One or more launch fixture (650)s for optical shape sensing (OSS), the one launch fixture (650) or each launch fixture (650) being configured to receive and secure an optical fiber within a flexible OSS enabled instrument. A docking device (670) is provided for securing the launch fixture (650)(s) onto a launch fixture base (660). The docking device (670) may include one or more launch fixture (650) slots on one side of the docking device (670), or one or more launch fixture (650) slots on each of two opposing sides of the docking device (670).