公开(公告)号：JPH07211977A

公开(公告)日：1995-08-11

申请号：JP33422994

申请日：1994-12-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： PIERO GAMUBIINI

IPC: H01S3/137 ,  H01S3/13 ,  H01S5/068 ,  H01S5/0687

Abstract: PURPOSE: To remove the inconvenience caused by free-space propagation of radiation to be stabilized, by a method wherein the radiation emitted by a laser is brought into interaction with a gas while it is led along an optical waveguide and the optical waveguide creates an evanescent field wherein the radiation passes through an environment including the gas and propagates outside the waveguide. CONSTITUTION: A signal from a semiconductor laser 1 is sent to a fiber stub 2, passed through a power splitter device 3 and divided thereby in two. A part for stabilization is sent to an optical phase modulator 4 driven by a high-frequency signal supplied by a generator 5. The phase-modulated signal is collected by a fiber 6 being an optical waveguide a considerable part of the length of which passes inside a cell 7 filled with a gas having an absorption line usable for stabilization of the wavelength of the light source 1. The fiber 6 enters the cell 7 through an aperture and ends on a photodetector 8 outside the cell 7 and an output thereof is connected to a mixer 9 receiving the signal from the generator 5.

公开(公告)号：JPH07221708A

公开(公告)日：1995-08-18

申请号：JP33423194

申请日：1994-12-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： PIERO GAMUBIINI ,  EMIRIO BUETSUTSUOONI

IPC: H04B10/00 ,  H04B10/02 ,  H04L7/00 ,  H04Q3/00 ,  H04L12/28

Abstract: PURPOSE: To compensate the delay caused by possible difference in optical routes in a node by utilizing dispersion dependence on wavelength in an optical fiber. CONSTITUTION: In an optical ATM node, a synchronized ATM cell is sent into the segment of an optical fiber (FD) having high time dispersion and a prescribed length. ATM cell transmission is performed after the cell is converted into such an optical carrier at a tunable wavelength converter (CL) that reaches the input sides of the switching elements (Em1,..., Emh) of a node (NC) at a prescribed moment as a result of the fact that the cell has a wavelength different from the original wavelength of the cell and passes through the optical fiber (FD).