Optical modulating device, optical transmitting apparatus using the same, method of controlling optical modulating device, and control program recording medium
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 11, 2007
Grant Date -
Nov 13, 2003
app pub date -
Apr 3, 2003
filing date -
Apr 5, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical modulating device including a driving circuit generating a driving voltage corresponding to an input signal, an oscillator generating a signal having a low frequency signal lower than that of the input signal, an MZ modulator receiving a DC bias voltage superposed with the low frequency signal and the driving voltage, to generate a modulated optical signal according to the input signal, a photoelectric converting unit for converting the modulated optical signal into an electric signal, a low frequency signal detecting circuit which extracts the low frequency signal component contained in the electric signal, multiplies the low frequency signal component by the low frequency signal outputted by the low frequency oscillator, and then extracts a DC component from a multiplied output signal, and a control circuit for extracting a maximized DC component from the low frequency signal detecting circuit by controlling the DC bias voltage.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully