Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-05-16
1999-08-17
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359125, 359181, H04J 1402
Patent
active
059401966
ABSTRACT:
A wavelength division multiplexer (WDM) in an optical fiber transmission system launches analog signals, for instance a multi-channel television signal. The WDM enhances signal quality by transmitting along a single fiber two different optical wavelength signals, each carrying identical RF information. This results in a 3 dB improvement in carrier to noise ratio. The WDM combines two or more wavelengths centered around for instance 1550 nm or 1310 nm. A typical difference between the two wavelengths is 3 nm. In other embodiments, more than two wavelengths are used. The receiver is for instance a single photosensitive element. The phase of the two RF signals is adjusted in the optical or RF domain to be the same upon arrival at the receiver. In other embodiments, the receiver includes two photosensitive elements, each receiving from a receiver end WDM a single wavelength. In this case, the phase adjustment may be applied at the receiver in the optical or RF domain.
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Kuo Chien-Yu
Nilsson Alan C.
Piehler David
Zou Xingyu
Harmonic Lightwaves, Inc.
Klivans Norman R.
Negash Kinfe-Michael
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