US5548434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial light transmission apparatus
Assignee: Sharp Corp
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Filing: 1994-11-30
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Granted: 1996-08-20
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Expires: 2014-11-30
Abstract
Abstract A spatial coherent light transmission apparatus according to the present invention, includes: a light transmitter for emitting a data signal as first coherent light; a light receiver for emitting second coherent light having a wavelength little different from that of The first coherent light, mixing and receiving the first and second coherent lights, and performing a coherent detection of the data signal. At least one of the light transmitter and the light receiver has a detection device for detecting at least one of a coherent light transmission state and a coherent light detection state. The apparatus further includes a control device for controlling at least one of the light transmitter and the light receiver based on information of the state detected by the detection device.
Inventors
- 👤 Atsushi Shimonaka
- 👤 Mototaka Taneya
- 👤 Hidenori Kawanishi
- 👤 Tatsuya Morioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:54
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/112; H04B10/1123; H04B10/1125
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
124 words
A spatial coherent light transmitting apparatus comprising: a first device for emitting a data signal as first coherent light; a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent lights, and performing a coherent detection of the data signal, each of the first device and the second device having a detection means for detecting at least one of a coherent light transmission state and a coherent light detection state; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 2
Dependent Claim
124 words
A spatial coherent light transmitting apparatus comprising: a first device for emitting a data signal as first coherent light; a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent lights, and performing a coherent detection of the data signal, each of the first device and the second device having a detection means for detecting at least one of a coherent light transmission state and a coherent light detection state; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 3
Dependent Claim
77 words
A spatial coherent light transmission apparatus according to claim 1, wherein the control means includes: a control signal transmission section for transmitting a control signal intensity-modulated in accordance with the information of the state detected by the detection means; a control signal light receiving section for receiving the control signal; and a control section for controlling transmission of the data signal by performing a direct detection of a photocurrent received by the control signal light receiving section.
Claim 4
Dependent Claim
40 words
A spatial coherent light transmission apparatus according to claim 1, wherein at least one of a beat signal intensity, a beat signal frequency and a noise current intensity is detected by the detection means as the coherent light detection state.
Claim 5
Dependent Claim
29 words
A spatial coherent light transmission apparatus according to claim 1, wherein a temperature and an oscillation frequency is detected by the detection means as the coherent light transmission state.
Claim 6
Dependent Claim
100 words
A spatial coherent light transmission apparatus according to claim 2, comprising: a receiving section providing a means for receiving the first and second coherent lights, the means serving also as a control signal light receiving section for receiving the control signal; a filter section for separating a signal received by the receiving section into the control signal and a beat signal; a control signal detection section for performing a direct detection of the control signal separated by the filter section; and a beat signal detection section for performing the coherent detection of the beat signal separated by the filter section.
Claim 7
Dependent Claim
107 words
A spatial coherent light transmission apparatus according to claim 1, wherein the second device includes: a light receiving means for receiving and converting the mixed first and second coherent lights into an electric signal; a control signal outputting means for outputting a control signal in accordance with a value of the electric signal in accordance with a value of the electric signal converted by the light receiving means; a direct detection means for performing a direct detection by using the electric signal; and a switching means for switching the direct detection performed by the direct detection means and the coherent detection, in response to the control signal.
Claim 8
Dependent Claim
55 words
A spatial coherent light transmission apparatus according to claim 6, wherein the second device includes: a locally oscillated beam generating means for generating a locally oscillated beam for the coherent detection; and an oscillation frequency switching means for switching an oscillation frequency of the locally oscillated beam generating means in response to the control signal.
Claim 9
Dependent Claim
76 words
A spatial coherent light transmission apparatus according to claim 6, wherein the second device includes a transmitting means for transmitting a control data signal to the first device in response to the control signal; and the first device includes a signal receiving means for receiving the control data signal transmitted from the transmitting means and a modifying means for modifying a modulation method in response to the control data signal received by the signal receiving means.
Claim 10
Dependent Claim
76 words
A spatial coherent light transmission apparatus according to claim 6, wherein the second device includes: a light amount adjustment means for adjusting a light amount input to the light receiving means; a maximum value detection means for detecting a maximum value of the beat signal supplied from the light receiving means; and a light amount control means for controlling the light amount adjustment means in response to an output signal from the maximum value detection means.
