Ni:LiNbO3 Mach–Zehnder modulators with a combinational-type waveguide structure

✍ Scribed by Wen-Ching Chang; Chao-Yung Sue; Chih-Hui Ko; Ming-Yung Hsun; Li-Ying Chang; Hwei-Yuan Liu

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 171 KB
• Volume: 20
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19990320)20:6<364::aid-mop4>3.0.co;2-j

✦ Synopsis

TABLE 1 Dynamic Range Ratio, Adjacent Excitation Ratio, and Efficiency of the Patterns of Figure 1 < < < < I rI IrI ma x max min n n" 1 Villeneuve pattern 1.75 1.13 0.966 Final pattern 1.55 1.09 0.967 Ž SLL specification outer sidelobes are, in fact, lower than in . the Villeneuve pattern , and the excitation distribution shows no edge brightening. The excitation distribution also has a < < smaller dynamic range ratio and smaller I rI than max n n" 1

the Villeneuve distribution, and is even marginally more Ž . efficient Table 1 .

4. Conclusions

The method described in this letter allows edge brightening to be eliminated from Villeneuve excitation distributions with no increase in SLL or loss of efficiency while minimizing the < < dynamic range ratio and I rI

. It can also be applied max n n" 1 with advantage to the synthesis difference patterns, shaped beams, and sum patterns with inner sidelobes that are depressed relative to outer sidelobes.