Abstract
This paper briefly describes the principle of phase locking an oscillator before concentrating on the stability and phase error variance characteristics of an optical phase locked loop. In this regard three modified versions of an optical phase-lock loop (OPLL) have been proposed where in it is possible to considerably minimize the deleterious effects of the loop propagation delay on the performance of an OPLL.
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Abbreviations
- c :
-
Velocity of the light in free space
- I :
-
Drive current of the laser
- I th :
-
Threshold current of the laser
- L :
-
Cavity length of the laser
- n :
-
Refractive index
- P L :
-
Synchronized laser output power
- P t , P o :
-
Received and slave laser output powers
- R′ :
-
Laser facett reflectivity
- α′:
-
Internal loss of the laser source
- α(t), β(t):
-
Quantum phase noise of the transmitter laser and the local laser
- ω r :
-
Angular frequency of received signal
- ω o :
-
Angular frequency of local laser source
- Θ r (t):
-
Phase modulation of the output of the local laser source
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Pal, S., Mandal, S. & Biswas, B.N. On the Newer Methods of Improving the Performance of OPLL. J. Inst. Eng. India Ser. B 96, 401–413 (2015). https://doi.org/10.1007/s40031-014-0155-3
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DOI: https://doi.org/10.1007/s40031-014-0155-3