Optical unit for synchronizing clock signals

Details Optical unit for synchronizing clock signals Optical unit for synchronizing clock signals

1996-12-16

1999-08-17

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1000

Patent

active

059401982

ABSTRACT:
The invention relates to an optical unit (17) for synchronizing clock signals. The unit (17) comprises at least two ring lasers (1', 1"), each ring laser (1', 1") generating a repetitive optical pattern at a different repetition frequency f.sub.i. The repetition frequency of at least one of the ring lasers (1', 1") is variable. The unit (17) comprises detection means (19) adapted to simultaneously receive the optical patterns from two ring lasers (1', 1") to be synchronized with each other and to compare these patterns. The ring laser, whose repetition frequency is variable, is controllable on the basis of a signal from the detection means, by which the optical path length of this laser is changed. The invention also relates to a high-frequency carrier transmission system comprising an optical unit as described hereinbefore.

REFERENCES:
patent: 5652669 (1997-07-01), Liedenbaum et al.
"Compact InP-Based Ring Lasers Employing Multimode Interference Couplers and Combiners", R. van Roijen et al, Appl. Phys. Lett 64, (14), Apr. 4, 1994, pp. 1753-1755.
"Ultra-High-SpeechPLL-Type Clock Recovery Circuit Based on All-Optical Gain Modulation in Traveling-Wave Laser Diode Amplifier", by S. Kawanishi et al, Journal of Lightwave Technology, vol. 11, No. 12, Dec. 1993, pp. 2123-2129.
"Frequency Multiplication in Activity Mode-Locked Semiconductor Lasers", by N. Onodera et al., Applied Physics Letter vol. 62, No. 12, Mar. 1993.

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