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Error free all optical wavelength conversion in highly nonlinear As-Se chalcogenide glass fiber

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Abstract

We present the first demonstration of all optical wavelength conversion in chalcogenide glass fiber including system penalty measurements at 10 Gb/s. Our device is based on singlemode As2Se3 chalcogenide glass fiber which has the highest Kerr nonlinearity (n2) of any fiber to date for which either advanced all optical signal processing functions or system penalty measurements have been demonstrated. We achieve wavelength conversion via cross phase modulation over a 10 nm wavelength range near 1550 nm with 7 ps pulses at 2.1 W peak pump power in 1 meter of fiber, achieving only 1.4 dB excess system penalty. Analysis and comparison of the fundamental fiber parameters, including nonlinear coefficient, two-photon absorption coefficient and dispersion parameter with other nonlinear glasses shows that As2Se3 based devices show considerable promise for radically integrated nonlinear signal processing devices.

©2006 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Principle of XPM wavelength conversion. Amplified pulsed pump signal (at λ1) imposes a nonlinear frequency chirp onto a co-propagating wavelength tunable CW probe (at λ2) through the nonlinear refractive index. Filtering one of the XPM generated sidebands results in wavelength conversion (to λ2+Δ).
Fig. 2.
Fig. 2. System setup for demonstrating wavelength conversion. CLK: 10 GHz actively mode locked, fiber laser, FBG notch: fiber Bragg grating notch filter, MZ: Mach-Zehnder modulator, PC: polarization controlled, PRBS: pseudo-random bit sequence, TBF: tunable band pass filter.
Fig. 3.
Fig. 3. Spectra from As2S3 fiber after XPM has broadened the spectra of three different CW probe wavelengths. Resolution bandwidth = 60 pm.
Fig. 4.
Fig. 4. BER vs. received optical power showing ~1.4 dB penalty at BER = 10-9 for wavelength conversion over 10 nm compared to the back-to-back (B2B) system measurement. For clarity, the linear regression for conversion at 1555.57 nm and 1559.61 nm are not shown here. Inset shows eye diagrams (10 ps per division) for B2B and converted pulses.
Fig. 5.
Fig. 5. (a) Analysis of intensity required to generate a nonlinear phase shift of π by XPM vs. pump-probe wavelength offset for varying FOM. (b) The gradient of (a) vs. FOM. The dotted line designates the FOM = 1 threshold required for efficient device operation.

Tables (1)

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Table 1. Comparison of optical parameters of Silica DSF, Bi2O3 fiber and As2S3 fiber at 1550 nm

Equations (1)

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I = α β [ exp ( φ NL 2 π FOM ) 1 ] [ 1 exp ( α L W ) ]
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