A unitary high pressure seal provides a fluid seal against multiple surfaces, at least one of which is static and one of which is dynamically loaded. A method of tuning an optical resonator includes applying a voltage or current to a charge-based memory cell to generate a non-volatile charge within the memory cell, the nonvolatile charge changing a resonant frequency of the optical resonator. In at least one embodiment, the method periodically issues bundle version identifying signals to different nodes of the network. Meta descriptors are self adaptive in a manner that reflects real use scenarios. The driving circuit 33 includes a self-oscillating circuit 34, 38 that oscillates at a series resonance frequency of the piezoelectric element 32 and a non-linear circuit 36, 40, 42, 44, 46 for adding distortion to the drive voltage that is applied to the piezoelectric element 32. When the fallen pulse signal is detected, the sampling unit directs the signal state discriminating unit to obtain the state of the pulse signal at a time point, which is output as the pulse duration of the pulse signal.