1997
DOI: 10.1109/50.633589
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All-optical wavelength conversion of NRZ and RZ signals using a nonlinear optical loop mirror

Abstract: Wavelength conversion using a nonlinear optical loop mirror (NOLM) is investigated. Our interest is in considering nonreturn-to-zero (NRZ) and return-to-zero (RZ) signals with a high-duty ratio resulting in a nonlinear phase shift of the counterpropagating wave that is not negligible and reduces the extinction ratio considerably compared to signals with a low-duty ratio. It is shown how the NOLM can be used for high-duty signals anyhow by configuring/adjusting the NOLM, particularly the polarization controller… Show more

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Cited by 29 publications
(14 citation statements)
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References 10 publications
(25 reference statements)
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“…We will demonstrate that also NRZ wavelength conversion based on an NOLM can be realized meaning that wavelength conversion in a NOLM is transparent to RZ and NRZ format. The conclusion in [11] that the nonlinear phase of the counterpropagating waves can be easily compensated just by adjusting the state of the polarization controller in the NOLM, and high ER of the converted signal can be obtained is confirmed by our experimental results. This paper is divided into four sections.…”
supporting
confidence: 75%
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“…We will demonstrate that also NRZ wavelength conversion based on an NOLM can be realized meaning that wavelength conversion in a NOLM is transparent to RZ and NRZ format. The conclusion in [11] that the nonlinear phase of the counterpropagating waves can be easily compensated just by adjusting the state of the polarization controller in the NOLM, and high ER of the converted signal can be obtained is confirmed by our experimental results. This paper is divided into four sections.…”
supporting
confidence: 75%
“…But, owing to the relatively slow carrier recovery time of SOA's ( 1 ns), nonreturn-to-zero (NRZ)-like output signals are obtained when the wavelength conversion is performed in SOA's by XGM or XPM, and this is not suitable for return-to-zero (RZ)-based networks [5]. However, nonlinear optical loop mirror (NOLM) based on silica fiber has the potential of attaining terabits per second switching operation due to the ultrafast optical nonlinearity; our experiments will demonstrate that the pulsewidths can be maintained, and even compressed when the walkoff defined in [11] between the CW waves and the control pulses is small. So, wavelength conversion based on a NOLM will be suitable for RZ based networks.…”
mentioning
confidence: 93%
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“…In this case, the nonlinear phase of the counterpropagating wave will have some effect on the ER of the converted signal. Like nonreturn-to-zero (NRZ), this problem can easily be solved by adjusting the state of polarization controller in the NOLM [11], [14]. In order to obtain a switching efficiency of 1, the peak power of the control pulse should be 242 mW; it means an average power of about 40 mw.…”
Section: Methodsmentioning
confidence: 99%
“…By using and , where is the dispersion parameter, is the wavelength, is the speed of light, and is the dispersion slope, the power difference is given by (see Appendix ) (6) Assuming the nonlinear phase shift of channel 1 is equal to , which could be realized by adjusting the polarization controller [21], the normalized power difference assumes the simple expression (7) If the power difference between these two channels should be smaller than 3 dB, the accumulated dispersion and slope should satisfy (8)…”
Section: Wdm Operationmentioning
confidence: 99%