Arrangement and method relating to optical transmission
First Claim
1. An arrangement for wavelength dependent routing of optical signals including a number of wavelengths, which arrangement comprises an optical Add-Drop multiplexing arrangement with input and output waveguides and comprising a routing device, including splitting means with a number of inputs and combining means with a number of outputs, one of said inputs and outputs respectively being used for a multi-wavelength input/output, another input and output respectively being used for an add/drop wavelength respectively, the other inputs, and outputs being used for looping back of the remaining wavelengths, between which splitting and combining means a number of branch waveguides are arranged, both wavelength demultiplexing/multiplexing and switching being provided for by said routing device, the arrangement further being wavelength tunable, the wavelength(s) to be added and/or dropped being selectable.
1 Assignment
0 Petitions
Accused Products
Abstract
An arrangement and a method route wavelength dependent optical signals including a number of wavelengths. The arrangement includes an optical Add-Drop multiplexing arrangement with input and output waveguides and a routing device with inputs and outputs. The routing device includes a splitting device with a number of inputs and a combining device with a number of outputs. One of the inputs and outputs, respectively, are used for a multi-wavelength input, whereas another input and another output, respectively, are used for an add/drop wavelength. The other inputs and outputs are used for looping back of the remaining wavelengths. Between the splitting and combining devices a number of branch waveguides are arranged, and both wavelength demultiplexing/multiplexing and switching are provided for by the routing device.
55 Citations
29 Claims
- 1. An arrangement for wavelength dependent routing of optical signals including a number of wavelengths, which arrangement comprises an optical Add-Drop multiplexing arrangement with input and output waveguides and comprising a routing device, including splitting means with a number of inputs and combining means with a number of outputs, one of said inputs and outputs respectively being used for a multi-wavelength input/output, another input and output respectively being used for an add/drop wavelength respectively, the other inputs, and outputs being used for looping back of the remaining wavelengths, between which splitting and combining means a number of branch waveguides are arranged, both wavelength demultiplexing/multiplexing and switching being provided for by said routing device, the arrangement further being wavelength tunable, the wavelength(s) to be added and/or dropped being selectable.
- 24. An optical Add-Drop Multiplexing arrangement with a number of input waveguides including a multiple wavelength input port and a number of output waveguides including a multiple wavelength output port and comprising a routing device, which routing device is a combined demultiplexing/routing device providing demultiplexing as well as switching functionality, the wavelength(s) to be added and/or dropped being selectable, thus providing a wavelength tunable arrangement, said arrangement further being integrated on a single chip.
-
29. A method of performing wavelength depending routing in an optical communication system comprising a number of Optical Add-Drop multiplexers, said method comprising the steps of:
-
receiving N substantially equally spaced wavelengths over a first waveguide in an Optical Add-Drop Multiplexer (OADM), receiving a wavelength to be added over a separate waveguide in the OADM, inputting the N wavelengths via a first input to a Multi-mode Interference-Multi-mode-Interference Mach-Zehnder routing device, inputting the add wavelength via a second input to the MMI-MZI routing device, separating the N substantially equally spaced wavelengths selecting through adjustment of phase control means a wavelength to be dropped, routing the wavelength to be dropped to a separate output waveguide via a separate output of the routing device, switching one wavelength directly through the routing device, to a common output for N wavelengths, looping back the remaining N-2 wavelengths to inputs of the routing device, outputting the N-2 looped-back wavelengths and the wavelength switched directly through the routing device as well as the added wavelength from the add port over a common output waveguide different from the separate waveguide for the dropped wavelength.
-
Specification