1 December 2004 Chirp compensating in long haul optical links by means of self-phase modulation and real-time feedback
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Optical Engineering, 43(12), (2004). doi:10.1117/1.1814359
Abstract
A new method for chromatic dispersion compensation based on a real-time chirp feedback is presented. The method makes use of an optical channel modulated at 10 Gbits/s by an external modulated transmitter using a nonreturn to zero (NRZ) in the nonlinear regime. The signal undergoes self-phase modulation (SPM) effect. An optical filter, which is used as an optical frequency discriminator, is located at the end of the link and serves for measuring the time-resolved frequency chirp in the transmitter. We show that by measuring the chirp in real time and controlling the SPM effect, we can manage the amount of chromatic dispersion to be compensated. This control process enables us to reduce the system path penalty to a value close to 0 dB and thus achieve a dramatic improvement in the system bit error rate (BER).
Ilan Landesman, Uri Mahlab, Shlomo Ruschin, "Chirp compensating in long haul optical links by means of self-phase modulation and real-time feedback," Optical Engineering 43(12), (1 December 2004). http://dx.doi.org/10.1117/1.1814359
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KEYWORDS
Scanning probe microscopy

Modulation

Dispersion

Transmitters

Optical amplifiers

Modulators

Laser stabilization

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