10 and 20 Gb/s all-optical RZ to NRZ modulation format and wavelength converter based on nonlinear optical loop mirror |
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Authors: | Pavel Honzatko Miroslav Karásek |
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Institution: | a Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, v.v.i., Chaberska 57, 182 51 Prague 8, Czech Republic b CESNET, a.l.e., Zikova 4, Prague 6, Czech Republic |
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Abstract: | We present experimental and theoretical results on all-optical 10 and 20 Gb/s RZ to NRZ modulation format and wavelength converter based on a nonlinear optical loop mirror (NOLM). A vector model of converter was developed and the shape of converted pulses was found analytically for particular choice of polarization states. In the experiment, non-zero dispersion shifted fiber with a length 1200 m was used as a nonlinear medium. Pulses from a 10 GHz mode-locked semiconductor laser diode were modulated to form pseudorandom RZ signal and eventually time division multiplexed to 20 Gb/s. RZ pulses were subsequently converted to NRZ signal. The performance of the converter was evaluated experimentally using the data communication analyzer and bit error ratio tester. |
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Keywords: | RZ-to-NRZ format conversion Wavelength conversion Nonlinear optical loop mirror |
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