Optical conversion relay amplification system

• US 6,337,754 B1
• Filed: 11/17/1998
• Issued: 01/08/2002
• Est. Priority Date: 11/20/1997
• Status: Expired due to Fees

• Current Assignee: Kokusai Electric Co., Ltd.
• Original Assignee: Kokusai Electric Co., Ltd.
• Inventors: Imajo, Yoshihiro
• Primary Examiner(s): Pascal, Leslie
• Assistant Examiner(s): Phan, Hanh
• Application Number:
  US09/192,539
• Time in Patent Office: 1,148 Days
• Field of Search: 359/174, 359/177, 359/179, 359/176, 359/172, 359/145, 455/9, 455/14, 455/20, 455/22, 455/23, 455/410
• US Class Current: 398/115
• CPC Class Codes: H04B 10/25752 Optical arrangements for wireless networks
• CPC Class Codes: H04B 10/25753 Distribution optical network, e.g. between a base station and a plurality of remote units

Abstract

The present invention provides an economic optical conversion relay amplification system avoiding a beat noise in an uplink line of an optical transmission line of multibranching and multinode multiplexing type.

In the optical conversion relay amplification system of the present invention, a downlink radio signal is converted to an optical signal in an electric/optical converter the fixed central station, and transmitted via a downlink optical fiber line, divided in a downlink optical signal in an optical branching device of a fixed relay station, subjected to optical multiplex, subjected to optical multiplexing with an uplink optical signal transmitted from a lower rank fixed relay station by an optical multiplexer, and converted to an electric signal by an optical—electric converter, a down link signal component is contained in the electric signal is sent to a portable apparatus via an antenna, the uplink signal component is subjected to power multiplexing with an uplink signal transmitted from the portable apparatus by a power multiplexer, converted to an optical signal by an electric—optical converter to transmit via an uplink optical fiber line, and again converted to an electric signal by the optical/electric converter of the fixed central station to send as an uplink radio signal.

Claims

1. An optical conversion relay amplification system having a fixed central station for transmission and receiving of a radio signal from a base station and a plurality of fixed relay stations located in intermediate position in an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station converting a radio signal arrived from said base station to an optical signal to output to said downlink optical fiber line, and also converting the optical signal inputted from said uplink optical fiber line to a high frequency electric signal to send to said base station, and

said fixed relay station is a fixed relay station dividing the downlink optical signal from said downlink optical fiber line, multiplexing with the divided downlink optical signal and an uplink optical signal from said uplink optical fiber line, converting the multiplexed optical signal to an electric signal, transmitting the downlink electric signal contained in said converted electric signal to portable phone by wireless system, and also receiving the radio signal from the said portable phone to multiplex with an uplink electric signal contained in said converted electric signal and converting the multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

2. An optical conversion relay amplification system having a fixed central station working for transmission/receiving of a signal to/from public networks, respectively, and a plurality of fixed relay station located in intermediate position in downlink optical fiber line from said fixed central station and an uplink optical fiber line toward said fixed central station, wherein

said fixed central station is a fixed central station modulating a signal received from said public network to make a high frequency signal to convert to an optical signal for output to said downlink optical fiber line, and also converting the optical signal inputted from said uplink optical fiber line to a high frequency electric signal, demodulate to transmit to said public network, and

said fixed relay station is a fixed relay station dividing the downlink optical signal from said downlink optical fiber line, multiplexing with the divided downlink optical signal and an uplink optical signal from said uplink optical fiber line, converting the multiplexed optical signal to an electric signal, transmitting downlink electric signal contained in the converted electric signals to a portable phone by radio, and also receiving a radio signal from said portable phone to multiplex with uplink electric signals contained in said converted electric signals, and converting the multiplexed electric signals to optical signals to output to said uplink optical fiber line.

