Patent
Optical communication apparatus and control method of optical communication apparatus
TLDR
In this paper, an optical amplifier, a light reception element, and a controller are configured to decrease a gain of the optical amplifier according to an optical signal power input to the optical amplifiers in response to a detection of a recovery of the light reception signal from an interruption of optical signal.Abstract:
Provided are an optical amplifier, a light reception element, and a controller configured to decrease a gain of the optical amplifier according to an optical signal power input to the optical amplifier in response to a detection of a recovery of the optical signal input to the optical amplifier from an interruption of the optical signal and to increase the gain of the optical amplifier so that an input optical power to the light reception element approaches a target value after the decreasing of the gain.read more
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Patent
Optical transceiver implementing erbium doped fiber amplifier
TL;DR: An optical transceiver that installs an optical modulator with the Mach-Zehnder type and made of primarily semiconductor materials, and an Erbium Doped Fiber Amplifier (EDFA) is disclosed in this paper.
Patent
Optical fiber link monitoring apparatus and method capable of trace-based automatic gain control
TL;DR: In this article, a variable gain amplifier (VGA), an analog/digital converter (ADC), and a controller are used to detect a failure in an optical fiber link by analyzing a trace of a received signal that has been transmitted to and reflected from said optical fiber links.
Patent
Interference cancellation repeater
Nagwon Kwon,Hyunchae Kim +1 more
TL;DR: In this paper, an interference cancellation repeater for canceling an interference signal included in an input signal including a first adaptive filter configured to generate a first estimated signal, a second adaptive filter configuring to generate the second estimated signal.
Patent
Surge light intensity adjustment method for optical fiber laser apparatus and optical fiber laser apparatus
TL;DR: In this article, a surge light intensity adjustment method for an optical fiber laser apparatus comprising a control unit for performing feedback control on an excitation laser light source so that light intensity of laser output light is closer to a target value is presented.
References
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Patent
Optical amplifier and optical transmission apparatus
Tsukasa Takahashi,Hiroyuki Itou,Yuji Tamura,Michikazu Shima,Kazuo Yamane,Yumiko Kawasaki,Keisuke Imai,Yoshinori Ohkuma,Kazuhiro Suzuki,Yasunori Nagakubo,Takashi Tsuda,Yuji Miyaki +11 more
TL;DR: In this paper, the optical amplifier includes a doped fiber doped with a rare earth element, a pumping light source, and detection means for detecting whether or not amplified signal light is included in light outputted from the doped fibre, and means for decreasing the intensity of the pumping light when it is detected that Amplified Signal Light is not included.
Patent
Method and apparatus for suppressing transients in optical amplifiers
TL;DR: In this paper, a transient suppression system for an optical amplifier having a specifiable total output optical power is presented. But the system is not suitable for the use of optical service channels and it cannot be used in the presence of spontaneous emissions.
Patent
Method of operating a noise-compensating gain controller for an optical amplifier
TL;DR: In this article, a method of operating a noise compensating gain controller in an optical amplifier to avoid overshoot of a selected gain level during amplification transients is provided, where the first step of the method includes the computation of a difference in the amount of amplification necessary to bring the combination of the signal and noise component forming the optical output to the desired gain level.
Patent
Demultiplexing and clock-recovery circuit
Benny Mikkelsen,Gregory Raybon +1 more
TL;DR: In this paper, an optical element for simultaneously retrieving the tributary data rate and the clock frequency from the line rate of an OTDM signal is presented. But the clock recovery principle is based on injection locking of a high-Q-filtered and high gain loop with a variable phase delay and an EA-modulator with high nonlinear response, i.e., absorption verses applied voltage.
Patent
Optical fiber amplifier with improved performance
TL;DR: In this article, a method for controlling a variation in gain in an optical amplifier stage and an optical amplifier is presented, with a control unit for determining a change in an input power of the optical amplifier.