Optical unit for multiplying the frequency of a clock signal

U.S. Patent Number: 5867520

Abstract: An optical unit for multiplying the frequency of a clock signal includes at least two series-arranged ring lasers. Each ring laser has a different resonance frequency f.sub.i. The unit has an input for receiving a signal, for example, a low-frequency electric signal for modulating one of the ring lasers. The repetition frequency of at least one of the ring lasers is variable by adapting the optical path length of the resonator.

Inventors: Liedenbaum; Coen T. H. F. (Eindhoven, NL), Pennings; Engelbertus C. M. (Eindhoven, NL), Van Roijen; Raymond (Yorktown Heights, NL), Reid; John J. E. (Eindhoven, NL), Tiemeijer; Lukas F. (Eindhoven, NL), Verbeek; Bastiaan H. (Eindhoven, NL)

Assignee: U.S. Philips Corporation (New York, NY)

Application Number: 08/813,414

Issued: 1999-02-02

Expired: 2007-02-02

Classes: 372/94 ; 327/119; 372/97

Field of search: 372/92-94,97,6 356/349,350 327/113,116,119,123

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