WDM hybrid splitter module

• US 20080031625A1
• Filed: 07/26/2007
• Published: 02/07/2008
• Est. Priority Date: 07/28/2006
• Status: Abandoned Application

• Current Assignee: Santec Incorporated
• Original Assignee: Santec Incorporated
• Inventors: Uehara, Noboru, Mekada, Naoyuki, Miyakoshi, Taihei, Okuda, Ryousuke
• Application Number:
  US11/878,802
• Publication Number:
  US 20080031625A1
• Time in Patent Office: Days
• US Class Current: 398/71
• CPC Class Codes: G02B 2006/12109 Filter
• CPC Class Codes: G02B 6/12007 forming wavelength selective elements, e.g. multiplexer, demultiplexer
• CPC Class Codes: G02B 6/29361 Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
• CPC Class Codes: G02B 6/29362 Serial cascade of filters or filtering operations, e.g. for a large number of channels
• CPC Class Codes: G02B 6/29365 in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
• CPC Class Codes: G02B 6/29367 Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
• CPC Class Codes: G02B 6/2937 In line lens-filtering-lens devices, i.e. elements arranged along a line and mountable in a cylindrical package for compactness, e.g. 3- port device with GRIN lenses sandwiching a single filter operating at normal incidence in a tubular package
• CPC Class Codes: G02B 6/2938 for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems

Abstract

A downlink signal and WDM-PON signal from an OLT 1 are separated by an optical filter part 11, and a downlink signal is split by a power splitter part 12. A WDM-PON signal is also split in each wavelength by a demultiplexer part 13, and a downlink signal and a WDM-PON signal of either one of the wavelengths are outputted to each ONU, in an optical filter part 14. Moreover, an uplink signal from the ONU is introduced to the power splitter part 12 via the optical filter part 14, and outputted to the OLT 1 via the optical filter part 11. Therefore, it is possible to realize a hybrid splitter module which allows upgrading a downlink signal to a WDM-PON without adding changes to a device on a subscriber side.

Claims

1. A WDM hybrid splitter module in an optical communication system connected between a station-side transceiver for transmitting and receiving an optical signal of a PON signal bandwidth and for transmitting an optical signal of a WDM-PON wavelength bandwidth configured with a plurality of wavelength bandwidths, and a user-end transceiver, comprising:

a first filter part connected to said station-side transceiver for separating a PON signal wavelength band from a WDM-PON signal wavelength band;

a splitter part for splitting an optical signal of a PON signal wavelength band separated by said first optical filter part into 1;

n, and for coupling optical signals of an uplink PON signal wavelength band obtained from the user-end transceiver;

a demultiplexer part for splitting said WDM-PON signal wavelength band separated by said first optical filter part into each channel in accordance with a wavelength; and

a second optical filter part composed of a group of filters for coupling signals of the PON signal wavelength band split by said splitter part and either one of the WDM-PON signal wavelength bands separated by said demultiplexer part and outputting it to the user-end transceiver, and for outputting a signal of an uplink PON signal wavelength band outputted from the user-end transceiver to said splitter part.

2. The WDM hybrid splitter module according to claim 1, wherein

said first optical filter part includes filters composed of dielectric multilayered films.

3. The WDM hybrid splitter module according to claim 1, wherein

said second optical filter part includes filters composed of dielectric multilayered films.

4. The WDM hybrid splitter module according to claim 1, wherein

said demultiplexer part includes filters composed of dielectric multilayered films.

5. The WDM hybrid splitter module according to claim 1, wherein

said demultiplexer part and second optical filter part are configured by including a plurality of WDM modules integrated with one input, one output, and two input-outputs provided for each wavelength band of a WDM-PON signal.

6. The WDM hybrid splitter module according to claim 1, wherein

said demultiplexer part is composed of an array waveguide grating element.

7. The WDM hybrid splitter module according to claim 1, wherein

an integrated composite WDM module with one input and 2n input-outputs (n is a natural number) constitutes said demultiplexer part and second optical filter part.

8. The WDM hybrid splitter module according to claim 1, wherein

said WDM-PON signal wavelength band is in a bandwidth of larger than or equal to 1200 nm on a short wavelength side thereof and smaller than or equal to 1700 nm on a long wavelength side.

9. The WDM hybrid splitter module according to claim 1, wherein

said WDM hybrid splitter module is adapted to transmission systems for a G-PON (Gigabit-Passive Optical Network), B-PON (Broadband-Passive Optical Network), GE-PON (Gigabit Ethernet-Passive Optical Network), and E-PON (Ethernet-Passive Optical Network).