Optical receiver implemented with semiconductor amplifier
AssigneeSumitomo Electric Industries, Ltd.
InventorHirotaka Oomori
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Abstract
An optical receiver able to distinguish a failure occurred in one of multiplexed signals from a failure in the transmission medium is disclosed. The optical receiver includes an optical de-multiplexer, optical devices, a signal processor, and a controller. Each of the optical devices converts the de-multiplexed signal into an electrical signal. A clock is extracted from one of the electrical signals. The processor decides, based on the electrical signals and the clock, one of the multiplexed signals falls in a failure.
Claims8
An optical receiver to receive an optical signal multiplexing a plurality of signals each having a specific wavelength different from others, comprising:
- an optical de-multiplexer to de-multiplex the optical signal into a plurality of de-multiplexed signals;
- a plurality of optical devices each converting the de-multiplexed signal into an electrical signal;
- a signal processor for extracting a clock contained in one of electrical signals output from the optical device;
- and
- a controller configured to decide a failure occurred in at least one of signals by receiving the clock extracted by the signal processor and the electrical signals each output from the optical devices,
- wherein the controller includes a temporary register, a first arithmetical unit, and a first comparator, the temporary register storing the electrical signals in a magnitude thereof, the first arithmetical unit calculating time variations of the electrical signals that are compared with a first reference by a first comparator.
A method to control an optical receiver that receives an optical signal multiplexing a plurality of signals, the optical receiver including an optical de-multiplexer to de-multiplex the optical signal into the signals each having a wavelength specific thereto and difference from others, a plurality of optical devices each converting the signal into an electrical signal, the method comprising steps of:
- extracting a clock contained in optical signal from at least one of electrical signals;
- calculating time variations of electrical signals;
- calculating differences between time variations;
- and
- asserting an alarm when at least one of differences exceeds a reference.
Dependencies are inferred from the claim text.