Journal ArticleDOI
An optical heterodyne mixer providing image-frequency rejection
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TLDR
In this article, an optical heterodyne mixer was proposed to detect a desired signal at a desired image frequency while rejecting interference from any signal at the image frequency f{LO} \pm f{IF}.Abstract:
This paper describes an optical heterodyne mixer which detects a desired signal at frequency f_{LO} \pm f_{IF} while rejecting interference from any signal at the image frequency f_{LO} \pm f_{IF} . Implementation of the mixer is relatively simple. Its performance is insensitive to fluctuations in the optical dimensions of the circuit. This mixer is particularly attractive for communication systems using wavelength division multiplex techniques.read more
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Journal ArticleDOI
Optical FDM transmission technique
K. Nosu,H. Toba,K. Iwashita +2 more
TL;DR: In this article, the present state of optical frequency division multiplexing (optical FDM) technologies and the future prospects for these applications are discussed, as well as the current state of the related technologies and their future prospects.
Patent
Active image separation mixer
TL;DR: In this paper, a mixer separates IF components IF1, IF2 of the same frequency which are images of different frequency RF signals RF1, RF2 beating with a given LO signal is applied to a FET active power divider and applied to the drains of a pair of balanced FET mixing elements.
Journal ArticleDOI
Densely spaced FDM coherent star network with optical signals confined to equally spaced frequencies
Bernard Glance,Julian Stone,K.J. Pollock,P.J. Fitzgerald,Charles A. Burrus,Bryon L. Kasper,L.W. Stulz +6 more
TL;DR: In this article, the results obtained with a fiber-optical star network using densely spaced frequency-division-multiplexing (FDM) and heterodyne detection techniques are discussed.
Patent
Optical communication system with a stabilized "comb" of frequencies
TL;DR: An optical communication system in which a group, or "comb", of intelligence-bearing signals are frequency-division-multiplexed and stabilized using a corresponding "comb" of resonances associated with a Fabry-Perot cavity is described in this article.
Journal ArticleDOI
Ultracompact, all-passive optical 90 degrees -hybrid on InP using self-imaging
TL;DR: In this paper, a self-imaging GaInAsP/InP multimode waveguide was realized using self-image and achieved excellent performance (splitting ratio of 97:99:104: 99, low on-chip insertion losses > 0.
References
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Journal ArticleDOI
A dual-detector optical heterodyne receiver for local oscillator noise suppression
TL;DR: In this paper, the performance of a dual-detector optical heterodyne receiver was analyzed and compared with that of a conventional singledetector HetNOMA receiver.
Patent
Optical heterodyne receiver with phase or frequency lock
Ross E. Graves,Lyle S. Stokes +1 more
TL;DR: In this paper, an improved optical heterodyne receiver is proposed to provide compensation and tracking for undesired phase and frequency excursions of both the received and the local oscillator signals, which is useful in optical communications systems having wideband variations in the frequency of the received signal caused by Doppler shifts and angle-modulated noise components.
Patent
Polarization independent coherent optical heterodyne receivers
TL;DR: In this paper, coherent optical heterodyning (OCH) receivers are proposed to mix a received optical signal including an arbitrary polarization state, and a local oscillator signal, including a fixed polarization states, while providing a performance independent of the polarization direction of a received signal.
Patent
Dual channel phase locked optical homodyne receiver
Frank E. Goodwin,Ross E. Graves +1 more
TL;DR: In this paper, an improved homodyne receiver for wideband optical communications systems is described. The receiver utilizes dual channelization of the optical input signal in the manner of a Costas two-phase synchronous receiver, which is capable of phase-locked operation in the presence of noise and frequency variations in the received and local oscillator signals.
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