Filter insertion type of optical branch apparatus

Details Filter insertion type of optical branch apparatus Filter insertion type of optical branch apparatus

1997-11-21

1999-09-07

Ngo, Hung N.

Optical waveguides

Integrated optical circuit

385 45, G02B 612

Patent

active

059499281

ABSTRACT:
An optical filter is provided to be on a side of the output ports relative to a branch port of the first stage in an optical branch apparatus. The optical filter transmits a signal light and reflects a monitor light, so that signal lights are obtained at output ports, and the monitor light is returned to an optical transmitter to detect an abnormal state of an optical fiber transmission line.

REFERENCES:
patent: 5064263 (1991-11-01), Stein
patent: 5355424 (1994-10-01), Idler et al.
patent: 5799120 (1998-08-01), Kurata et al.

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