Abstract
This paper presents a time-domain traveling-wave algorithm for the modeling of the large-signal dynamic response of a distributed feedback laser integrated with a Mach-Zehnder (MZ) modulator. The influence of residual optical feedback from the output of the modulator facet on the dynamic frequency chirp is studied. It is found that the difference in frequency chirp between the turn-on and -off states (i.e., adiabatic chirp) of a π/2-shifted 2 × 2 MZ modulator is minimal and is independent of the residual optical feedback. In addition, it can be shown that the presence of chirped frequency spikes (i.e., transient chirp), due to the change in refractive index as a result of the rapid variation of the bias voltage, can broaden the linewidth and distort the spectrum of the modulated optical signal. Furthermore, the possibility of doubling the modulation frequency of MZ modulators using a dual-arm dual-signal modulation format is investigated.
| Original language | English |
|---|---|
| Pages (from-to) | 1062-1074 |
| Number of pages | 13 |
| Journal | IEEE Journal of Quantum Electronics |
| Volume | 38 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 1 Aug 2002 |
| Externally published | Yes |
Keywords
- Distributed feedback lasers
- Frequency chirp
- Large-signal modulation
- Mach-Zehnder modulators
- Monolithic integration
- Numerical simulation
- Optical feedback
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering