Multiwavelength peak power equalized lasers based on SOA using a sampled chirped fiber Bragg grating
✍ Scribed by G. Ning; P. Shum; S. Aditya; Y.D. Gong; L. Xia
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 464 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
relocated from 1.86 to 1.97 GHz whilst the upper zero varies from 2.24 to 2.04 GHz.
3. MEASURED RESULTS
To verify the proposed approach, a filter is designed at f 0 ϭ 2 GHz with 3.5% FBW and R ϭ 0.64 using the dimensions as reported in the last section. The substrate used is RO4003 with relative dielectric constant of 3.38 and substrate height 1.52 mm. Its measurements have been recorded in Figure 4 and a good agreement with the simulation is observed. Two transmission zeros are reported at 1.91 and 2.04 GHz, respectively. The measured 3 dB BW is around 85 MHz (4.3% FBW) and center frequency is located at 1.99 GHz. About 2 dB passband insertion loss as well as 17 dB matching are also measured at center frequency. The stopband performance of the proposed filter outweighs that of the conventional structure by more than 20 dB suppressions at 2.97 GHz, as shown in Figure 4. This yields spurious free stopband with around 20 dB rejection till 3.1 GHz. The fabricated transversal filter photo is also shown in Figure 5 with circuit size about 36 ϫ 36.3 mm 2 , which is similar to that of the conventional ones.
4. Conclusions
A novel microstrip transversal bandpass filter with spurious response suppression is proposed. An additional transmission zero is introduced to improve the filter selectivity without circuit size increase. Both the simulated and measured results validate the proposed filter performance.