Optical attenuating isolator

An optical attenuating isolator comprising:

• a first collimator connected to a first optical transmission medium, the first collimator for collimating light received via the first optical transmission medium;
• an isolation unit for receiving the output light of the first collimator and passing only polarized light which is polarized in a predetermined specific polarization direction;
• an optical attenuating filter for attenuating polarized light which has passed through the isolation unit;
• and
• a second collimator connected to a second optical transmission medium, the second collimator for collimating polarized light which has passed through the optical attenuating filter, and transmitting the resultant light to the second optical transmission medium.

An optical attenuating isolator comprising:

• a polarizer for passing only light which is polarized in a direction that is the same as the direction of polarization of the polarizer, among the received light;
• an optical attenuating filter for attenuating polarized light which has passed through the polarizer;
• a Faraday rotator for rotating attenuated light which has passed through the optical attenuating filter, a predetermined number of degrees;
• and
• an analyzer for passing only light which is polarized in a direction that is the same as the direction of the analyzer, among the rotated light.

An optical attenuating isolator comprising:

• a polarizer for passing only light which is polarized in a direction that is the same as the direction of polarization of the polarizer, among the received light;
• a Faraday rotator for rotating polarized light which has passed through the polarizer, a predetermined number of degrees;
• an optical attenuating filter for attenuating light which has passed through the Faraday rotator;
• and
• an analyzer for passing only light which is polarized in a direction that is the same as the direction of the analyzer, among the light received from the optical attenuating filter.

An optical attenuating isolator, comprising:

• a first optical transmission medium;
• a first collimator connected to the first optical transmission medium, for collimating light from the first optical transmission medium;
• a polarizer for polarizing light passed by the first collimator;
• a variable optical attenuator for variably attenuating the polarized light passed by the polarizer;
• a Faraday rotator for rotating substantially by 45° the polarization of the light passed by the variable optical attenuator;
• an analyzer for passing light from the Faraday rotator having a particular polarization direction;
• a second collimator for receiving light from the analyzer;
• and
• a second optical transmission medium for transmitting light from the second collimator.

An optical attenuating isolator, comprising:

• a first optical transmission medium;
• a first collimator connected to the first optical transmission medium, for collimating light from the first optical transmission medium;
• a polarizer for polarizing light passed by the first collimator;
• a Faraday rotator for rotating substantially by 45° the polarization of the light passed by the polarizer;
• a variable optical attenuator for variably attenuating the polarized light passed by the Faraday rotator;
• an analyzer for passing light from the variable optical attenuator having a particular polarization direction;
• a second collimator for receiving light from the analyzer;
• and
• a second optical transmission medium for transmitting light from the second collimator.