A circuit and method for starting up a band-gap reference circuit. Such updates may be provided by obtaining an update image corresponding to the update of the programmable memory and obtaining a certificate associated with the update image, the certificate having update application rules in at least one extension of the certificate. The case has a hole; the chassis, lying under the case, includes a latch and a set of slots. A portion of the light traveling along the core is removed from the core along the secondary waveguide path such that the device can be utilized as an attenuator, an optical tap, or a polarimeter.