Impact of in-band crosstalk and amplified spontaneous emission noise in differentially phase-shift keying signal

Chul Han Kim

doi:10.1117/1.OE.56.9.096113

28 September 2017 Impact of in-band crosstalk and amplified spontaneous emission noise in differentially phase-shift keying signal

Chul Han Kim

Author Affiliations +

Funded by: National Research Foundation of Korea (NRF)

Optical Engineering, Vol. 56, Issue 9, 096113 (September 2017). https://doi.org/10.1117/1.OE.56.9.096113

Abstract

The relative impact of in-band crosstalk and amplified spontaneous emission (ASE) noise on a system’s performance has been investigated with a differentially phase-shift keying signal. I have first measured an ASE noise-induced penalty without any in-band crosstalk and then estimated the system’s penalty with a simple addition of the measured ASE noise-induced penalty and the calculated in-band crosstalk-induced penalty. Using this approach, the estimated penalty agreed well with a measured system penalty when the Q value was 3 or an optical signal-to-noise ratio (OSNR) of the signal was higher than 30 dB at Q=6. To estimate the system penalty with a low OSNR level at Q=6, an addition of signal-ASE and signal-in-band crosstalk beat noises were added with a weighting factor. Based on this approach, a discrepancy between the estimated and the measured penalties was reduced drastically with an OSNR of 20 dB at Q=6. However, a small discrepancy was still observed even with the weighted addition of two beat noises. Thus, I have confirmed that the effect of in-band crosstalk–in-band crosstalk beat noise should be taken into account for the proper estimation of a system penalty with an OSNR of <30 dB at Q=6.

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Chul Han Kim "Impact of in-band crosstalk and amplified spontaneous emission noise in differentially phase-shift keying signal," Optical Engineering 56(9), 096113 (28 September 2017). https://doi.org/10.1117/1.OE.56.9.096113

Received: 26 May 2017; Accepted: 11 September 2017; Published: 28 September 2017

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KEYWORDS

Interference (communication)

Phase shift keying

Signal to noise ratio

Receivers

Optical amplifiers

Single mode fibers

Modulation

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