Patent ID: 6347170
Filing Date: 2002-02-12
Classification: G02B

Abstract:
An optical device includes a plurality of optical parts for processing an optical signal transmission therein, comprising:a plurality of gaps each having an adjusted distance between said plurality of optical parts; two holding tubes holding two of said plurality of optical parts and said holding tubes are in contact with each other in at least one of said gaps; at least one of said holding tubes is arranged to dispose at a slightly different vertical position than other holding tubes for aligning with an outgoing orientation of said optical signal transmission; an epoxy applied over a contact area between two of said holding tubes over one of said gaps for securely bonding said holding tubes and said plurality of optical parts; a WDM coupler wherein said WDM coupler further comprising: a first GRIN lens attached to a WDM filter via a first epoxy; a first holding tube holding and securely bonding to said first GRIN lens with a second epoxy; a dual optical fiber pigtail disposed at a first optimal gap from said first GRIN lens to achieve a lowest transmission loss; a second holding tube holding and securely bonding to said dual optical fiber pigtail with a third epoxy and said first and second holding tubes being further securely bonding to each other with a fourth epoxy for maintaining said optimal gap between said first GRIN lens and said dual fiber pigtail; a third holding tube holding and bonding to a second GRIN lens with a fifth epoxy; a fourth holding tube holding a single fiber pigtail disposed at a second optimal distance from said second GRIN lens said fourth tube securely boding to said single fiber pigtail and to said third holding tube with a sixth epoxy for maintaining said second optimal distance; and said first holding tube holding said first GRIN length in physical contact and securely boding to said third holding tube holding said second GRIN lens with a seventh epoxy wherein said WDM filter is aligned with said second GRIN lens and said single and dual fiber pigtails having aligned outgoing orientation.