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The present invention relates to a method for manufacturing a preform for optical fibers, wherein deposition of glass-forming compounds on the substrate takes place. The present invention furthermore relates to a method for manufacturing optical fibers, wherein one end of a solid preform is heated,

The present invention relates to a method for manufacturing a preform for optical fibers, wherein deposition of glass-forming compounds on the substrate takes place. The present invention furthermore relates to a method for manufacturing optical fibers, wherein one end of a solid preform is heated, after which an optical fiber is drawn from said heated end.

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1. A method for manufacturing a preform for optical fibres, comprising: depositing glass layers onto the interior surface of a glass substrate tube via PCVD deposition or MCVD deposition; andthereafter, contracting the glass substrate tube into a preform;wherein the deposition step is carried out in

1. A method for manufacturing a preform for optical fibres, comprising: depositing glass layers onto the interior surface of a glass substrate tube via PCVD deposition or MCVD deposition; andthereafter, contracting the glass substrate tube into a preform;wherein the deposition step is carried out in an environment in which the glass substrate tube is present in a conditioned atmosphere having a moisture content of less than 5 g/kg. 2. The method according to claim 1, wherein the deposition step is a PCVD deposition step. 3. The method according to claim 1, wherein the deposition step is an MCVD deposition step. 4. The method according to claim 1, wherein the deposition step is carried out in a conditioned atmosphere having a moisture content of less than 2 g/kg. 5. The method according to claim 1, wherein the contraction step is carried out in a conditioned atmosphere having a moisture content of less than 5 g/kg. 6. The method according to claim 1, wherein the contraction step is carried out in a conditioned atmosphere having a moisture content of less than 2 g/kg. 7. The method according to claim 1, comprising drawing an optical fiber from the preform. 8. The method according to claim 1, comprising maintaining a conditioned atmosphere having a moisture content of less than 5 g/kg around a deposition machine for a period of at least seven days; wherein the deposition step is carried out in the deposition machine after the period of at least seven days in the conditioned atmosphere. 9. The method according to claim 1, comprising maintaining a conditioned atmosphere having a moisture content of less than 2 g/kg around a deposition machine for a period of at least seven days; wherein the deposition step is carried out in the deposition machine after the period of at least seven days in the conditioned atmosphere. 10. The method according to claim 1, comprising maintaining a conditioned atmosphere having a moisture content of less than 5 g/kg around a deposition machine for a period of at least ten days; wherein the deposition step is carried out in the deposition machine after the period of at least ten days in the conditioned atmosphere. 11. The method according to claim 1, comprising maintaining a conditioned atmosphere having a moisture content of less than 2 g/kg around a deposition machine for a period of at least ten days; wherein the deposition step is carried out in the deposition machine after the period of at least ten days in the conditioned atmosphere. 12. A method for making an optical preform, comprising: providing a reduced-moisture environment having a moisture content of less than 5 g/kg to promote attenuation-reducing deposition of glass layers on a glass substrate tube;placing the glass substrate tube within the reduced-moisture environment;depositing glass layers onto the interior surface of the glass substrate tube via PCVD deposition or MCVD deposition, wherein the glass deposition proceeds while the glass substrate tube remains in the reduced-moisture environment, which is maintained at a moisture content of less than 5 g/kg; andthereafter, contracting the glass substrate tube into an optical preform. 13. The method according to claim 12, wherein the deposition step proceeds in a reduced-moisture environment that is maintained at a moisture content of less than 2 g/kg. 14. The method according to claim 12, wherein the contraction step is performed in a reduced-moisture environment having a moisture content of less than 5 g/kg. 15. The method according to claim 14, wherein the contraction step is performed in a reduced-moisture environment having a moisture content of less than 2 g/kg. 16. The method according to claim 12, wherein the deposition step comprises a PCVD deposition step. 17. The method according to claim 12, comprising maintaining a reduced-moisture environment having a moisture content of less than 5 g/kg around a deposition machine for a period of at least seven days; wherein the deposition step is carried out in the deposition machine after the period of at least seven days in the reduced-moisture environment. 18. The method according to claim 12, comprising maintaining a reduced-moisture environment having a moisture content of less than 2 g/kg around a deposition machine for a period of at least seven days; wherein the deposition step is carried out in the deposition machine after the period of at least seven days in the reduced-moisture environment. 19. The method according to claim 12, comprising maintaining a reduced-moisture environment having a moisture content of less than 5 g/kg around a deposition machine for a period of at least ten days; wherein the deposition step is carried out in the deposition machine after the period of at least ten days in the reduced-moisture environment. 20. The method according to claim 12, comprising maintaining a reduced-moisture environment having a moisture content of less than 2 g/kg around a deposition machine for a period of at least ten days; wherein the deposition step is carried out in the deposition machine after the period of at least ten days in the reduced-moisture environment. 21. A method for making an optical preform, comprising: placing an internal-vapor-deposition machine in a reduced-moisture environment having a moisture content of less than 5 g/kg;maintaining the reduced-moisture environment's moisture content of less than 5 g/kg for a period of at least seven days;positioning a glass substrate tube in the internal-vapor-deposition machine within the reduced-moisture environment;depositing glass layers onto the interior surface of the glass substrate tube via PCVD deposition or MCVD deposition, wherein the glass deposition proceeds in the reduced-moisture environment, which is maintained at a moisture content of less than 5 g/kg; andthereafter, contracting the glass substrate tube into an optical preform. 22. The method according to claim 21, wherein the glass deposition step proceeds in a reduced-moisture environment that is maintained at a moisture content of less than 2 g/kg. 23. The method according to claim 21, wherein the step of contracting the glass substrate tube into an optical preform is performed in an environment having a moisture content of less than 5 g/kg. 24. The method according to claim 21, wherein the step of contracting the glass substrate tube into an optical preform is performed in a reduced-moisture environment having a moisture content of less than 2 g/kg. 25. The method according to claim 21, wherein the deposition step comprises a PCVD deposition step. 26. The method according to claim 21, wherein the step of maintaining the reduced-moisture environment's moisture content is performed for at least ten days.