Chirp parameter plays an important role in the optical communication system. In this paper, we use a simple method to extact the chirp parameter, where the electroabsorption modulators (EAM) and broad-band Cr:YAG crystal-fiber are two main devices to be measured. A high-speed vector network analyzer (VNA) and a 50km non-zero-dispersion single-mode fiber (SMF) are used in this method. Modulating and detecting the optical power by the VNA signal, the chirp-parameters can be obtained by launching the chirped-optical signal into the SMF. It shows that this method is a reliable tool for analysis of chirp on fiber-based devices.
Generally, EAMs have high-speed performance, however the chirp behavior still is a dominated factor on long optical fiber transmission. When changing the wavelength of input optical power and DC-bias applying on EAMs, the chirp parameters will be varied. Our measured results showed that the chirp parameters of the EAMs are in a low range of from ¡V1 to 1. These low values give an indication that it is quite useful for long-distance optical fiber transmission.
We also measured the chirp parameter of Cr4+: YAG crystal fiber. Its ASE spectrum covers the whole communication wavelength (1300nm to 1600nm) and the absorption wavelength is in near-infrareds ranges (980nm to 1100nm). Therefore, this kind of materials can be potentially used for most of the telecommunication fields used today, like fiber-based optical amplifier, ASE, laser ¡K and so on. In order to further investigate the performance of Cr4+: YAG crystal fiber, the ASE, optical gain and the chirp behaviors are also measured in this paper.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0707104-171306 |
| Date | 07 July 2004 |
| Creators | Huang, Jin-Lin |
| Contributors | Sheng-Lung Huang, Keh-Y i Lee, Tsong-Sheg Lay, San-Liang Le, Yi-Jen Chiu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707104-171306 |
| Rights | not_available, Copyright information available at source archive |
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