Optical demultiplexing module, optical multiplexing module and housings therefor

A housing for an optical demultiplexing module for admitting pumping light into a rare-earth element doped fiber and for passing signal light that is amplified in the rare-earth element doped fiber, comprising:

• a housing body made of a single member in a square or rectangular form,
• a first hollow portion and a second hollow portion which are formed from a top to a bottom surface in a central area of said housing body, said first hollow portion having a first inner surface formed for mounting a reflector mirror as it is inclined at a predetermined angle, said second hollow portion having a space into which an optical isolator is to be inserted and fixed and a second inner surface and a third inner surface provided for mounting a multiplexer and a beam splitter, respectively, as they are inclined at predetermined angles;
• said housing body including means defining a fourth hole between said first hollow portion and said second hollow portion for passing both signal light and pumping light;
• said housing body further including means defining a first hole and a second hole in which a first collimator and a second collimator are mounted, respectively, said first and second holes being formed normal to opposing sides of said housing body;
• said housing body further including means defining a third hole provided in a side of said housing body at right angles to said opposing sides in which a third collimator is mounted normal to said side;
• wherein said first hole, said fourth hole and said second hole are provided so that signal light emitted from the first collimator passes linearly through the multiplexer, the optical isolator and the beam splitter to reach the second collimator, and said first inner surface and said second inner surface readjusted in an angle of incidence so that pumping light emitted from the third collimator is admitted into the first collimator by the reflector mirror and the multiplexer which are to be mounted on said first and second inner surfaces, respectively.

A housing for an optical demultiplexing module for admitting pumping light into a rear-earth element doped fiber and for passing signal light that is amplified in the rare-earth element doped fiber, comprising:

• a housing body made of a single member in a square or rectangular form,
• a first hollow portion and a second hollow portion which are formed from the top to the bottom surface in a central area of said housing body, said first hollow portion having a first inner surface and a second inner surface formed for mounting a reflector mirror and a multiplexer, respectively, as they are inclined at a predetermined angle, said second hollow portion having a space into which an optical isolator is to be inserted and fixed and a third inner surface provided for mounting a beam splitter, respectively, as it is inclined at predetermined angles;
• said housing body including means defining a fourth hole between said first hollow portion and said second hollow portion for passing both the signal light and the pumping light;
• said housing body further including means defining a first hole and a second hole for mounting a first collimator and a second collimator, respectively, said first and second collimators being mounted normal to opposing sides of said housing body;
• said housing body further including means defining a third hole in a side of said housing body at right angles to said opposing sides for mounting a third collimator normal to said side;
• wherein said first hole, said fourth hole and said second hole are provided so that the signal light emitted from the first collimator passes linearly through the multiplexer, the optical isolator and the beam splitter to reach the second collimator, and said first inner surface and said second inner surface are adjusted in angle of incidence so that the pumping light emitted from the third collimator is admitted into the first collimator by the reflector mirror and the multiplexer which are to be mounted on said first and second inner surfaces, respectively.

An optical multiplexing module for admitting both pumping light and signal light into a rare-earth element doped fiber, comprising:

• a square or rectangular housing body;
• a first collimator and a second collimator provided normal to opposing sides of said housing body, respectively;
• a third collimator provided normal to a side of said housing body at right angles to said opposing sides;
• a beam splitter provided on an optical axis of signal light which is admitted into said housing body from said second collimator;
• an optical isolator provided on the optical axis of the light passing through said beam splitter;
• a multiplexer being provided at an output end of the optical isolator, said multiplexer, said optical isolator and said beam splitter being provided in linear alignment;
• and
• a reflector mirror provided on the optical axis of the pumping light to be admitted into aid housing body from said third collimator;
• wherein said first collimator is provided on the optical axis of the light passing through said multiplexer, said multiplexer is provided on the optical axis of pumping the light to be reflected from said reflector mirror, and said first collimator is provided on the optical axis of pumping the light to be reflected from the multiplexer, and
• wherein said pumping light is admitted into said multiplexer at an angle of no more than 22.5 degrees.

A housing for an optical multiplexing module for admitting both pumping light and signal light into a rare-earth element doped fiber, comprising:

• a housing body made of a single member in a square or rectangular shape,
• a first hollow portion and a second hollow portion formed from a top to a bottom surface in a central area of said housing body, said first hollow portion having a first inner surface formed for mounting a reflector mirror as it is inclined at a predetermined angle, said second hollow portion having a space into which an optical isolator is to be inserted and fixed and a second inner surface and a third inner surface provided for mounting a multiplexer and a beam splitter, respectively, inclined at predetermined angles;
• said housing body including means defining a fourth hole provided between said first hollow portion and said second hollow portion for passing both the signal light and the pumping light;
• said housing body further including means defining a first hole and a second hole for respectively mounting a first collimator and a second collimator normal to opposing sides of said housing body;
• said housing body further including means defining a third hole provided in a side of said housing body at right angles to said opposing sides for mounting therein a third collimator normal to said side;
• wherein said second hole, said fourth hole and said first hole are provided so that the signal light emitted from the second collimator passes linearly through the beam splitter, the optical isolator and the multiplexer to reach the first collimator, and said first inner surface and said second inner surface are adjusted in the angle of incidence so that the pumping light emitted from the third collimator is admitted into the first collimator by the reflector mirror and the multiplexer which are to be mounted on said first and second inner surfaces, respectively.

A housing for an optical multiplexing module for admitting both pumping light and signal light into a rare-earth element doped fiber, comprising:

• a housing body made of a single member in a square or rectangular form,
• a first hollow portion and a second hollow portion formed from a top to a bottom surface in a central area of said housing body, aid first hollow portion having a first inner surface and a second inner surface formed for mounting a reflector mirror and a multiplexer, respectively, which are inclined at predetermined angles, said second hollow portion having a space into which an optical isolator is to be inserted and fixed and a third inner surface provided for mounting a beam splitter, respectively, which is inclined at a predetermined angle;
• said housing body including means defining a fourth hole provided between said first hollow portion and said second hollow portion for passing both the signal light and the pumping light;
• said housing further including means defining a first hole and a second hole for respectively mounting a first collimator and a second collimator normal to opposing sidles of said housing body;
• said housing further including means defining a third hole provided in a side of said housing body at right angles to said opposing sides for mounting a third collimator normal to said side;
• wherein said second hole, said fourth hole and said first hole are provided so that the signal light emitted from the second collimator passes linearly through the beam splitter, the optical isolator and the multiplexer to reach the first collimator, and said first inner surface and said second inner surface are adjusted in the angle of incidence so that the pumping light emitting from the third collimator is admitted into the first collimator by the reflector mirror and the multiplexer which are to be mounted on said first and second inner surfaces, respectively.

A housing for an optical demultiplexing/multiplexing module for admitting pumping light into a rare-earth element doped fiber and for allowing signal light to emit after amplification by the rare-earth element doped fiber, comprising:

• a first block for supporting a multiplexer and a reflector mirror;
• a second block for supporting an optical isolator and a beam splitter;
• and
• a frame defined by a pair of opposing first and second sides and another pair of opposing third and fourth sides in a square or rectangular form, said frame having in a central area a hollow portion into which said first and second blocks are to be inserted and fixed, and said frame including means defining a first hole, a second hole and a third hole for fixing a first collimator, second collimator and a third collimator, respectively,
• wherein said first hole, said second hole and said third hole are provided in said first side, said second side and said third side, respectively.