Method and apparatus for adding wavelength components to and dropping wavelength components from a dense wavelength division multiplexed optical signal
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United States of America Patent
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Issued Date -
Nov 7, 2002
app pub date -
May 2, 2002
filing date -
May 4, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An add/drop apparatus uses a series of switches and at least one Bragg grating. Each switch operates in a first state and a second state. A signal traveling in a first direction passes through each switch from a respective first port to a respective second port without reflection, whether the switch is in the first or in the second state. After passing through the series of switches, the signal interacts with a Bragg grating. The Bragg grating reflects a component of the signal at at least one specific wavelength back in a second direction opposite the first direction. The component of the signal traveling in the second direction propagates from the respective second port to the respective first port, without reflection, in each switch operating in the first state. The component of the signal traveling in the second direction is reflected from the second port to a third port by a switch operating in the second state. By selecting which switch is operating in the second state, the signal can be routed to a selected location coupled to the third port of the switch operating in the second state.
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