| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical frequency comb signal generator which can be made compact and can provide a large modulation depth without using an impedance matching circuit such as a stub. <P>SOLUTION: An optical frequency comb signal generator includes a Mach-Zehnder optical waveguide 2 formed on a ferroelectric substrate 1 and a modulation electrode 31, 32, for modulating light wave propagating through the branch waveguides, provided for each branch waveguide such that the Mach-Zehnder optical waveguide 2 outputs a light wave which simultaneously generates a plurality of optical frequency components having a predetermined frequency difference. Each modulation electrode includes a resonant electrode 31, 32 having different electrode length, and a feeder line 40 is split into two to feed a same modulation signal to each modulation electrode and laid out such that the distance from a branching point 41 to a contact point 44, 45 with each resonant electrode is the same. At the contact points, the standing wave W1, W2 formed on each resonant electrode is in phase with each other, and each feeder line is impedance-matched with corresponding resonant electrode at the contact point 44, 45. <P>COPYRIGHT: (C)2013,JPO&INPIT |
