Optical fiber modulator having an optical fiber having a poled portion serving as an electrooptic element and method for making same
US6008927A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1998 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Mar 27, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/21
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fiber modulator comprises an optical fiber, a substrate having a groove pattern in which the optical fiber is fixed, and a modulation unit including a polarizer, an electrooptic element, and an analyzer aligned in a light path of the optical fiber in this order, wherein the electrooptic element is made of a poled portion of the optical fiber, and when the electrooptic element is in an electric field-free condition, an absolute value, .delta., of a phase difference of a beam passed through the electrooptic element is within the following range EQU (m/2-1/6).pi..ltoreq..delta..ltoreq.(m/2+1/6).pi. wherein m is an odd number. When the portion of the optical fiber is poled from two different directions, the modulation unit should further include a wave plate, and an absolute value, .delta.1, of a phase difference of a beam passed through the wave plate and the electrooptic element is within the following range of (n/2-1/6).pi..ltoreq..delta..ltoreq.(n/2+1/6).pi. wherein n is an odd number. Methods for making the modulators are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.