On the TWT based on a helix slow-wave structure sustained by rectangular dielectric rods

✍ Scribed by Stefano D'Agostino; Francesco Emma; Claudio Paoloni

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 117 KB
• Volume: 20
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19990205)20:3<177::aid-mop8>3.0.co;2-e

✦ Synopsis

Figure 7 Pulse response of the 1 km fiber link, using a DFB laser diode transmitter and a semiconductor optical amplifier SOA . Ž .

Ž . The SOA is placed at the transmitter top and at the receiver bottom . Full time scale range: 6 ns levels of optical power. This is due to the stronger optical saturation of the SOA, which enhances the nonlinear dynamic effects related to electron᎐photon interactions in the amplifier.

CONCLUSION

Fiber optic delay lines are built, tested, and compared to commercially available optical links. An excellent SFDR is obtained in the built links, which give better performance at a lower cost, than similar commercially available fiber optic links. The less expensive F᎐P laser is shown to have only a small degradation of SFDR compared to the DFB laser. Therefore, it can be used in less demanding, low-cost applications. Due to optical nonlinearities, an SOA cannot be used to compensate for the loss in fiber for long delay lines. In order to improve performance by optical amplification in extremely long links, these links should incorporate erbiumdoped fiber amplifiers with much lower nonlinearities, and consequently, lasers operating at a 1.55 m wavelength.