Device and method to supress Q-switching in an optical amplifyin

Details Device and method to supress Q-switching in an optical amplifyin Device and method to supress Q-switching in an optical amplifyin

1997-06-18

1998-09-01

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359127, 359634, H04B 900

Patent

active

058018794

ABSTRACT:
An improved four-port dichroic WDM, for use in a multiwavelength, bi-directional optical amplifier, having a dichroic filter for substantially reflecting a first wavelength band input to the WDM to an output of the WDM for the first wavelength band and for substantially transmitting a second wavelength band input to the WDM to an output of the WDM for the second wavelength band, in which some of a first 3 dB wavelength in the first wavelength band is transmitted by the filter and some of a second 3 dB wavelength in the second wavelength band is reflected by the filter, includes another dichroic filter having a filter function different than the filter function of the WDM filter providing an insertion loss for the first or the second 3 dB wavelengths sufficient to reflect and transmit, respectively, substantially all of the first and second 3 dB wavelengths. Additional dichroic filters for suppressing 3 dB light are used to prevent Q-switching in an optical gain cavity in a multiwavelength, bi-directional optical amplifier formed by a reflection point in an optical path connected to the amplifier.

REFERENCES:
patent: 4910727 (1990-03-01), Fussganger
patent: 4972513 (1990-11-01), Mochizuki et al.
patent: 5295011 (1994-03-01), Heise
patent: 5317660 (1994-05-01), Veith
patent: 5375010 (1994-12-01), Zervas et al.
patent: 5452124 (1995-09-01), Baker

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