2003 IEEE has been invested during the past few years in the development of optical interferometric gates [6]- [12] with Boolean logic capability [13]- [19], short-pulse, high-repetition-rate laser sources [20]- [29], and clock-recovery circuits [31]- [38] for extracting the timing information required at each network node. Going one step further, optical shift registers [39]- [42] with read/write capability [41], [42], optical packet buffers [43], optical flip/flops [44], exchange-bypass switches [45], header separation and recognition techniques [46]- [51], as well as self-routing switches [52], [53] have been successfully demonstrated, and these are only a small part of the progress made up to now in the field.…”

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confidence: 99%

Ultrafast time-domain technology and its application in all-optical signal processing

Vlachos¹,

Pleros

Bintjas

et al. 2003

J. Lightwave Technol.

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Abstract-In this paper, we review recent advances in ultrafast optical time-domain technology with emphasis on the use in optical packet switching. In this respect, several key building blocks, including high-rate laser sources applicable to any time-division-multiplexing (TDM) application, optical logic circuits for bitwise processing, and clock-recovery circuits for timing synchronization with both synchronous and asynchronous data traffic, are described in detail. The circuits take advantage of the ultrafast nonlinear transfer function of semiconductor-based devices to operate successfully at rates beyond 10 Gb/s. We also demonstrate two more complex circuits-a header extraction unit and an exchange-bypass switch-operating at 10 Gb/s. These two units are key blocks for any general-purpose packet routing/switching application. Finally, we discuss the system perspective of all these modules and propose their possible incorporation in a packet switch architecture to provide low-level but high-speed functionalities. The goal is to perform as many operations as possible in the optical domain to increase node throughput and to alleviate the network from unwanted and expensive optical-electrical-optical conversions.Index Terms-Exchange-bypass switch, interferometric gates, optical switching, optical time-division multiplexing (OTDM), packet switching, optical signal processing, semiconductor optical amplifier (SOA).

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“…Both AND-gates and XOR-comparators are important to build complex optical circuits like binary adders [29], address recognition schemes [17]- [22], data encoders/decoders, or optical decision circuits [6]. Digital AND is the most common Boolean function and has been used in demultiplexing of optical time-division multiplexing (OTDM) signals [30], [31], and wavelength conversion [32], [33], as well as 3R-regeneration [34]. For such operations, the UNI is a very promising candidate, because its balanced structure compensates for the long-lived nonlinearities of the SOA [10] and allows for its cascadability [31].…”

Section: A And/xor Boolean Logic Circuitsmentioning

confidence: 99%

“…Digital AND is the most common Boolean function and has been used in demultiplexing of optical time-division multiplexing (OTDM) signals [30], [31], and wavelength conversion [32], [33], as well as 3R-regeneration [34]. For such operations, the UNI is a very promising candidate, because its balanced structure compensates for the long-lived nonlinearities of the SOA [10] and allows for its cascadability [31]. All-optical bitwise AND and XOR logic using the SOA-assisted UNI gate has been reported so far up to 100 [11] and 20 Gb/s [12], respectively.…”

Section: A And/xor Boolean Logic Circuitsmentioning

confidence: 99%

Ultrafast nonlinear interferometer (UNI)-based digital optical circuits and their use in packet switching

Bintjas

Vlachos²,

Pleros

et al. 2003

J. Lightwave Technol.

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Abstract-Digital optical logic circuits capable of performing bit-wise signal processing are critical building blocks for the realization of future high-speed packet-switched networks. In this paper, we present recent advances in all-optical processing circuits and examine the potential of their integration into a system environment. On this concept, we demonstrate serial all-optical Boolean AND/XOR logic at 20 Gb/s and a novel all-optical packet clock recovery circuit, with low capturing time, suitable for burst-mode traffic. The circuits use the semiconductor-based ultrafast nonlinear interferometer (UNI) as the nonlinear switching element. We also present the integration of these circuits in a more complex unit that performs header and payload separation from short synchronous data packets at 10 Gb/s. Finally, we discuss a method to realize a novel packet scheduling switch architecture, which guarantees lossless communication for specific traffic burstiness constraints, using these logic units.Index Terms-All-optical signal processing, burst-packet traffic, packet switching, ultrafast nonlinear interferometer.

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First demonstration of simultaneous demultiplexing from 80 Gb/s to 2×40 Gb/s by SOA-based all-optical polarization switch

Cited by 7 publications

References 2 publications

Optical nonlinearities in semiconductor optical amplifier and electro-absorption modulator: their applications to all-optical regeneration

Optical nonlinearities in semiconductor optical amplifier and electro-absorption modulator: their applications to all-optical regeneration

Ultrafast time-domain technology and its application in all-optical signal processing

Ultrafast nonlinear interferometer (UNI)-based digital optical circuits and their use in packet switching

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