Experimental investigations of 3-D-/4-D-CAP modulation with directly modulated VCSELs
In this letter, we present experimental investigations of multidimensional multilevel carrierless amplitude phase (CAP) modulation with directly modulated vertical cavity surfaceemitting lasers. The signals are transmitted over 20 km of standard single-mode fiber (SSMF). For multilevel 3-D-CAP, bit...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Published: |
IEEE
2012
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1109/LPT.2012.2217811 http://dx.doi.org/10.1109/LPT.2012.2217811 http://eprints.uthm.edu.my/6096/1/Experimental_Investigations_of_3%2DD.pdf |
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| Summary: | In this letter, we present experimental investigations
of multidimensional multilevel carrierless amplitude phase (CAP)
modulation with directly modulated vertical cavity surfaceemitting
lasers. The signals are transmitted over 20 km of
standard single-mode fiber (SSMF). For multilevel 3-D-CAP,
bit rates of 468.75 and 937.5 Mb/s are achieved at two
levels/dimension and four levels/dimension, respectively. For
4-D-CAP, bit rates of 416.67 and 833.3 Mb/s are achieved at two
levels/dimension and four levels/dimension, respectively. For all
signals, a bit-error rate below the forward error correction limit
of 2.8 × 10−3 for error-free reception is achieved after 20 km of
SSMF transmission. Spectral efficiencies of 2.68 and 2.08 b/s/Hz
are reported for 3-D-CAP and 4-D-CAP, respectively. We believe
that multidimensional modulation formats represent an attractive
solution for providing more flexibility for optical fiber systems. |
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