Polarization-independent waveguide-type optical interference circuit
US8346030B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2007 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Jul 10, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12038
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Mach-Zehnder interferometer circuit (700) is provided with two couplers (722, 724) and two arm waveguides (706, 708) connecting the couplers with each other, each fabricated on a substrate, in which a polarization rotation device (732) is disposed in a groove dividing each of the two arm waveguides into two, the polarization rotation device (732) for converting vertically polarized light into horizontally polarized light, and birefringence is adjusted by performing laser irradiation or the like partially into at least one of the two arm waveguides such that a difference between birefringence values divided by an optical wavelength to be used is within a range of 2 m-0.2 to 2 m+0.2 (m is an integer including zero), the birefringence values being those integrated linearly along the respective two arm waveguides in an optical signal travelling direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.