Patent
Device for optical heterodyne detection of an optical signal beam and optical transmission system provided with such a device
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TLDR
In this article, an optical heterodyne detection device is described in which with the aid of three controllable elements (A, B and C) to influence the state of polarisation and having a limited control range, such as Faraday rotators or birefringent electro-optical crystals, the state is made to correspond to the signal beam transmitted through a long-distance transmission fibre.Abstract:
An optical heterodyne detection device is described in which with the aid of three controllable elements (A, B and C), to influence the state of polarisation and having a limited control range, such as Faraday rotators or birefringent electro-optical crystals, the state of polarisation of radiation originating from a local oscillator (30) is made to correspond to the signal beam transmitted through a long-distance transmission fibre (10).read more
Citations
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Patent
Polarization controller for use in optical fiber communication system
TL;DR: In this article, a state-of-polarization (SOP) controller for a fiber optic communication system is described, which consists of liquid crystal variable optical retarders (40, 42 and 44) that adjust the polarization state of local optical signal (36) in response to voltages provided by the CPU (24).
Patent
Wavelength-selective polarization-diverse optical heterodyne receiver
Douglas M. Baney,Wayne V. Sorin +1 more
TL;DR: In this paper, a system for monitoring an optical signal includes an optical heterodyne detection system in which an input signal and a swept local oscillator signal are combined to generate a combined optical signal.
Patent
Fiber polarimeter, the use thereof, as well as polarimetric method
TL;DR: A fiber polarimeter has one or more oblique fiber Bragg gratings disposed one behind the other in a fiber as mentioned in this paper, which couple out portions of a light wave input to the fiber depending on its polarization.
Patent
Polarization diversity receiver with planar waveguide and polarizing beam splitter
TL;DR: In this article, a planar waveguide optical coupler and a polarizing beam splitter were used to detect orthogonally polarized beams. But they were attached to opposite sides of a polarization rotator.
Patent
Optical mixing device
TL;DR: In this paper, the first and second input optical signals are separated into polarized optical signals having different polarization planes, and then the mixed signals are focused using an acute crossed angle in a mixer.
References
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Journal ArticleDOI
Polarization stabilization on single‐mode fiber
TL;DR: In this article, the state of polarization at the output end of a long nominally circular single-mode optical fiber is stabilized by an active control system, which contains a polarimeter and two electromagnetic fiber squeezers which introduce variable amounts of stress birefringence directly into the fiber.
Journal ArticleDOI
Optical polarisation control utilising an optical heterodyne detection scheme
T. Imai,K. Nosu,H. Yamaguchi +2 more
TL;DR: In this paper, an optical polarisation control scheme using optical heterodyne detection for coherent transmission is proposed and demonstrated at a wavelength of 1.5 µm, at a received optical power level of less than -70 dBm.
Journal ArticleDOI
New polarisation-control scheme for optical heterodyne receiver using two Faraday rotators
TL;DR: In this paper, a new state-of-polarisation (SOP) control scheme using two Faraday rotators is proposed, which features low optical insertion loss and quick response.
Patent
Process and apparatus for the coherent detection and demodulation of a phase-modulated carrier wave in a random polarization state
Michel Monerie,Alain Leclert +1 more
TL;DR: In this article, the demodulation signals of these two channels are combined, and in particular added, and the resulting signal makes it possible to recover the information independently of the polarization state of the incident wave.
Patent
Coherent optical receivers.
TL;DR: In this article, a phase splitter is employed to divide the optical signal powers of the input and local oscillator signals evenly between the in-phase and the quadrature detectors.