Claim 11
Dependent Claim
130 words
A spatial coherent light transmission apparatus according to claim 6, wherein the second device includes: another light receiving means disposed adjacent to the light receiving means; a phase difference detection means for detecting a phase difference between a signal from the light receiving means and a signal from the another light receiving means; a phase inversion means, connected to one of the light receiving means and the another light receiving means, for inverting a phase of the signal from the connected light receiver means in response to an output signal of the phase difference detection means; and an addition means for adding the signal having its phase inverted by the phase inversion means and the signal of the other of the light receiving means and the another light receiving means.
Claim 12
Dependent Claim
28 words
A spatial coherent light transmission apparatus according to claim 6, further comprising a collecting means for collecting incident light, disposed on a front face of the second device.
Claim 13
Dependent Claim
28 words
A spatial coherent light transmission apparatus according to claim 6, further comprising an aperture means for limiting incident light, disposed on a front face of the second device.
Claim 14
Dependent Claim
109 words
A spatial coherent light transmission apparatus comprising: a first device for emitting a data signal as first coherent light; and a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent light, and performing a coherent detection of the data signal, the second device including a detection means for detecting a coherent light detection state; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 15
Dependent Claim
109 words
A spatial coherent light transmission apparatus comprising: a first device for emitting a data signal as first coherent light; and a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent light, and performing a coherent detection of the data signal, the second device including a detection means for detecting a coherent light detection state; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 16
Dependent Claim
92 words
A spatial coherent light transmission apparatus according to claim 13, wherein the control means includes: a control signal transmission section, disposed in the second device, for transmitting a control signal intensity-modulated in accordance with the information of the state detected by the detection means; a control signal light receiving section, disposed in the first device, for receiving the control signal; and a control section disposed in the first device, for controlling transmission of the data signal by performing a direct detection of a photocurrent received by the control signal light receiving section.
Claim 17
Dependent Claim
52 words
A spatial coherent light transmission apparatus according to claim 14, wherein the control means further includes a wavelength tuning section, disposed in the second device, for controlling a wavelength of the second coherent light so as to attain a wavelength tuning based on information of the state detected by the detection means.
Claim 18
Dependent Claim
40 words
A spatial coherent light transmission apparatus according to claim 13, wherein at least one of a beat signal intensity, a beat signal frequency and a noise current intensity is detected by the detection means as the coherent light detection state.
Claim 19
Dependent Claim
87 words
A spatial coherent light transmission apparatus according to claim 14, wherein one unit serves as the first device for emitting a light signal as the first coherent light, as a means for generating the second coherent light, and as the control signal transmission section for transmitting the control signal, and another unit serves as a means for receiving the first and second coherent lights and as a control signal light receiving section for receiving the control signal, whereby the first device serves also as the second device.
Claim 20
Dependent Claim
99 words
A spatial coherent light transmission apparatus according to claim 14, comprising: a receiver section serving both as a means for receiving the first and second coherent lights and as a control signal light receiving section for receiving the control signal; a filter section for separating a signal received by the receiver section into the control signal and a beat signal; a control signal detection section for performing a direct detection of the control signal separated by the filter section; and a beat signal detection section for performing the coherent detection of the beat signal separated by the filter section.
Claim 21
Dependent Claim
98 words
A spatial coherent light transmission apparatus according to claim 13, wherein the second device includes: a light receiving means for receiving and converting the mixed first and second coherent lights into an electric signal; a control signal outputting means for outputting a control signal in accordance with a value of the electric signal converted by the light receiving means; a direct detection means for performing a direct detection by using the electric signal; and a switching means for switching the direct detection performed by the direct detection means and the coherent detection, in response to the control signal.
Claim 22
Dependent Claim
55 words
A spatial coherent light transmission apparatus according to claim 13, wherein the second device includes: a locally oscillated beam generating means for generating a locally oscillated beam for the coherent detection; and an oscillation frequency switching means for switching an oscillation frequency of the locally oscillated beam generating means in response to the control signal.
Claim 23
Dependent Claim
74 words
A spatial coherent light transmission apparatus according to claim 13, wherein the second device includes a transmitting means for transmitting a control data signal to the first device in response to the control signal, and the first device includes a receiving means for receiving the control data signal transmitted from the transmitting means and a modifying means for modifying a modulation method in response to the control data signal received by the receiving means.
