Investigation of transmission performance of 40-gb/s conventional DCS-RZ signals and DCS-RZ signals generated from phase-modulated duobinary signals |
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| Authors: | Yonghoon Kim Jang H. Hur S. Tae Won Oh Young Sik Kim Jichai Jeong |
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| Affiliation: | Dept. of Radio Eng., Korea Univ., Seoul, South Korea; |
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| Abstract: | A 40-Gb/s duobinary carrier-suppressed return-to-zero (DCS-RZ) signal format generated from phase-modulated (PM) duobinary signals by using a phase modulator and an external intensity modulator is proposed. The transmission performance of the proposed DCS-RZ format is theoretically investigated. The proposed DCS-RZ format can produce a signal bandwidth similar to that produced by the conventional DCS-RZ format generated from conventional duobinary signals using low-pass filters. However, the receiver sensitivities of the proposed DCS-RZ format can be improved by about 2 dB more than those of the conventional DCS-RZ format due to high extinction ratio and nonlinear tolerance. Due to a short pulse of the proposed DCS-RZ format, the tolerance of the first-order polarization mode dispersion (PMD) for the format can be improved by about 1 dB up to the differential-group-delay (DGD) value of 16 ps. |
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