Multiwavelength optical switch with its multiplicity reduced

Details Multiwavelength optical switch with its multiplicity reduced Multiwavelength optical switch with its multiplicity reduced

1998-10-05

1999-10-26

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, H04J 1402

Patent

active

059738090

ABSTRACT:
A multiwavelength optical switch capable of reducing an amount of internal circuit components to be connected to a plurality of multiwavelength circuit, and thus saving the occupied area of the switch. A wavelength router (11) receives, at M (M=3) input ports (a3, a6 and a9), multiwavelength optical signals (f#0-f#8) with the number of multiplexed wavelengths being nine (N=9) through incoming paths (13), reduces the number of multiplexed wavelengths to three (=N/M), and outputs the resultant optical signals from output ports (b1-b8). The same optical signals with the number of multiplexed wavelengths being three are connected to input ports of three switches (41, 42 and 43) through links (111-113), each consisting of M (=3) lines. The output ports of the switches are connected to input ports (b1-b9) of a wavelength router (12) through outgoing links (121-123). The three switches (41, 42 and 43) receive the multiwavelength optical signals (.lambda.2, .lambda.5, .lambda.8), (.lambda.0, .lambda.3, .lambda.6) and (.lambda.1, .lambda.4, .lambda.7) through the links (111-113), respectively, and connect them to the links (121-123) corresponding to the output ports. This makes it possible to output an optical signal of a desired wavelength on a desired input port to a desired output port. The total number of the links at the input and output stages is 2N, which makes it possible to reduce the number of links and circuit components of the input and output stages by a factor of M as compared with the total number of links of 2NM of a conventional highway switch without using the multiplexed links.

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Y.D. Jin et al, "Performance Degradation Due to Cross-talk in Multiwavelength Optical Networks Using Dynamic Wavelength Routing", IEEE Photonics Technology Letters, vol. 7, No. 10, Oct. 1995, pp. 1210-1212.

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