US4157253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing absorption losses in fused quartz and fused silica optical fibers
Assignee: RCA Corp
•
Filing: 1978-06-23
•
Granted: 1979-06-05
•
Expires: 1998-06-23
Abstract
Abstract A method of reducing the absorption losses in an optical fiber by irradiating the optical fiber with ultraviolet light at a reduced pressure and elevated temperature.
Inventors
- 👤 Karl G. Hernqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:29
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/62; C03C25/6206; C03C25/6226; C03B; C03B37/00; C03B37/10; C03B37/14; C03B37/15; Y; Y10; Y10S; Y10S65/00; Y10S65/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A method of reducing absorption losses in an optical fiber comprising: heating an optical fiber selected from the group consisting of fused quartz and fused silica, to from about 500° C. to about 1500° C. under a pressure of from about 1×10 -2 to about 1×10 -10 torr; and irradiating said optical fiber with ultraviolet radiation in the wavelength range of from about 3000 to about 4000 angstroms for a sufficient time to dissociate the hydroxyl radicals contained in the optical fiber.
Claim 2
Independent Claim
82 words
A method of reducing absorption losses in an optical fiber comprising: heating an optical fiber selected from the group consisting of fused quartz and fused silica, to from about 500° C. to about 1500° C. under a pressure of from about 1×10 -2 to about 1×10 -10 torr; and irradiating said optical fiber with ultraviolet radiation in the wavelength range of from about 3000 to about 4000 angstroms for a sufficient time to dissociate the hydroxyl radicals contained in the optical fiber.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein the temperature is from about 900° C. to about 1200° C.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein the temperature is about 1000° C.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the vacuum is about 1×10 -5 torr to about 1×10 -8 torr.
Claim 6
Dependent Claim
24 words
A method according to claim 1 wherein the optical fiber is irradiated with ultraviolet radiation for from about 150 seconds to about 1 hour.
References Cited (Backward Citations)
GB1003974A
Cited
US3836347A
Cited
US3788827A
Cited
US3865564A
Cited
US4028135A
Cited
US4028080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |