Single mode dispersion compensating optical fiber

A dispersion and dispersion slope compensating optical fiber, comprising:

• a central core segment having a relative refractive index wherein the central core segment has an outer radius of within the range of about 2.2 μm to about 2.8 μm;
• a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment wherein the depressed moat segment has an outer radius of within the range of from about 3.5 μm to about 6.0 μm;
• an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment wherein the annular ring segment has a central radius of within the range of from about 6.0 μm to about 8.5 μm and a width of about 4.0 μm;
• and a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment;
• and wherein the relative refractive indices are selected to provide:
• negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm;
• and
• a fiber cut-off wavelength of less than about 1650 nm.

A dispersion and dispersion slope compensating optical fiber, comprising:

• a central core segment having a relative refractive index;
• a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment;
• an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment;
• and a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment;
• wherein the ratio of an outer radius of the central core segment to an outer radius of the depressed moat segment is within the range of from about 0.44 to about 0.55
• and wherein the relative refractive indices are selected to provide:
• negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm;
• and
• a fiber cut-off wavelength of less than about 1650 nm.

A dispersion and dispersion slope compensating optical fiber, comprising:

• a central core segment having a relative refractive index, wherein the central core segment has an outer radius within the range of from about 2.2 μm to about 2.8 μm and the relative refractive index of the central core segment is within the range of from about 1.4% to about 2.4%;
• a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment nm, wherein the depressed moat segment has an outer radius within the range of about 3.5 μm to about 6.0 μm, and the relative refractive index of the depressed moat segment is less than or equal to about −0.65%;
• an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment, and wherein the annular ring segment has a central radius within the range of from about 6.0 μm to about 8.5 μm and a width of about 4.0 μm, and a relative refractive index of the annular ring segment is within the range of from about 0.1% to about 0.3%;
• and a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment;
• and wherein the relative refractive indices are selected to provide:
• negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm;
• and
• a fiber cut-off wavelength of less than about 1650.

An optical fiber communication system, comprising:

• an optical transmitter adapted to transmit an optical signal;
• a transmitting fiber in optical communication with the transmitter;
• a dispersion and dispersion slope compensating optical fiber in optical communication with the transmission fiber, the optical fiber comprising:
• a central core segment having a relative refractive index;
• a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment, the relative refractive index of the depressed moat segment being less than −0.65%;
• an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment;
• and
• a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment;
• and
• an optical receiver in optical communication with the compensating fiber;
• and
• wherein the relative refractive indices of the compensating fiber are selected to provide within the compensating fiber:
• negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm having a dispersion of about −240 ps/nm-km to about −140 ps/nm-km at a wavelength of about 1550 nm;
• negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm;
• and
• a fiber cut-off wavelength of less than about 1550 nm.

A dispersion and dispersion slope compensating optical fiber, comprising:

• a central core segment having a relative refractive index;
• a depressed moat segment on the periphery of the central core segment and having a relative refractive index that is less than the relative refractive index of the central core segment and further is less than −0.65%;
• an annular ring segment on the periphery of the depressed moat segment and having a relative refractive index that is less than the relative refractive index of the central core segment and greater that the relative refractive index of the depressed moat segment;
• and a cladding layer on the periphery of the annular ring segment and having a relative refractive index that is less that the relative refractive index of the annular ring segment and greater than the relative refractive index of the depressed moat segment;
• and wherein the relative refractive indices are selected to provide:
• negative dispersion at a wavelength of within the range of from about 1530 nm to about 1620 nm and a dispersion of about −240 ps/nm-km to about −140 ps/nm-km at a wavelength of about 1550 nm;
• negative dispersion slope at a wavelength of within the range of from about 1530 nm to about 1620 nm;
• a kappa value of within the range of about 40 to about 60 at a wavelength of about 1550 nm;
• a fiber cut-off wavelength of less than about 1650 nm;
• and
• a core-moat ratio, defined as an outer radius of the central core segment divided by an outer radius of the depressed moat segment, of between 0.44 to 0.55.