Some phosphor powders can be difficult to form into ceramic compacts because they are difficult to sinter. In order to prevent lock-seam slip, a clinching roller device form interlocking spaced deformations on the lock-seam. 9 \u03bcm or less, while a roughness R1 of the first internal electrode is lower than a roughness R2 of the second internal electrode. The second device reads selected header information from the synchronization packet and re-uses this information for the header of the acknowledgment packet. The waveguide includes rib waveguides formed in the layer of silicon and at least one phase modulator for altering the phase of light traveling along one of the rib waveguides.