In some embodiments, an apparatus includes a coherent optical receiver that can receive during a first time period a set of in-phase signals and a set of quadrature signals having a skew from the set of in-phase signals. Another end of the supporting arm is pin connected to a suspension arm, and another end of the suspension arm is pin connected to a fixing mount that enables fixing to a bottom portion of the upper cover. The control device includes a cylinder in which a spool is mounted.