Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2005-08-23
2005-08-23
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Accessories
Attenuator
C398S189000, C359S264000, C385S147000
Reexamination Certificate
active
06934458
ABSTRACT:
A method of generating a pulse width modulated (PWM) signal receives digital demand data comprising at least one more significant bit and at least one less significant bit. The PWM signal comprises a sequence of one or more frames, each frame comprising a plurality of PWM pulses whose duty cycle is substantially governed by the at least one more significant bit. At least one of its PWM pulses is selected to have its duty cycle modified in response to the at least one less significant bit. Each of the at least one less significant bit uniquely mapping onto the at least one selected PWM pulse of the frame. An apparatus operable according to this method includes an optical attenuator whose optical attenuation is dependent upon its temperature and in which the temperature and, hence, the attenuation is controlled using the above PWM signal.
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Brown Roger W
Butler Graham
Dennis Earl A
Leach Michael J
Vass Darren W
Kirschstein et al.
Marconi UK International Property Ltd.
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