3. An optical conversion relay amplification system having a fixed central station to receive a radio signal arrived from a base station and a plurality of fixed relay stations located in an intermediate position in downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station, wherein a radio signal received from said base station is converted to an optical signal to output to said downlink optical fiber line, and also an optical signal inputted from said uplink optical fiber line is converted to an electric signal to receive a surveillance signal of a surveillance result in said fixed relay station, and

said fixed relay station is a fixed relay station, wherein a downlink optical signal branches from said downlink optical fiber line, the branched downlink optical signal is multiplexed with an uplink optical signal from said uplink optical fiber line, the multiplexed optical signal is converted to an electric signal, a downlink electric signal contained in the converted electric signals is transmitted to a radio paging receiver by wireless system, an uplink electric signal contained in said converted electric signals is multiplexed with the surveillance signal, and the multiplexed electric signals are converted to optical signals with the surveillance signal, the multiplexed electric signals are converted to optical signals to output to said uplink optical fiber line to output to said uplink optical fiber line.

4. An optical conversion relay amplification system having a fixed central station to receive a signal from a public network and a plurality of fixed relay station located in intermediate position of a downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station, wherein a signal received from said public network is modulated to a high frequency signal, converted to an optical signal to output to said downlink optical fiber line, and also the optical signal inputted from said uplink optical fiber line is converted to an electric signal to receive a surveillance signal of a surveillance result in said fixed relay station, and

said fixed relay station is a fixed relay station, wherein a downlink optical signal branches from said downlink optical fiber line, the branched downlink optical signal is multiplexed with an uplink optical signal from said uplink optical fiber line, the multiplexed optical signal is converted to an electric signal, a downlink electric signal contained in the converted electric signals is transmitted to a paging receiver by wireless system, an uplink electric signal contained in said converted to optical signals with the surveillance signal, the multiplexed electric signals are converted to optical signals to output to said uplink optical fiber line to output to said uplink optical fiber line.

5. An optical conversion relay amplification system having a fixed central station to transmit/receive a radio signal to/from a base station and a plurality of fixed relay station located in intermediate position of a downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station, wherein a surveillance controlling signal controlling surveillance in said fixed relay station is multiplexed with a radio signal received from said base station, said multiplexed electric signal is converted to an optical signal to output to said downlink optical fiber line, and also an optical signal inputted from said uplink optical fiber line is converted to an electric signal, and said electric signal is separated into a signal to said base station and a surveillance signal of a surveillance result in said fixed relay station to transmit said signal to said base station, and also said surveillance signal is received, and

said fixed relay station is a fixed relay station, wherein a downlink optical signal branches from said downlink optical fiber line, the branched downlink optical signal is multiplexed with an uplink optical signal from said uplink optical fiber line, the multiplexed optical signal is converted to an electric signal, a downlink electric signal contained in the converted electric signals is separated into a signal for a portable phone and a surveillance controlling signal, the surveillance signal yielded by said surveillance, the radio signal received from said portable phone, and an uplink electric signal contained in said converted electric signal are multiplexed, and the multiplexed electric signals are converted to optical signals to output to said uplink optical fiber line.

6. An optical conversion relay amplification system having a fixed central station to transmit/receive a signal to/from a public network and a plurality of fixed relay station located in an intermediate position of respective downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station, wherein a surveillance controlling signal controlling surveillance in said fixed relay station is multiplexed with a high frequency signal generated by modulating a signal received from said public network, said multiplexed electric signal is modulated and converted to an optical signal to output to said downlink optical fiber line, and also an optical signal inputted from said uplink optical fiber line is converted to an electric signal, and said electric signal is separated into a signal for said public network and a surveillance signal of a surveillance result in said fixed relay station to transmit a signal for said public network to said public network after demodulation, and also said surveillance signal is received, and

said fixed relay station is a fixed relay station, wherein a downlink optical signal branches from said downlink optical fiber line, the branched downlink optical signal is multiplexed with an uplink optical signal from said uplink optical fiber line, the multiplexed optical signal is converted to an electric signal, a downlink electric signal contained in the converted electric signals is separated into a signal for a portable phone and a surveillance controlling signal, the separated signal for a portable phone is transmitted to a portable phone by wireless system, and also surveillance is carried out on the basis of said separated surveillance controlling signal, the separated signal for a portable phone is transmitted to a portable phone by wireless system, and also surveillance is carried out on the basis of said separated surveillance controlling signal, the surveillance signal yielded by said surveillance, the radio signal received from said portable phone, a surveillance signal outputted from said surveillance controlling signal unit, and an uplink electric signal contained in said converted electric signals are multiplexed, and the multiplexed electric signals are converted to optical signals to output to said uplink optical fiber line.

