论文信息 - 4-ary PAM signaling for increasing the capacity of metro light-wave systems

4-ary PAM signaling for increasing the capacity of metro light-wave systems

We investigated both experimentally and by simulation, non-return-to-zero (NRZ) and return-to-zero (RZ) 4-ary PAM operating at 20 Gb/s. A simple scheme to realize the quadratic signal leveling by suitably driving a MZ modulator is proposed, which provides greater than 6 dB improvement in receiver sensitivity as compared to equal level spacing. We experimentally demonstrated NRZ and RZ 10 Gbaud/s 4-ARY PAM transmissions over an 80 km standard single mode fiber (SSMF) link as a proof of concept and more detailed experimental results over longer reach will follow. Numerical simulations for the 4-ary PAM performance over longer distances (>200 km) are also presented.

[1] E. Desurvire,et al. Erbium‐Doped Fiber Amplifiers: Principles and Applications , 1995 .

[2] William J. Dally,et al. A tracking clock recovery receiver for 4-Gbps signaling , 1998, IEEE Micro.

[3] J. Conradi,et al. Multilevel signaling for increasing the reach of 10 Gb/s lightwave systems , 1999 .

[4] G. Keiser. Optical Fiber Communications , 1983 .

[5] A. Bruce Carlson,et al. Communication Systems , 1968 .

[6] T. Lee,et al. A 0.3-/spl mu/m CMOS 8-Gb/s 4-PAM serial link transceiver , 2000, 1999 Symposium on VLSI Circuits. Digest of Papers (IEEE Cat. No.99CH36326).