A cost effective ceramic package for LD/PD module in subscriber system

Proposes a new concept ceramic package for LD/PD module in subscriber system to meet the demand of significant package cost reduction. Subscriber system requires not only cost reduction but also high reliability in a harsh environment. Ceramic packages utilized in trunk lines show good reliability. We propose a new ceramic package which is cost effective. The new ceramic package is a DIP type package which has good operation of assembly on circuit board and good capability for mass production of assembly on circuit board and for mass production of the package. An outer pin pitch of the package has same pitch as 14 pin type or Minidil type structure for ease of circuit board mounting and utilization of industrial standard pin pitch saves the cost of circuit board modification. The new ceramic package has two stage grooves. The first groove holds optical fiber feed with organic adhesive and the fiber core is mounted on the second groove. This two-stage groove structure allows strong fiber attachment to the package. We evaluate reliability by observing change in light power of LD module after assembly of the LD module utilizing silicon V-groove platform and encapsulation by ceramic lid with epoxy sealant which has low Young´s modulus. The change in light power from LD module after high temperature and high humidity test of 85C/85%, 2000 hour was less than +/-1 dB. This result indicates that the new ceramic package has capability for use reliability and cost effective