7. An optical conversion relay amplification system having a fixed central station to transmit/receive a radio signal to/from a base station and a plurality of fixed relay stations located in an intermediate position in downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having an antenna transmitting/receiving a radio signal to/from said base station, the first electric/optical converter converting a signal received with said antenna to an optical signal to output to said downlink optical fiber line, the first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to an electric signal to output to said antenna, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, the second optical/electric converter—

located in the upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, an uplink band pass filter for relay to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, antenna sending a downlink electric signal passed through said downlink band pass filter to a portable phone by wireless system and receiving a radio signal from said portable phone, a receiving uplink band pass filter to pass only a radio signal—

received by said antenna—

from said portable phone, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter with a radio signal passed through said receiving uplink band pass filter, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

8. An optical conversion relay amplification system according to claim 7, wherein a leaky coaxial cable is an antenna for the fixed relay station.

9. An optical conversion relay amplification system having a fixed central station to transmit/receive a signal to/from a public network and a plurality of fixed relay station located in an intermediate position of a downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having a high frequency modulator modulating a signal received from said public network to yield a high frequency signal, a first electric/optical converter converting signal said modulated electric signal to an optical signal to output to said downlink optical fiber line, first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to an electric signal, and a high frequency demodulator demodulating said converted high frequency electric signal to send to said public network, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, a second optical/electric converter—

located in upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, a relay uplink band pass filter to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, an antenna sending a downlink electric signal passed through said downlink band pass filter to a portable phone by wireless system and receiving a radio signal from said portable phone, a receiving uplink band pass filter to pass only radio signal—

received with said antenna—

from said portable phone, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter with a radio signal passed through said receiving uplink band pass filter, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

10. An optical conversion relay amplification system having a fixed central station to transmit/receive a radio signal to/from a base station and a plurality of fixed relay stations located in an intermediate position in downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having an antenna transmitting/receiving a radio signal to/from said base station, the first electric/optical converter converting a signal received with said antenna to an optical signal to output to said downlink optical fiber line, the first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to an electric signal, a surveillance signal demodulator demodulating said converted electric signal to receive a surveillance signal as a result of surveillance in said fixed relay station, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, the second optical/electric converter—

located in the upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, a relaying uplink band pass filter to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, an antenna sending a downlink electric signal passed through said downlink band pass filter to a radio paging receiver by wireless system, a first surveillance control unit monitoring respective parts of said fixed relay station to output a surveillance signal, a modulator for a surveillance signal to modulate said surveillance signal, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter with an electric signal modulated by said modulator for a surveillance signal, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

11. An optical conversion relay amplification system having a fixed central station to transmit/receive a signal to/from a public network and a plurality of fixed relay station located in an intermediate position of a downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having a high frequency modulator modulating a signal received from said public network to yield a high frequency signal, a first electric/optical converter converting said modulated electric signal to an optical signal to output to said downlink optical fiber line, first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to electric signal, and a demodulator for surveillance signal demodulating said converted electric signal to receive a surveillance signal as a result of surveillance in said fixed relay station, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, a second optical/electric converter—

located in upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, a relay uplink band pass filter to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, an antenna sending a downlink electric signal passed through said downlink band pass filter to a radio paging receiver by wireless system, a first surveillance control unit monitoring respective parts of said fixed relay station to output a surveillance signal, a modulator for a surveillance signal to modulate said surveillance signal, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter with an electric signal modulated by said modulator for surveillance signal, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

