# US 10,310,209 B2 · Tight-buffered optical fiber having improved fiber access > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,209 B2 - Document ID: US10310209B2 - Status: Granted - Kind: B2 - Application number: 15/086,137 - Filed: 2016-03-31 - Published: 2017-10-05 - Granted: 2019-06-04 - Earliest claimed: 2016-03-31 - Assignees: OFS Fitel, LLC - Applicants: OFS Fitel, LLC - Inventors: Heng Ly; Peter A Weimann - Web page: https://patentgrep.com/patent/US10310209B2 ## CPC - G02B 6/4431: {with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping (break-out terminations G02B6/4471)} - G02B 6/02395: {Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104)} - G02B 6/443: {Protective covering} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A tight-buffered optical fiber cable includes an improved method of accessing the coated optical fiber. The cable can include an optical fiber having a glass core and a cladding layer. One or more coating layers can be applied about the cladding layer. A buffer jacket material can be applied onto an outer surface of the outer coating layer as a buffer jacket outer layer. The buffer jacket outer layer can have distinctive features including a low tear strength, low elastic modulus, high elongation percentage, and low peeling force. This can allow a user of the optical fiber cable to separate at least a portion of the coated optical fiber from the buffer jacket outer layer by grasping a free end of the coated optical fiber and pulling it through the outer wall of the buffer jacket outer layer, thereby tearing through the outer wall of the buffer jacket outer layer. ## Claims ### Claim 1 A buffered optical fiber comprising: an optical fiber comprising: a glass core; a cladding layer surrounding the glass core; at least one coating layer surrounding the cladding layer, wherein the glass core, the cladding layer, and the at least one coating layer collectively comprise a coated optical fiber; and a buffer jacket outer layer disposed directly against and surrounding an outer surface of the coated optical fiber to comprise a tight-buffered optical fiber, wherein the buffer jacket outer layer comprises a smooth outer surface, an elastic modulus in the range of 20 MPa to 90 MPa, an elongation percentage in the range of substantially 20 percent to substantially 80 percent, and tensile strength in the range of substantially 1 MPa to substantially 15 MPa; wherein the buffer jacket outer layer comprises an outer wall of the buffered optical fiber and wherein the coated optical fiber is configured to be torn through the outer wall of the buffer jacket outer layer. ### Claim 2 (depends on 1) The buffered optical fiber of claim 1, wherein the buffer jacket outer layer is constructed of a buffer jacket material comprising polyurethane acrylate. ### Claim 3 (depends on 1) The buffered optical fiber of claim 1, wherein the coated optical fiber is configured to be torn through the outer wall of the buffer jacket outer layer with a peeling force in the range of substantially 5 grams to substantially 50 grams. ### Claim 4 (depends on 1) The buffered optical fiber of claim 1, wherein the buffer jacket outer layer comprises an elongation percentage in a range of substantially 40 percent to substantially 60 percent and an elastic modulus in a range of substantially 50 MPa to substantially 70 MPa. ### Claim 5 (depends on 1) The buffered optical fiber of claim 1, wherein the buffer jacket outer layer comprises an elongation percentage in a range of substantially 45 percent to substantially 55 percent. ### Claim 6 A buffered optical fiber comprising: an optical fiber comprising: a glass core; a cladding layer surrounding the glass core; and at least one coating layer surrounding the cladding layer, wherein the glass core, the cladding layer, and the at least one coating layer collectively comprise a coated optical fiber; and a buffer jacket outer layer disposed directly against and surrounding an outer surface of the coated optical fiber to comprise a tight-buffered optical fiber, wherein the buffer jacket outer layer comprises a smooth outer surface, a tensile strength in the range of substantially 1 MPa to substantially 15 MPa, an elongation percentage in the range of substantially 20 percent to substantially 80 percent, and an elastic modulus in the range of substantially 30 MPa to substantially 80 MPa; wherein the buffer jacket outer layer comprises an outer wall of the buffered optical fiber and wherein the coated optical fiber is configured to be torn through the outer wall of the buffer jacket outer layer. ### Claim 7 (depends on 6) The buffered optical fiber of claim 6, wherein the tensile strength for the buffer jacket outer layer is substantially 6 MPA. ### Claim 8 (depends on 6) The buffered optical fiber of claim 6, wherein the coated optical fiber is configured to be torn through the buffer jacket outer layer with a peeling force in the range of substantially 5 grams to substantially 50 grams.