Ciena Corporation

David Berton

Naim Ben-Hamida

Jerry Yee-Tung Lam

Jacob Pike

Euhan Chong

Aspects of the subject disclosure may include, for example, an inner clock generation circuit, including: a selectable frequency divider having: a ring of tri-state inverters; a reset gate on an output of each tri-state inverter in the ring; and a reset circuit comprising one or more selectable flip-flops; and a duty-cycle limiter that generates clock signals having a 25% duty cycle from three out of four quadrature clock signals. Other embodiments are disclosed.

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Ottawa, Canada

David Berton