Optical part module reduced in size and printed board package having such an optical part module
AssigneeFujitsu Limited
InventorShigeichi Izumi
Life of this patent
Estimating the term…
Abstract
An optical part module has an optical amplification fiber in a small space without damage or losing its optical characteristics. An optical amplification fiber connects optical parts in the case. The optical amplification fiber has a predetermined length which creates a large play in length. A part of the optical amplification fiber creating the play in length is wound on the bobbin. The winding operation is performed while turning the bobbin upside down for each single turn of the winding so that twist generated in the optical fiber due to winding is canceled.
Claims15
An optical part module comprising:
- a case;
- a plurality of optical parts provided in said case;
- an optical fiber connecting said optical parts, said optical fiber having a predetermined length which creates a large play in length;
- and
- a bobbin provided in said case, a part of said optical fiber creating said play in length being wound on said bobbin, said part of said optical fiber being wound while turning said bobbin upside down for each single turn of the winding so that twist generated in said optical fiber due to winding is canceled.
A printed board package comprising:
- a) an optical part module comprising:
- a case;
- a plurality of optical parts provided in said case;
- an optical fiber connecting said optical parts, said optical fiber having a predetermined length which creates a large play in length;
- and
- a bobbin provided in said case, a part of said optical fiber creating said play in length being wound on said bobbin, said part of said optical fiber being wound while turning said bobbin upside down for each single turn of the winding so that twist generated in said optical fiber due to winding is canceled;
- and
- b) a printed board for mounting electronic parts, said optical part module being mounted on said printed board.
A method for canceling twist generated in an optical fiber when said optical fiber is wound on a bobbin, said bobbin having a first surface perpendicular to a center axis of winding and a second surface opposite to said first surface, said method comprising the steps of:
- a) winding said optical fiber substantially a single turn on said bobbin while facing said first surface upwardly;
- b) turning said bobbin upside down in a first direction so that said second surface faces upwardly;
- c) winding a rest of said optical fiber substantially a single turn on said bobbin;
- d) turning said bobbin upside down in a second direction opposite to said first direction so that said first surface faces upwardly;
- and
- e) repeating the step a) to d) until a predetermined length of said optical fiber is wound on said bobbin.
Dependencies are inferred from the claim text.