In-situ power monitor providing an extended range for...

Details In-situ power monitor providing an extended range for... In-situ power monitor providing an extended range for...

2005-09-09

2009-02-24

Yam, Stephen (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C398S202000, C250S2140AG, C250S2140LS

Reexamination Certificate

active

07495203

ABSTRACT:
Disclosed are an in-line monitoring apparatus, an optical receiver and a method for monitoring an input power of an optical signal in which one or more power monitoring stages, for example can measure the input power over an extended input power range. In one embodiment, an apparatus includes an avalanche photodiode (“APD”) configured to receive the optical signal and an input configured to bias the APD. It also includes one or more power monitoring stages coupled to the input in parallel with the APD for generating one or more measurement signals in-situ. In one embodiment, a range selector selects which one of the one or more power monitoring stages is to provide a measurement signal indicative of the input optical power. The power monitoring stages can provide for a wide range of linear current measurements as well as a range of measurable currents to monitor low-powered optical signals.

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Maxim, 76V, “High-Side, Current-Sense Amplifiers with Voltage Output,”MAX4080/MAX4081, 19-2562, Rev 0, Oct. 2002, pp. 1-15.
Analog Devices, “Avalanche Photodiode Bias Controller and Wide-Range (5 nA—5 mA) Current Monitor,” ©Analog Devices, Inc., 2005, pp. 1-11.

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