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What is AWG in optical fiber?

What is AWG in optical fiber?

An arrayed waveguide grating (AWG) is a generalization of the Mach-Zehnder interferometer. When light enters the input cavity, it is diffracted and enters the waveguide array. There the optical path difference of each waveguide creates phase delays in the output cavity, where an array of fibers is coupled.

What is AWG dwdm?

DWDM Mux/Dmux Arrayed Waveguide Grating AWG Athermal NeoPhotonics Athermal AWG is an integrated PLC component that multiplexes or demultiplexes 8 to 96 channels onto a single fiber, and follows the mechanical requirements of the Multi Source Agreement for Athermally-Stabilized AWG Modules.

How does an arrayed waveguide grating work?

The grating consists of many waveguides with a constant length increment (ΔL). Light diffracting out of the input waveguide at the coupler/slab interface propagates through the free-space region (2) and illuminates the grating with a Gaussian distribution.

What is a grating coupler?

An example of guided-mode resonance is a grating coupler, which is a region on top of or below a waveguide where there is a grating. In such a case, light will be guided in the waveguide until it reaches the waveguide edge, or an additional coupling element, which will couple the light out.

What is OADM in DWDM?

An optical add-drop multiplexer (OADM) is a device used in wavelength-division multiplexing systems for multiplexing and routing different channels of light into or out of a single mode fiber (SMF). An OADM may be considered to be a specific type of optical cross-connect.

How does a grating coupler work?

For grating coupling, fiber is placed above diffractive grating structures on the top of chip. A vertical GC changes the off-plane wave-vector direction of light to the in-plane waveguide direction, and then couples the light into waveguide using a spot-size converter.

What is EDGE coupling?

Fiber-chip edge couplers are extensively used in integrated optics for coupling of light between planar waveguide circuits and optical fibers. The coupler allows direct coupling with conventional cleaved optical fibers with large mode size while circumventing the need for lensed fibers.

Which type of fiber has the highest modal dispersion?

The longer the path is, the higher the model dispersion will be. For example, the high-order modes (light entering at sharp angles) have more model dispersion than low-order modes (light entering at smaller angles). Multimode fiber can support up to 17 modes of light at a time, suffering much modal dispersion.

What is grating coupling?

What do you call an arrayed waveguide grating?

Arrayed-waveguide gratings (AWG) are based on the principles of diffractions. An AWG device is sometimes called an optical waveguide, a waveguide grating router, a phase array, or a phasar. An AWG device consists of an array of curved-channel waveguides with a fixed difference in the length of optical path between the adjacent channels.

How is coupling estimated in array waveguides?

Coupling is estimated by the waveguide width and the waveguide_acceptance_fraction. The light is propagated through the array waveguides using the values of neff and ng from step 1 and estimated loss.

How are AWGs used in an optical network?

The AWGs are used to multiplex channels of several wavelengths onto a single optical fiber at the transmission end and are also used as demultiplexers to retrieve individual channels of different wavelengths at the receiving end of an optical communication network.

How is light refocused in an array of waveguides?

Light diffracted from each waveguide of the grating interferes constructively and gets refocused at the output waveguides (5), with the spatial position, the output channels, being wavelength dependent on the array phase shift .