Eight-Dimensional Polarization-Ring-Switching Modulation Formats

Polarization effects and nonlinear switching in fiber figure-eight lasers.

We have developed a novel experimental procedure that allows us to quantify how polarization effects determine the passive mode locking of an optical fiber figure-eight laser. Based on our measurements, we have performed numerical simulations demonstrating that the nonlinear switching within this laser operates in a manner contrary to that described by the conventional theory of passive mode lo...

Eight-Dimensional Modulation for Coherent Optical Communications

We propose several 8-dimensional modulation formats for coherent fiber-optic communications. For spectral efficiencies of 1.75 and 2 b/s/Hz/pol, the proposed modulations offer up to 1 dB gain over DP-QPSK. European Conference and Exhibition on Optical Communication (ECOC) This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in ...

Comparison of Optical Modulation Formats

Optimization of OADM DWDM Ring Optical Network using Various Modulation Formats

In this paper, the performance of the ring optical network is analyzed at bit rate 2.5 Gbps and 5 Gbps for various modulation formats such as NRZ rectangular, NRZ raised cosine, RZ soliton, RZ super Gaussian, RZ raised cosine and RZ rectangular. The effect of insertion losses is analyzed. It is observed that RZ Soliton performs better than all other formats and using this scheme system can exis...

Conversions among binary optical modulation formats.

We study the intrinsic relations and conversions among different binary modulation formats such as non-return-to-zero (NRZ), return-to-zero (RZ), carrier-suppressed return-to-zero (CSRZ), differential-phase-shift-keying (DPSK), duobinary, and alternate-mark-inversion (AMI). In particular, we experimentally demonstrate the new conversion from CSRZ to duobinary using a Mach-Zehnder delay interfer...