Systems and methods are provided for designing integrated circuits using configurable delay cell circuits that serve to expedite timing closure for an integrated circuit design by eliminating the need to iteratively repeat various design steps such as placement, signal distribution network synthesis, and routing. Water passes through the filter at an upward angle. According to one embodiment, a noise threshold level is dynamically generated for detecting noises in incoming data stream from the existing phone line home network. A fluctuation is expanded in a phase direction through propagation in a second optical fiber. The light emitting part is provided on the first semiconductor layer.