Optical network for bi-directional wireless communication

• US 20070174889A1
• Filed: 12/28/2006
• Published: 07/26/2007
• Est. Priority Date: 01/26/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Hwang, Seong-Taek, Oh, Yun-Je, Kim, Yong-Gyoo
• Application Number:
  US11/646,737
• Publication Number:
  US 20070174889A1
• Time in Patent Office: Days
• US Class Current: 725/129
• CPC Class Codes: H04N 21/4886 for displaying a ticker, e.g. scrolling banner for news, stock exchange, weather data
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 21/812 involving advertisement data advertising per se G06Q30/02
• CPC Class Codes: H04N 21/8451 using Advanced Video Coding [AVC]
• CPC Class Codes: H04N 7/17318 Direct or substantially direct transmission and handling of requests

Abstract

An optical network is provided. The optical network includes a station to convert a downstream radio frequency (RF) signal to a downstream optical signal and convert an upstream optical signal to an upstream RF signal; and a remote access unit (RAU) to convert the downstream optical signal to a downstream RF signal and to convert the upstream RF signal to the upstream optical signal, wherein the RAU determines a non-transmission band portion on which data is not carried from the downstream RF signal and inputs upstream data in the non-transmission band.

Claims

1. An optical network for bi-directional wireless communication comprising:

a station to convert a downstream radio frequency (RF) signal to a downstream optical signal and convert an upstream optical signal to an upstream RF signal; and

a remote access unit (RAU) to convert the downstream optical signal to a downstream RF signal and to convert the upstream RF signal to the upstream optical signal, wherein the RAU determines a non-transmission band portion on which data is not carried from the downstream RF signal and inputs upstream data in the non-transmission band.

2. The optical network of claim 1, wherein the RF signal includes a downstream channel and timeslot and the upstream RF signal includes an upstream channel and timeslot.

3. The optical network of claim 2, wherein the RAU determines the non-transmission band portion on which data is not carried from the downstream timeslot and inputs the upstream timeslot in the non-transmission band.

4. The optical network of claim 1, wherein the station comprises:

a downstream electro-optic converter to convert the downstream RF signal to the downstream optical signal; and

an upstream opto-electric converter to convert the upstream optical signal to the upstream RF signal.

5. The optical network of claim 1, wherein the RAU comprises:

a downstream opto-electric converter to convert the downstream optical signal to the downstream RF signal;

an upstream electro-optic converter to convert the upstream RF signal to the upstream optical signal;

an antenna to transmit the downstream RF signal and receive the upstream RF signal;

a first coupler to separate the downstream RF signal converted by the downstream opto-electric converter into a downstream timeslot, a downstream broadcasting channel, and a downstream sub-carrier channel;

a second coupler to separate the upstream RF signal into an upstream timeslot, an upstream broadcasting channel, and an upstream sub-carrier channel;

a splitter to split a portion of the downstream timeslot separated by the first coupler;

a switch to alternatively input and output the upstream and downstream timeslots; and

a controller to control the switch to input and output the upstream and downstream timeslots by determining a non-transmission band on which data is not carried from the downstream timeslot split by the splitter.

6. The optical network of claim 3, wherein the RAU further comprises:

a first amplifier located between the downstream opto-electric converter and the first coupler, wherein the first amplifier amplifies the downstream RF signal, and outputs the amplified downstream RF signal to the first coupler;

a second amplifier to amplify the upstream RF signal and output the amplified upstream RF signal to the upstream electro-optic converter; and

a third coupler to output the downstream sub-carrier channel input from the first coupler to the second coupler and output the upstream sub-carrier channel input from the second coupler to the second amplifier.

7. The optical network of claim 3, wherein the controller comprises:

a pulse detector to detect an envelope pattern waveform from the downstream timeslot;

a band pass filter (BPF) to cancel noise from the timeslot waveform detected by the pulse detector;

a limiting amplifier to limit the level of the timeslot input from the BPF;

a reference voltage generator to generate a reference voltage having a pre-set level;

a comparator to detect a non-transmission band by comparing the reference voltage level of the reference voltage generator to the level of the timeslot input from the limiting amplifier; and

a delay adjuster to control the switch so that the upstream timeslot can pass the switch in the non-transmission band determined by the comparator.