Patterning effect at 40 Gbit/s of wavelength converter utilizing cross-phase modulation in InGaAsP/InP electroabsorption modulator

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

doi:10.1109/iciprm.2003.1205348

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…An EAM possesses faster absorption recovery time (i.e., less than 10 ps) and also experiences reduced chirp on the output signal (ideally zero or negative) as compared to other optical devices (e.g., semiconductor optical amplifiers) [20][21][22][23]. Furthermore, it has been suggested that an EAM is (theoretically) capable of handling tera-hertz modulation rates [24].…”

Section: Introductionmentioning

confidence: 97%

Chirp Control of an Electroabsorption Modulator to be used for Regeneration and Wavelength Conversion at 40 Gbit/s in All-Optical Networking

Jamro

Senior

2005

Photon Netw Commun

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Chirp control to produce low or negative values of chirp at the output of an electroabsorption modulator (EAM) is an important mechanism for reducing the signal degradation due to chromatic dispersion in high-speed transmission over standard single-mode fibre. An analytical model for the chirp performance of an EAM capable of optical regeneration and simultaneous wavelength conversion operating at 40 Gbit/s is derived. A chirp control approach is identified using this model by exploring the tradeoff between the α-parameter describing the chirp factor (based on the nonlinear absorption coefficients) and bias voltage requirements of an EAM. In particular, an optimum range of bias voltage is determined to ensure reduced chirp operation when a two-tone signal (i.e., comprised of bias and modulating voltages) is applied to the EAM. It is also demonstrated for large signal operation at 40 Gbit/s that the optimum range of reverse bias voltage is between 0 and 2 V to obtain low values for the chirp factor (between +1 and −2) in order to facilitate the necessary chirp control in all-optical networking. In addition, it is identified that at 40 Gbit/s higher positive values of the second-and third-order nonlinear coefficients of chirp must be avoided when operating at reverse bias voltages less than 1 V.

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Section: Introductionmentioning

confidence: 97%

Chirp Control of an Electroabsorption Modulator to be used for Regeneration and Wavelength Conversion at 40 Gbit/s in All-Optical Networking

Jamro

Senior

2005

Photon Netw Commun

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“…Chirp control of EAM is desirable for high-speed optical networks where chirp compensation before the demultiplexing can make the network more robust [7]. The occurrence of chirp in an EAM is a mainly dependent on the bias voltage [15] and an optimised value of the bias voltage can improve the performance of the device so that it exhibits negative or zero chirp.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, various optical network applications such as very-short-reach, long-reach and long-haul network functionalities [2] based on cross-absorption modulation (XAM) have been demonstrated, that include pulse generation [3], multiplexing [4] and demultiplexing [5]. EAMs are considered as suitable devices for optical networking applications as they possess fast absorption recovery that can be less than 10 ps [6] as compared to the slow gain recovery of the semiconductor optical amplifiers [7]. Such high-speed operation is required for optical regeneration with simultaneous wavelength conversion.…”

Section: Introductionmentioning

confidence: 99%

Optimising negative chirp of an electroabsorption modulator for use in high‐speed optical networks

Jamro

Senior

2006

Trans Emerging Tel Tech

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SUMMARYOptical networks using singlemode fiber rely on negative chirp to improve the transmission performance. In particular for an electroabsorption modulator (EAM) optimal chirp control is required when it is used to achieve various network functions in high-speed optical networks. An approach to modelling the negative chirp for the EAM is presented that is suitable to apply to a cross-absorption modulation scheme. A novel feature of this modelling process is that it allows cubic polynomials to incorporate the nonlinear coefficients of chirp describing the a-parameter related to the nonlinear transmission coefficients. In addition to the twotone signal parameters (i.e. bias and modulating signal voltages), the model also includes wavelengthtemperature-dependent absorption variation and the effects associated with the length of the device. It therefore enables accurate determination for the values of the nonlinear coefficients of the chirp responsible for the negative chirp of an EAM. Using this model an optimised range of AE 0.5 is obtained for the nonlinear coefficients of the chirp to exhibit negative chirp for specific values of nonlinear transmission coefficients (within a range of À10 and 2) at a reverse bias voltage of less than 2 V. Since negative chirp optimisation of an EAM can minimise the unwanted effects of dispersion on a singlemode fiber in highspeed optical networks an improvement of performance without employing expensive dispersion compensation management techniques can be achieved.

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“…All-optical implementation of wavelength conversions is very promising due to its ability of ultrahigh-speed operations. So far, several schemes have been reported to realize all-optical wavelength conversions by exploiting optical nonlinearities in, for example, semiconductor optical amplifiers (SOAs) [3,5,6], electro-absorption modulators (EAMs) [7], periodically poled lithium niobate (PPLN) waveguide [8], chalcogenide glass rib waveguide [9,10], passive GaAs-AlGaAs waveguide [11], Si nanowire [12,13] and various optical fibers [1,[14][15][16][17][18][19][20][21][22], respectively. Nevertheless, these schemes can have their individual advantages and also have their respective drawbacks in terms of operational speed, wavelength range, manufacturing cost, system complexity and physical size of the resulting wavelength converters.…”

Section: Introductionmentioning

confidence: 99%

Design of polarity-preserved or polarity-inverted wavelength converters using cross-phase modulation in a highly nonlinear photonic crystal fiber with flat dispersion

Zou¹,

Zhang²

2012

J. Opt.

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In this paper, we propose the design of tunable and robust wavelength converters which can perform the polarity-preserved or polarity-inverted wavelength conversion by using the cross-phase modulation (XPM) in a dispersion-flattened highly nonlinear photonic crystal fiber (DF-HNL-PCF). The newly designed wavelength converter consists of a DF-HNL-PCF and an optical band-pass filter in the simple straight-line configuration, where XPM leads to broadening the spectrum of a continuous-wave probe light and the polarity-preserved, tunable wavelength conversion is then implemented by filtering out the blue-chirped or red-chirped spectral component of a probe light. The experimental results show that the polarity-preserved wavelength converter using a DF-HNL-PCF can achieve the error-free conversion of 10 Gbit s−1 optical data signals with the maximum power penalty of less than 2.1 dB over a wavelength range of nearly 34 nm. This wavelength tunability is actually limited by an operational wavelength range of the tunable optical band-pass filter that is used to extract the wavelength-converted signal in our experiment. Moreover, the polarity-inverted wavelength conversion is observed at the XPM-based wavelength converter using a DF-HNL-PCF, for the first time. This is achieved by tuning the central wavelength of an optical band-pass filter to coincide with that of a chirped probe light.

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Patterning effect at 40 Gbit/s of wavelength converter utilizing cross-phase modulation in InGaAsP/InP electroabsorption modulator

Cited by 6 publications

References 3 publications

Chirp Control of an Electroabsorption Modulator to be used for Regeneration and Wavelength Conversion at 40 Gbit/s in All-Optical Networking

Chirp Control of an Electroabsorption Modulator to be used for Regeneration and Wavelength Conversion at 40 Gbit/s in All-Optical Networking

Optimising negative chirp of an electroabsorption modulator for use in high‐speed optical networks

Design of polarity-preserved or polarity-inverted wavelength converters using cross-phase modulation in a highly nonlinear photonic crystal fiber with flat dispersion

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