Optical reception apparatus compatible with DQPSK polarization multiplexing format
US7689074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2008 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Oct 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/21
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In the optical reception apparatus, a DQPSK polarization multiplexed signal light (S) input thereto is split into horizontally/vertically polarized signal lights (SH, SV) by a polarization beam splitter (3), and the signal lights (SH, SV) each is branched into two by each of optical couplers (4H, 4V). Then, one branched lights (SH1, SV1) by each of the optical couplers (4H, 4V) are supplied to a delay interferometer (5I) on the I branch via optical circulators (10I1, 10I2) to be propagated in bidirectional, and the other branched lights (SHQ, SVQ) by each of the optical couplers (4H, 4V) are supplied to a delay interferometer (5Q) on the Q branch side via optical circulators (10Q1, 10Q2) to be propagated in bidirectional, so that a set of delay interferometers (5I, 5Q) is commonly used for horizontally polarized waves and vertically polarized waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.