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Measurement of carrier-density mediated intermodulation distortion in an optical amplifier

Measurement of carrier-density mediated intermodulation distortion in an optical amplifier

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© The Institution of Electrical Engineers
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We measured intermodulation distortion (IMD) generated by the presence of two optical tones separated by up to 1 GHz in a 1.3μm near-travelling-wave optical amplifier. The measured distortion agrees with calculations of third-order nonlinearity caused by carrier-density modulation. The third-order intercept of 5dBm may be more restrictive in closely spaced frequency-multiplexed systems than gain saturation.

Inspec keywords: intermodulation measurement; amplifiers; carrier density; optical modulation; semiconductor junction lasers; optical communication equipment

Other keywords: 1.3 micron; semiconductor lasers; optical communication equipment; carrier-density modulation; third-order nonlinearity; closely spaced frequency-multiplexed systems; 1 GHz; intermodulation distortion; two optical tones; near-travelling-wave optical amplifier

Subjects: Optical communication; Electromagnetic compatibility and interference; Semiconductor lasers

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