Abstract
Feature Issue on Optical Performance Monitoring (OPM). Chromatic dispersion
(CD) in optical single-mode fibers, i.e., the wavelength dependence of the
propagation delay, distorts pulses and is a big problem in 10- and 40-Gbit/s
transmission systems. Adjustable drop-in CD compensators require an online CD
detection. For this purpose, we modulate the optical power of the laser in a
40-Gbit/s transmitter by 1.2% (rms) at a frequency of 5 MHz. In the presence of CD,
the associated periodic optical frequency variation modulates the signal arrival
time, which is measured by synchronous (lock-in) detection of an error signal in the
clock recovery of the receiver. CD as large as -268 to +350 ps/nm is detected
including its sign, more than by any comparable technique. The uncertainty of
measured arrival-time modulations can be as low as 100 attoseconds. Moreover, no
extra optics or high-frequency electronics are needed, which makes this method
extremely cheap to implement. Results are given for nonreturn to zero and
carrier-suppressed return to zero (CSRZ), intensity modulation, and differential
phase-shift keying.
© 2003 Optical Society of America
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