Diffraction grating and dispersion compensation circuit
First Claim
1. A diffraction grating comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively,(a) the first block including:
- a plurality of first input waveguides;
a first star coupler connected to the first input waveguides; and
a plurality of first output waveguides connected to the first star coupler;
(b) the second block having a plurality of groove structures that are formed on a substrate and in each of which a holey fiber is embedded;
(c) the third block including;
a plurality of delay waveguides; and
grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; and
(d) the fourth block including;
a plurality of second input waveguides;
a second star coupler connected to the second input waveguides; and
a plurality of second output waveguides connected to the second star coupler.
1 Assignment
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Accused Products
Abstract
A diffraction grating of the present invention includes a first block (101) and a second block (102). The first block (101) is made up of a plurality of input waveguides (103), a slab waveguide (104), a delay waveguide array (105) and narrow grooves (106): each of which being filled with resin. The second block (102) is made up of a plurality of input waveguides (107), a slab waveguide (108) and a plurality of output waveguides (109). Since a circuit is cut off at the ends of the arrayed waveguides, a relative phase can easily be measured. The resin has undergone a refractive-index adjustment and compensates a phase error.
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Citations
5 Claims
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1. A diffraction grating comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively,
(a) the first block including: -
a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of first output waveguides connected to the first star coupler; (b) the second block having a plurality of groove structures that are formed on a substrate and in each of which a holey fiber is embedded; (c) the third block including; a plurality of delay waveguides; and grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; and (d) the fourth block including; a plurality of second input waveguides; a second star coupler connected to the second input waveguides; and a plurality of second output waveguides connected to the second star coupler.
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2. A dispersion compensation circuit comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively,
(a) the first block including: -
a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of output waveguides connected to the first star coupler; (b) the second block having a plurality of groove structures that are formed on a substrate and in each of which a holey fiber is embedded; (c) the third block including; a plurality of delay waveguides; and grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; and (d) the fourth block including; a plurality of second input waveguides; a slab waveguide connected to the second input waveguides; grooves that are provided on an optical path of the slab waveguide, each of which being filled with an organic material; a heater provided around the grooves; and a mirror that is provided at an end of the slab waveguide and that is disposed on an end face of a substrate.
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3. A dispersion compensation circuit comprising a first block, a second block, a third block, a fourth block, a fifth block, a sixth block and a seventh block, the first to seventh blocks being connected together in this order,
(a) the first block including: -
a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of first output waveguides connected to the first star coupler; (b) the second block having a plurality of first groove structures that are formed on a substrate and in each of which a first holey fiber is embedded; (c) the third block including; a plurality of delay waveguides; and first grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; (d) the fourth block including; a plurality of second input waveguides; a slab waveguide connected to the second input waveguides; second grooves that are provided on an optical path of the slab waveguide, each of which being filled with an organic material; a heater provided around the second grooves; and a plurality of second output waveguides connected to the slab waveguide; (e) the fifth block including; a plurality of second delay waveguides; and third grooves that are provided instead of a part of the second delay waveguides, each of which being filled with an organic material; (f) the sixth block having a plurality of second groove structures that are formed on the substrate and in each of which a second holey fiber is embedded; (g) the seventh block including; a plurality of third input waveguides; a second star coupler connected to the third input waveguides; and a plurality of third output waveguides connected to the second star coupler.
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4. A diffraction grating comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively,
(a) the first block including: -
a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of first output waveguides connected to the first star coupler; (b) the second block including; an input waveguide substrate having a plurality of second input waveguides; substrates, each of which has a delay waveguide or a delay line in which a holey fiber is embedded, the delay waveguide or the delay line being connected to the second input waveguides, respectively, of the input waveguide substrate; and an output waveguide substrate having a plurality of second output waveguides, each of which being connected to the delay waveguide or to the delay line of the substrate; (c) the third block including; a plurality of delay waveguides; and grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; (d) the fourth block including; a plurality of third input waveguides; a second star coupler connected to the third input waveguide; and a plurality of third output waveguides connected to the second star coupler.
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5. A diffraction grating comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively,
(a) the first block including: -
a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of first output waveguides connected to the first star coupler; (b) the second block including; an input waveguide substrate having a plurality of second input waveguides; a cylindrical bobbin on which holey fibers connected to the second input waveguides, respectively, of the input waveguide substrate are wound; and an output waveguide substrate having a plurality of second output waveguides connected to the holey fibers, respectively; (c) the third block including; a plurality of delay waveguides; and grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; and (d) the fourth block including; a plurality of third input waveguides; a second star coupler connected to the third input waveguides; and a plurality of third output waveguides connected to the second star coupler.
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Specification