Optical time-domain reflectometer (otdr) including channel checker
AssigneeViavi Solutions Inc.
InventorVincent LECOEUCHE
Life of this patent
Estimating the term…
Abstract
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.
Claims20
A channel checker optical time-domain reflectometer (OTDR) comprising:
- a first laser source to emit a first laser beam;
- a second laser source to emit a second laser beam;
- a photodiode to acquire a beat frequency between the first laser beam and the second laser beam, wherein the beat frequency is used to maintain a predetermined offset frequency shift between the first laser beam and the second laser beam, wherein the predetermined offset frequency shift is relative to a predetermined frequency of either the first laser beam or the second laser beam;
- a modulator to modulate the first laser beam, wherein the modulated first laser beam is to be injected into a device under test (DUT);
- and
- a coherent receiver to acquire a backscattered signal from the DUT, wherein the backscattered signal results from the modulated first laser beam injected into the DUT, and wherein the coherent receiver is to use the second laser beam as a local oscillator to determine Brillouin and Rayleigh traces with respect to the DUT based on the predetermined offset frequency shift between the first laser beam and the second laser beam.
A channel checker optical time-domain reflectometer (OTDR) comprising:
- a first laser source to emit a first laser beam;
- a second laser source to emit a second laser beam;
- a photodiode to acquire a beat frequency between the first laser beam and the second laser beam, wherein the beat frequency is used to maintain a predetermined offset frequency shift between the first laser beam and the second laser beam;
- a modulator to modulate the first laser beam, wherein the modulated first laser beam is to be injected into a device under test (DUT);
- and
- a coherent receiver to acquire a backscattered signal from the DUT, wherein the backscattered signal results from the modulated first laser beam injected into the DUT.
A channel checker optical time-domain reflectometer (OTDR) comprising:
- a photodiode to acquire a beat frequency between a first laser beam and a second laser beam, wherein the beat frequency is used to maintain a predetermined offset frequency shift between the first laser beam and the second laser beam;
- a modulator to modulate the first laser beam, wherein the modulated first laser beam is to be injected into a device under test (DUT);
- and
- a coherent receiver to acquire a backscattered signal from the DUT.
Dependencies are inferred from the claim text.