Optical time-domain reflectometer (OTDR) including channel checker
According to examples, a channel checker optical time-domain reflectometer (OTDR) may include a laser source to emit a laser beam. An optical switch may be optically connected to the laser source to receive the laser beam and to selectively transmit the laser beam to a circulator that is optically connected to a device under test (DUT). A first coupler may be optically connected to a first photodiode and to the circulator. A second coupler may be optically connected to the first coupler, the optical switch, and a second photodiode.
1. A channel checker optical time-domain reflectometer (OTDR) comprising:
a laser source to emit a laser beam;
an optical switch that is optically connected to the laser source to receive the laser beam and to selectively transmit the laser beam to a circulator that is optically connected to a device under test (DUT);
a first coupler that is optically connected to a first photodiode and to the circulator; and
a second coupler that is directly optically connected to the first coupler, the optical switch, and a second photodiode.
2. The channel checker OTDR of claim 1 , wherein the laser source includes a continuous-wave (CW) tunable laser source.
3. The channel checker OTDR of claim 1 , wherein the DUT is an optical fiber.
4. The channel checker OTDR of claim 1 , wherein the first coupler includes a 99/1 coupler.
5. The channel checker OTDR of claim 1 , wherein the second coupler includes a 50/50 coupler.
6. The channel checker OTDR of claim 1 , wherein the first photodiode includes an avalanche photodiode.
7. A channel checker optical time-domain reflectometer (OTDR) comprising:
a laser source to emit a laser beam;
a modulator to modulate the laser beam;
an optical switch that is optically connected to the laser source to receive the modulated laser beam and to selectively transmit the modulated laser beam to a circulator that is optically connected to a device under test (DUT);
a first coupler that is optically connected to a photodiode and to the circulator to receive reflected light from the DUT; and
a second coupler that is directly optically connected to the optical switch, the first coupler, and a further photodiode.
8. The channel checker OTDR of claim 7 , wherein the laser source includes a continuous-wave (CW) tunable laser source.
9. The channel checker OTDR of claim 7 , wherein the DUT is an optical fiber.
10. The channel checker OTDR of claim 7 , wherein the first coupler includes a 99/1 coupler.
11. The channel checker OTDR of claim 7 , wherein the second coupler includes a 50/50 coupler.
12. The channel checker OTDR of claim 7 , wherein the photodiode includes an avalanche photodiode.