Abstract

A 90° optical hybrid is a four-port optical device with two inputs and two outputs. The two output signals are proportional to E1 + E2 and E1 + E2 exp (j90°), where E1 and E2 are the complex amplitudes of the two input signals. The 90° hybrids are needed in many applications, including homodyne optical receivers in both phase-locked1 and phase-diversity2 configurations. Optical hybrids were previously implemented with discrete optical components.3 An optical hybrid implemented entirely in the single-mode fiber domain may be more attractive for single-mode fiber communication systems, since it is fully compatible with other components, and the high insertion loss and alignment problems associated with conventional bulk-optic components can be avoided. The principle ot operation of an all-fiber 90° hybrid is described, and an experimental unit using connectorlzed in-line single-mode fiber components is reported.

© 1987 Optical Society of America

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription