Process of assembling coherent optical receiver
AssigneeSumitomo Electric Device Innovations, Inc.
InventorsKen Ashizawa, Kakushi Nakagawa
Life of this patent
Estimating the term…
Abstract
Methods of assembling and testing an optical coherent receiver are disclosed. The method includes steps of, preparing a test beam by combining a first test beam and a second test beam each having respective polarizations orthogonal to each other, entering the test beam accompanied with a third test beam, and aligning a polarization beam splitter (PBS) that splits the test beam depending on the polarizations thereof and a beam splitter (BS) that split the third test beam. A feature of the methods are that the alignment of the PBS and the BS and the monitor of outputs therefrom are concurrently carrier out for two multi-mode interference (MMI) devices.
Claims13
A method of assembling an optical coherent receiver that receives a signal beam having two polarizations substantially orthogonal to each other and a local beam having a substantially linear polarization, the optical coherent receiver including a polarization beam splitter (PBS) that splits the signal beam into two portions depending on the polarizations thereof, a beam splitter (BS) that splits the local beam into two portions independent of the linear polarization of the local beam, and two multi-mode interference (MMI) devices, the method comprising steps of:
- preparing a test beam by combining a first test beam having a substantially linear polarization and a second test beam having a substantially linear polarization whose direction is orthogonal to the polarization of the first test beam, the test beam emulating the signal beam;
- preparing a third test beam having a substantially linear polarization, the third test beam emulating the local beam;
- entering the test beam and the third test beam into the coherent receiver from respective dummy ports;
- coupling the test beam and the third test beam concurrently with the two MMI devices.
A method of testing an optical coherent receiver capable of extracting data from a signal beam with a dual polarization, the method comprising steps of:
- generating a first test beam by a first optical source, a second test beam by a second optical source, and a third test beam by a third optical source,
- adjusting the first test beam and the second test beam such that polarizations thereof become orthogonal to each other;
- combining the first test beam with the second test beam to generate a combined test beam after adjusting the polarizations thereof;
- and
- entering the combined test beam into the optical coherent receiver from one port and the third test beam into the optical coherent receiver from another port.
Dependencies are inferred from the claim text.