Browse Prior Art Database

OPTICAL ARCHITECTURE FOR TAPPED NETWORKS USING BIDIRECTIONAL OPTICS

IP.com Disclosure Number: IPCOM000235602D
Publication Date: 2014-Mar-11
Document File: 5 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Related People

Alessandro Cavaciuti: AUTHOR [+2]

Abstract

An architecture is provided to monitor two fibers of bidirectional links using an X-shaped optical coupler (2x2). An X-shaped optical coupler (2x2) allows monitoring of optical signals coming from both directions with a single device and without any additional insertion loss compared to use of two cascaded Y-shaped couplers.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 01 of 5

OPTICAL ARCHITECTURE FOR TAPPED NETWORKS USING BIDIRECTIONAL OPTICS

AUTHORS:

Alessandro Cavaciuti

Carlo Mariotti

CISCO SYSTEMS, INC.

ABSTRACT

    An architecture is provided to monitor two fibers of bidirectional links using an X-shaped optical coupler (2x2). An X-shaped optical coupler (2x2) allows monitoring of optical signals coming from both directions with a single device and without any additional insertion loss compared to use of two cascaded Y-shaped couplers.

DETAILED DESCRIPTION

    Optical taps are becoming widely used in optical networks, allowing an inexpensive and non-intrusive way to perform Deep Packet Inspection (DPI) at full line rate. Typical architectures currently use a passive Y-shaped optical splitter after the transmitter of the link that needs to be monitored.

    Optical links using bidirectional architectures are now available and a boost of their use is foreseen especially in 40G links. Tapping a bidirectional link with the architectures currently used for unidirectional links is not practical due to the presence of signal travelling in both directions. Furthermore, use of extra couplers in series would increase the extra-insertion loss beyond tolerable levels.

    A unique architecture is provided to implement tapped networks for Deep Packet Inspection (DPI) on bi-directional links using two fibers each carrying simultaneously two wavelengths in opposite directions. The architecture leverages X-shaped passive optical couplers (2x2) to tap light from both directions on each fiber and re-direct light toward the appropriate monitoring device, allowing monitoring of the whole data stream. X-shaped optical couplers can be manufactured with the same characteristics of Y-shaped (1x2) couplers, yet allow monitoring of light coming from both directions.

Copyright 2014 Cisco Systems, Inc.

1


Page 02 of 5

    FIG. 1 below is a diagram showing the use of an X-shaped optical coupler to tap light from both directions in each fiber of a bidirectional link.

FIG. 1

    FIG....