Wideband hollow core transmission fiber and DWDM lightwave transmission system in the 2000 nm wavelength region
A long-distance DWDM lightwave transmission system operating in the 2000 nm wavelength region is proposed that is based on the utilization of hollow core fiber configured to exhibit low loss (e.g., on the order of 0.02 dB/km) in combination with a hybrid TDFA/HDFA repeater device. Multiple concatenated spans of the combination of the hollow core fiber and hybrid TDFA/HDFA repeater device are able to provide communication over path lengths in excess of 10,000 km without the need for electronic regeneration of the propagating signals. In one case, the hollow core fiber is configured as a double-nested anti-resonant nodeless fiber (DNANF) with the number of nested structures and their various parameters optimized to provide the low loss operation in the 2000 nm region.
1 . An all-optical dense wavelength division multiplexed (DWDM) lightwave transmission system operating in the 2000 nm region, the system comprising:
a pair of separated optical transceiver stations defined as a first transceiver station and a second transceiver station; and
an optical fiber signal path between the transceiver stations for supporting bi-directional DWDM lightwave transmission between the first transceiver station and the second transceiver station,
where the optical fiber signal path comprises a plurality of N bi-directional transmission spans, each bi-directional transmission span comprising a hybrid TDFA/HDFA repeater device in each direction and a section of hollow core fiber coupled to the output of the repeater device,
wherein DWDM lightwave transmission between the first transceiver station and the second transceiver station is supported along the signal paths without requiring electrical regeneration of the propagating optical signals,
wherein each section of hollow core fiber comprises a section of double-nested anti-resonant nodeless fiber (DNANF), and
wherein each section of DNANF includes a set of five double-nested fiber elements.
2 . The system as defined in claim 1 , wherein the set of five double-nested fiber elements is disposed in an arrangement that forms a pentagonal-shaped central hollow core optical signal path.
3 . The system as defined in claim 1 , wherein each section of hollow core fiber has a bandwidth of 380 nm.
4 . The system as defined in claim 3 , wherein the bandwidth of about 380 nm spans the wavelength range of 1720 nm to 2100 nm.
5 . The system as defined in claim 1 , wherein the system operates in the range of 1725-2100 nm.
6 . An all-optical dense wavelength division multiplexed (DWDM) lightwave transmission system operating in the 2000 nm region, the system comprising:
a pair of separated optical transceiver stations defined as a first transceiver station and a second transceiver station; and
an optical fiber signal path between the transceiver stations for supporting bi-directional DWDM lightwave transmission between the first transceiver station and the second transceiver station,
where the optical fiber signal path comprises a plurality of N bi-directional transmission spans, each bi-directional transmission span comprising a hybrid TDFA/HDFA repeater device in each direction and a section of hollow core fiber coupled to the output of the repeater device,
wherein DWDM lightwave transmission between the first transceiver station and the second transceiver station is supported along the signal paths without requiring electrical regeneration of the propagating optical signals,
wherein each section of hollow core fiber comprises a section of double-nested anti-resonant nodeless fiber (DNANF), and
wherein each section of DNANF exhibits an ideal loss no greater than 0.035 dB/km.
7 . The system as defined in claim 6 , wherein each section of DNANF exhibits an ideal loss of no more than 0.030 dB/km.