Tunable add drop optical filtering method and apparatus

Details Tunable add drop optical filtering method and apparatus Tunable add drop optical filtering method and apparatus

1994-08-31

1996-01-30

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359128, 359130, 385 24, H04J 1402

Patent

active

054885000

ABSTRACT:
The present invention includes a tunable add/drop filter that utilizes the unique operational characteristics of a wavelength grating router. The filter comprises a 1.times.N switch, a wavelength grating router (WGR) having a plurality of inputs and outputs, and a multiplexer. The WGR demultiplexes an incoming wavelength division multiplexed (WDM) signal, providing the frequency components of the WDM signal at different outputs. The WGR outputs include a set of retain outputs that are coupled directly to the multiplexer and a drop output that is connected to a drop line. The particular WDM signal frequency component that is provided to the drop output depends directly on the WGR input at which the WDM signal is received. The 1.times.N switch controllably provides the WDM signal to the proper WGR input so that a select frequency is provided at the drop output, which in turn drops the select frequency from the WDM signal. The undropped signals, as well as any added signals are multiplexed into a new WDM signal by the multiplexer.

REFERENCES:
patent: 5136671 (1992-08-01), Dragone
patent: 5367586 (1994-11-01), Glance
Dragone, C., "An N.times.N Optical Multiplexer Using a Planar Arrangement of Two Star Couplers," IEEE Photonics Technology Letters, vol. 3, No. 9, Sep. 1991, pp. 812-815.
Dragone, C., et al., "Integrated Optics N.times.N Multiplexer on Silicon," IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991, pp. 896-899.
Cheung, K. -W., "Acoustooptic Tunable Filters in Narrowband WDM Networks: System Issues and Network Applications," Journal on Selected Areas in Communications, vol. 8, No. 6, Aug. 1990, pp. 1015-1025.
Elrefaie, A. F., "Multiwavelength Survivable Ring Network Architectures," GLOBECOM '89 Proc., Dallas, Tex., Nov. 1989.

Affiliated with

Also associated with

Rating

Tunable add drop optical filtering method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tunable add drop optical filtering method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable add drop optical filtering method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-160059