- Introduction to Optical Design
- Factors That Affect System Design
- Effect of Chromatic Dispersion on Transmission Length and Induced Power Penalty
- Design of a Point-to-Point Link Based on Q-Factor and OSNR
- Calculation of Q-Factor from OSNR
- Margin Requirements
- Design Using Chromatic Dispersion Compensation
- OSNR and Dispersion-Based Design
- Frequency Chirp
- Effects of FWM and XPM on Long-Haul Design
- PMD in Long-Haul Design
- Examples
- Summary
- References
Frequency Chirp
When pulses are generated at the transmitted end, intensity modulation causes phase modulation due to the carrier-induced change in the refractive index. This change is inherently due to the laser linewidth. Such optical pulses with a time-dependent phase shift are called chirped pulses. The optical spectrum is broadened due to this chirp. Theoretically, the chirp-induced power penalty is difficult to calculate, but it can be approximated to a 0.5 dB margin in system design (Chirp is also defined in Chapter 2.)