12. An optical conversion relay amplification system having a fixed central station to transmit/receive a radio signal to/from a base station and a plurality of fixed relay stations located in an intermediate position in downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having a modulator for surveillance control signal modulating a surveillance control signal to control surveillance in said fixed relay station, an antenna transmitting/receiving a radio signal to/from said base station, a second power multiplexer multiplexing a signal received with said antenna with said modulated surveillance control signal, a first electric/optical converter converting said multiplexed electric signal to an optical signal to output to said downlink optical fiber line, a first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to an electric signal, a second power distributor distributing an electric signal converted by said first optical/ electric converter, a transmitting uplink band pass filter to pass only a signal—

contained in electric signals distributed by said second power distributor—

for said base station to output to said antenna, a band pass filter for surveillance signal to pass only surveillance signal—

contained in electric signals distributed by said second power distributor—

as a result of surveillance in said fixed relay station, and a demodulator for surveillance signal demodulating a signal passed through said band pass filter for surveillance signal to receive a surveillance signal, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, a second optical/electric converter—

located in upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, a relay uplink band pass filter to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, a band pass filter for surveillance control signal to pass only a surveillance control signal contained in electric signals distributed by said first power distributor, an antenna sending a downlink electric signal passed through said downlink band pass filter to a portable phone by wireless system and receiving a radio signal from said portable phone, a demodulator for surveillance controlling signal to demodulate a signal from said band pass filter for surveillance control signal, a second surveillance controlling unit in which a surveillance control signal from said demodulator for surveillance control signal is inputted, respective parts of said fixed relay station are monitored, and the surveillance signal is outputted, a modulator modulating said surveillance signal, a receiving uplink band pass filter to pass only radio signal—

received with said antenna—

from said portable phone, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter a radio signal passed through said receiving uplink band pass filter, and an electric signal modulated by said modulator for surveillance signal, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.

13. An optical conversion relay amplification system having a fixed central station to transmit/receive a signal to/from a public network and a plurality of fixed relay station located in an intermediate position of a downlink optical fiber line from said fixed central station and an uplink optical fiber line to said fixed central station, wherein

said fixed central station is a fixed central station having a modulator for a surveillance control signal modulating a surveillance control signal to control surveillance in said fixed relay station, a high frequency modulator modulating a signal received from said public network to yield a high frequency signal, a second power multiplexer multiplexing an electric signal modulated by said modulator for a surveillance control signal with an electric signal modulated by said high frequency modulator, a first electric/optical converter converting said multiplexed electric signal to an optical signal to output to said downlink optical fiber line, first optical/electric converter converting an optical signal inputted from said uplink optical fiber line to an electric signal, and a second power distributor distributing an electric signal converted by said first optical/electric converter, a band pass filter for surveillance signal to pass only surveillance signal—

contained in electric signals distributed by said second power distributor—

as a result of surveillance in said fixed relay station, a demodulator for surveillance signal demodulating a signal passed through said band pass filter for surveillance signal to receive a surveillance signal, a transmitting uplink band pass filter to pass only a signal—

contained in electric signals distributed by said second power distributor—

for said public network, a high frequency demodulator demodulating a signal passed through said transmitting uplink band pass filter to output to said public network, and

said fixed relay station is a fixed relay station having an optical branching device in which an optical signal branches from said downlink optical fiber line, an optical multiplexer multiplexing an optical signal branched in said optical branching device with said uplink optical fiber line, a second optical/electric converter—

located in upstream of an uplink optical fiber line to which said optical multiplexer fitted—

converting an optical signal to an electric signal, a first power distributor distributing said converted electric signal, a relay uplink band pass filter to pass only an uplink electric signal contained in electric signals distributed by said first power distributor, a downlink band pass filter to pass only a downlink electric signal contained in electric signals distributed by said first power distributor, a band pass filter for surveillance control signal to pass only a surveillance control signal contained in electric signals distributed by said first power distributor, an antenna sending a downlink electric signal passed through said downlink band pass filter to a portable phone by wireless system and receiving a radio signal from said portable phone, a second demodulator demodulating a signal passed through said band pass filter for surveillance control signal, a second surveillance controlling unit in which a surveillance control signal second demodulator is inputted, respective parts of said fixed relay station are monitored, and the surveillance signal is outputted, a modulator—

for said surveillance control signal—

modulating said surveillance signal, a receiving uplink band pass filter to pass only radio signal—

received with said antenna—

from said portable phone, a first power multiplexer multiplexing an uplink electric signal passed through said relaying uplink band pass filter, a radio signal passed through said receiving uplink band pass filter, and an electric signal modulated by said modulator for surveillance signal, and a second electric/optical converter converting said multiplexed electric signal to an optical signal to output to said uplink optical fiber line.