A multi-fiber ribbon-coupled multi-channel, optical amplifier architecture has a very compact form factor that facilitates one-for-one alignment with and coupling to each optical fiber of a multi-fiber ribbon. Such fuel cells may not use platinum in the electrode or catalyst, or may use platinum in small amounts. The absorbent body has a length of 140-260 mm and tapers rearwardly from a section of greatest width situated in the front part of the article to the end of the rear part of the article. The delayed second serial differential output data signals are delayed relative to the first serial differential output data signals. The acquisition unit acquires a thickness of a preceding postal matter. The pump delivers hydraulic fluid to the engage chamber to pressurize and inject resin into a mold cavity through the piston.