Impairment generation

1. A method comprising:

generating, by a component of a coherent optical transceiver, an impairment within the coherent optical transceiver;

generating, by the coherent optical transceiver, a light signal from an electrical signal, the light signal having a wavelength of light encoded with coherent optical data impaired by the impairment;

transmitting, by the coherent optical transceiver, the light signal from an output of the coherent optical transceiver to an input of the coherent optical transceiver;

removing, by the coherent optical transceiver, the impairment in the light signal; and

recovering, by the coherent optical transceiver, the wavelength of the light encoded with the coherent optical data.

2. The method of claim 1 , further comprising:

coupling the coherent optical transceiver to a second coherent optical transceiver to couple the light signal with the impairment;

transmitting, by the coherent optical transceiver, the light signal with the impairment to the second coherent optical transceiver;

removing, by the second coherent optical transceiver, the impairment; and

decoding, by the second coherent optical transceiver, the light signal to the electrical signal.

3. The method of claim 1 , further comprising:

generating, by a digital signal process (DSP), the impairment in a digital signal; and

creating the light signal using the digital signal.

4. The method of claim 1 , further comprising:

adjusting, by a device controller of the coherent optical transceiver, a setting of the component of the coherent optical transceiver; and

creating the impairment based on the setting.

5. The method of claim 1 , further comprising:

generating a set of samples according to a random distribution;

generating the impairment based on the set of samples, wherein the impairment is noise; and

simulating an addition of noise using the samples to augment a set of values.

6. The method of claim 3 , wherein the component that is adjusted comprises a plurality of electric amplifiers.

7. The method of claim 6 , wherein adjusting comprises changing a signal ratio of a first electric amplifier of the plurality of electric amplifiers to a second electric amplifier of the plurality of electric amplifiers.

8. The method of claim 1 , wherein the impairment is at least one of dispersion, skew, polarization skew, optical noise, In-phase/Quadrature imbalance, differential group delay, polarization mode dispersion, frequency offset or amplified spontaneous emission, polarization scrambling, polarization dependent loss, or combinations thereof.

9. An apparatus for generating an impairment for a wavelength of light in a coherent optical system, the apparatus comprising:

a coherent optical transceiver to:

generate an impairment;

generate a light signal of a wavelength of light encoded with coherent optical data impaired with the impairment;

transmit the light signal from an output of the coherent optical transceiver to an input of the coherent optical transceiver;

remove the impairment in the light signal; and

recover the wavelength of light encoded with the coherent optical data to form encoded data.

10. The apparatus of claim 9 , wherein the coherent optical transceiver comprises a digital signal processor (DSP) to generate the impairment in a digital signal by changing settings of the DSP, and wherein the digital signal is used to create the light signal.

11. The apparatus of claim 9 , wherein the coherent optical transceiver comprises a device controller to adjust a device of the coherent optical transceiver to create the impairment.

12. The apparatus of claim 11 , wherein the coherent optical transceiver comprises electric amplifiers; wherein to adjust the device comprises adjusting the electric amplifiers.

13. The apparatus of claim 12 , wherein to adjust the device comprises changing a signal ratio of a first electric amplifier of the electric amplifiers to a second electric amplifier of the electric amplifiers.

14. The apparatus of claim 9 , wherein the impairment is one of at least dispersion, skew, polarization skew, optical noise, In-phase/Quadrature imbalance, differential group delay, or amplified spontaneous emission.

15. A method comprising:

generating, by a component of a coherent optical transceiver, an impairment within the coherent optical transceiver;

encoding, coherent data on a wavelength of light;

combining the wavelength of light and the impairment to form a light signal;

transmitting the light signal from an output of the coherent optical transceiver to an input of the coherent optical transceiver;

removing, by the coherent optical transceiver, the impairment in the light signal; and

decoding, by the coherent optical transceiver, the wavelength of light encoded with coherent optical data to form encoded data.

16. The method of claim 15 , further comprising:

generating, by a digital signal process (DSP), the impairment in a digital signal; and

creating the light signal using the digital signal.

17. The method of claim 15 , further comprising:

adjusting, by a device controller of the coherent optical transceiver, a setting of the component of the coherent optical transceiver; and

creating the impairment based on the setting.

18. The method of claim 17 , wherein the coherent optical transceiver comprises electric amplifiers; wherein adjusting the component comprises adjusting the electric amplifiers.

19. The method of claim 18 , wherein adjusting comprises changing a signal ratio of a first electric amplifier of the electric amplifiers to a second electric amplifier of the electric amplifiers.

20. The method of claim 15 , wherein the impairment is at least one of dispersion, skew, polarization skew, optical noise, In-phase/Quadrature imbalance, differential group delay, polarization mode dispersion, frequency offset or amplified spontaneous emission, polarization scrambling, polarization dependent loss, or combinations thereof.