Claim 24
Dependent Claim
76 words
A spatial coherent light transmission apparatus according to claim 13, wherein the second device includes: a light amount adjustment means for adjusting a light amount input to the light receiving means; a maximum value detection means for detecting a maximum value of the beat signal supplied from the light receiving means; and a light amount control means for controlling the light amount adjustment means in response to an output signal from the maximum value detection means.
Claim 25
Dependent Claim
130 words
A spatial coherent light transmission apparatus according to claim 19, wherein the second device includes: another light receiving means disposed adjacent to the light receiving means; a phase difference detection means for detecting a phase difference between a signal from the light receiving means and a signal from the another light receiving means; a phase inversion means, connected to one of the light receiving means and the another light receiving means, for inverting a phase of the signal from the connected light receiving means in response to an output signal of the phase difference detection means; and an addition means for adding the signal having its phase inverted by the phase inversion means and the signal of the other of the light receiving means and the another light receiving means.
Claim 26
Dependent Claim
28 words
A spatial coherent light transmission apparatus according to claim 19, further comprising a collecting means for collecting incident light, disposed on a front face of the second device.
Claim 27
Dependent Claim
28 words
A spatial coherent light transmission apparatus according to claim 19, further comprising an aperture means for limiting incident light, disposed on a front face of the second device.
Claim 28
Dependent Claim
108 words
A spatial coherent light transmission apparatus comprising: a first device for emitting a data signal as first coherent light, the first device including a detection means for detecting a coherent light transmission state; a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent light, and performing a coherent detection of the data signal; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 29
Dependent Claim
108 words
A spatial coherent light transmission apparatus comprising: a first device for emitting a data signal as first coherent light, the first device including a detection means for detecting a coherent light transmission state; a second device for receiving the first coherent light and for producing second coherent light having a wavelength little different from that of the first coherent light, said second device mixing the first and second coherent light, and performing a coherent detection of the data signal; and a control means for controlling at least one of the first device and the second device in response to information of the state detected by the detection means.
Claim 30
Dependent Claim
162 words
A spatial coherent light transmission apparatus according to claim 26, wherein: the first device includes a first detection section for detecting a coherent light transmission state, and a signal transmission section for transmitting a control signal of information of the state detected by the first detection section as a light signal obtained by intensity-modulating the data signal; the second device includes a signal receiving section for receiving the light signal, a second detection section for detecting a coherent light transmission state and a coherent light detection state from the control signal and the data signal of the light signal received by the signal receiving section, and a wavelength tuning section for controlling a wavelength of the second coherent light based on information of the state detected by the second detection section so as to attain a wavelength tuning; the detection means includes the first and second detection sections; and the control means includes the signal transmission section and the wavelength tuning section.
Claim 31
Dependent Claim
40 words
A spatial coherent light transmission apparatus according to claim 27, wherein at least one of a beat signal intensity, a beat signal frequency and a noise current intensity is detected by the detection means as the coherent light detection state.
Claim 32
Dependent Claim
29 words
A spatial coherent light transmission apparatus according to claim 27, wherein a temperature and an oscillation frequency is detected by the detection means as the coherent light transmission state.
Claim 33
Dependent Claim
87 words
A spatial coherent light transmission apparatus according to claim 27, wherein one unit serves as the first device for emitting a light signal as the first coherent light, as a means for generating the second coherent light, and as the control signal transmission section for transmitting the control signal, and another unit serves as a means for receiving the first and second coherent lights and as a control signal light receiving section for receiving the control signal, whereby the first device serves also as the second device.
Claim 34
Dependent Claim
100 words
A spatial coherent light transmission apparatus according to claim 27, comprising: a receiving section including a means for receiving the first and second coherent lights, the means serving also as a control signal light receiving section for receiving the control signal; a filter section for separating the signal received by the receiving section into the control signal and a beat signal; a control signal detection section for performing a direct detection of the control signal separated by the filter section; and a beat signal detection section for performing the coherent detection of the beat signal separated by the filter section.
Claim 35
Dependent Claim
84 words
A spatial coherent light transmission apparatus according to claim 27, wherein the second device further includes a control signal transmission section for transmitting a second control signal intensity-modulated in accordance with information of the state detected by the detection means; and the first device includes a control signal light receiving section for receiving the second control signal, and a control section for controlling transmission of the data signal by performing a direct detection of a photocurrent received by the control signal light receiving section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |