Apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery
First Claim
1. An apparatus for simultaneous demultiplexing and optical pulse generation, compnsing:
- a traveling-wave electroabsorption modulator (TW-EAM) including a first port, a second port for producing a photocurrent, a third port, and a fourth port, the TW-EAM receiving optical time-division multiplexing (OTDM) data of a first bit rate with a first wavelength and a continuous wave optical signal with a second wavelength; and
a phase-locked loop (PLL) including an input and an output, the input being connected to the second port of the TW-EAM, the output being connected to the fourth port,wherein the photocurrent includes a tone of a fundamental frequency determined by the first bit rate that is applied to the PLL to recover an electrical clock with a first frequency, the first frequency being determined by dividing the fundamental frequency by N, where N is a natural number larger than 1, andwherein the recovered electrical clock is supplied to the fourth port of the TW-EAM to modulate the TW-EAM and to generate demultiplexed data of a second bit rate with the first wavelength and an optical pulse with the first frequency and the second wavelength.
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Abstract
An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.
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Citations
11 Claims
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1. An apparatus for simultaneous demultiplexing and optical pulse generation, compnsing:
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a traveling-wave electroabsorption modulator (TW-EAM) including a first port, a second port for producing a photocurrent, a third port, and a fourth port, the TW-EAM receiving optical time-division multiplexing (OTDM) data of a first bit rate with a first wavelength and a continuous wave optical signal with a second wavelength; and a phase-locked loop (PLL) including an input and an output, the input being connected to the second port of the TW-EAM, the output being connected to the fourth port, wherein the photocurrent includes a tone of a fundamental frequency determined by the first bit rate that is applied to the PLL to recover an electrical clock with a first frequency, the first frequency being determined by dividing the fundamental frequency by N, where N is a natural number larger than 1, and wherein the recovered electrical clock is supplied to the fourth port of the TW-EAM to modulate the TW-EAM and to generate demultiplexed data of a second bit rate with the first wavelength and an optical pulse with the first frequency and the second wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for simultaneous demultiplexing and optical pulse generation, comprising:
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a traveling-wave electroabsorption modulator (TW-EAM) including a first port for receiving optical time-division multiplexing (OTDM) data of a first bit rate with a first wavelength and a continuous wave optical signal with a second wavelength, a second port for producing a photocurrent, a third port, and a fourth port; and a phase-locked loop (PLL) including an input and an output, the input being connected to the second port of the TW-EAM, the output being connected to the fourth port, wherein the photocurrent includes a tone of a fundamental frequency determined by the first bit rate that is applied to the PLL to recover an electrical clock with a first frequency, the first frequency being determined by dividing the fundamental frequency by N, where N is a natural number larger than 1, and wherein the recovered electrical clock is supplied to the fourth port of the TW-EAM to modulate the TW-EAM and generate, at the third port, demultiplexed data of a second bit rate with the first wavelength and an optical pulse with the first frequency and the second wavelength, respectively.
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Specification