Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2000-07-29
2002-07-02
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S024000, C385S033000, C359S199200, C359S199200
Reexamination Certificate
active
06415080
ABSTRACT:
TECHNICAL FIELD
The present invention is directed toward optical communications, and more particularly toward a bulk optical echelle grating multiplexer/demultiplexer.
BACKGROUND ART
At the inception of fiber optic communications, typically a fiber was used to carry a single channel of data at a single wavelength. Dense wavelength division multiplexing (DWDM) enables multiple channels at distinct wavelengths within a given wavelength band to be sent over a single mode fiber, thus greatly expanding the volume of data that can be transmitted per optical fiber. The wavelength of each channel is selected so that the channels do not interfere with each other and the transmission losses to the fiber are minimized. Typical DWDM allows up to 40 channels to be simultaneously transmitted by a fiber.
The volume of data being transmitted by optical fibers is growing exponentially and the capacity for data transmission is rapidly being consumed. Burying additional fibers is not cost effective. Increasing the optical transmission rate is limited by the speed and economy of electronics surrounding the system as well as chromatic dispersion in the fibers. Thus, the most promising solution for increasing data carrying capacity is increasing the number of channels per a given bandwidth through DWDM.
DWDM requires two conceptually symmetric devices: a multiplexer and a demultiplexer. A multiplexer takes multiple beams or channels of light, each at a discrete wavelength and from a discrete source and combines the channels into a single multi-channel or polychromatic beam. The input typically is a linear array of waveguides such as a linear array of optical fibers, a linear array of laser diodes or some other optical source. The output is typically a single waveguide such as an optical fiber. A demultiplexer spacially separates a polychromatic beam into separate channels according to wavelength. Input is typically a single input fiber and the output is typically a linear array of waveguides such as optical fibers or a linear array of photodetectors.
In order to meet the requirements of DWDM, multiplexers and demultiplexers require certain inherent features. First, they must be able to provide for a high angular dispersion of closely spaced channels so that individual channels can be separated over relatively short distances sufficiently to couple with a linear array of outputs such as output fibers. Furthermore, the multiplexer/demultiplexer must be able to accommodate channels over a free spectral range commensurate with fiber optic communications bandwidth. Moreover, the devices must provide high resolution to minimize cross talk and must further be highly efficient to minimize signal loss. The ideal device would also be small, durable, thermally stable, inexpensive and scalable.
Much of the attention in DWDM devices has been directed to array waveguides. Array waveguides have a set of intermediate pathways, e.g., waveguides, that progressively vary in length to incline wavefronts of different wavelength signals within a free spectral range. Confocal couplers connect the common and individual pathways to opposite ends of the intermediate pathways. One illustrative example is disclosed in Lee, U.S. Pat. No. 5,706,377. Array waveguides suffer from the disadvantages of being expensive to design and manufacture, unable to provide high channel densities over broad wavelengths necessary for DWDM, thermal sensitivity and a lack of scalability and polarization dependent and high insertion losses.
Another family of DWDM devices use a network of filters and/or fiber Bragg gratings for channel separation. Pan, U.S. Pat. No. 5,748,350, is illustrative. However, the channel spacing of these devices, on the order of 0.8 or 1.6 nanometers (nm), limits the number of wavelengths that can be coupled into or out of a fibers. Further, these devices present significant issues of optical loss, cross talk, alignment difficulties and thermal sensitivity.
Various bulk optical DWDM devices have also been investigated in the prior art. Fu et al., U.S. Pat. No. 5,970,190, teaches a grating-in-etalon wavelength division multiplexing device using a Bragg diffraction grating. Fu requires either a tilt mechanism or fabrication of an etalon waveguide with reflective exposed faces having a Bragg grating written into the waveguide. This device has limited channel separation capacity and requires a tilt mechanism that can be difficult to control and is unreliable.
Dueck, U.S. Pat. No. 6,011,884, teaches a DWM device with a collimating optic and bulk grating in near-littrow configuration. Dueck is concerned with the use of a homogeneous boot lens to create a one-piece integrated device. This device is intended to be compact, robust and environmentally and thermally stable. However, the device taught by Dueck fails to address the need to provide many channels for DWDM, high efficiency and a short focal length to provide a compact device.
Lundgren, U.S. Pat. No. 6,018,603, like Dueck, teaches the use of a bulk diffraction grating for DWM. Specially, Lundgren teaches the use of an echellette grating in combination with a rod-like graded refractive index lens or imaging lens for correcting any offset in the focal length of a focusing lens. Lundgren also fails to teach a DWDM device capable of accommodating high channel density and providing a high angular dispersion of channels so as to minimize focal length and apparatus size.
Other examples of techniques for multiplexing and demultiplexing optical signals include the use of birefringement element, the use of optical band pass filters, the use of interference filters, the use of prisms and the use of sequences of cascaded gratings. However, none of these systems provide the combination of beneficial attributes necessary to meet the growing needs for DWDM.
The present invention is intended to overcome some of the problems discussed above and to provide a bulk optical echelle grating multiplexer/demultiplexer with many of the attributes necessary for cost-effective DWDM.
SUMMARY OF THE INVENTION
A first aspect of the present invention is a dense wavelength multiplexer/demultiplexer (“DWDM”) for use in optical communication systems. The DWDM includes a multiplex optical waveguide propagating a plurality of optical channels of a channel spacing of 0.4 nm or less multiplexed as a single optical signal within a select near infrared wavelength range. A collimating/focusing optic is optically coupled to the multiplex optical waveguide at a select focal length. A reflective echelle grating is optically coupled to the collimating/focusing optic. The echelle grating has a groove spacing and blaze angle providing a select channel spacing of the multiplexed optical signal at the select focal length for a select order of diffraction. A linear array of single channel waveguides, each propagating a single channel within the near infrared wavelength range, is optically coupled to the collimating/focusing optic. Each single channel waveguide has a center and a propagating end and the propagating ends are spaced the focal length from the collimating/focusing optic and the centers of adjacent demultiplexed waveguides are spaced the select channel separation. Preferably the groove spacing is between about 50 and 300 grooves per millimeter and the blaze angle is between 51-53°. The near infrared wavelength range is preferably between about 1520 and 1610 nm and the echelle grating preferably has a free spectral range at least as large as the near infrared wavelength range. The select channel spacing is preferably 0.4 nm or less, the preferred channel separation is at least 40 microns (&mgr;) and the focal length is preferably less than 152.4 mm. The select order of diffraction is between 4 and 7. The resolution of the grating is preferably at least 20,000 and the grating has an efficiency of at least 75%. The multiplex and the single channel waveguides are preferably optical fibers.
A second aspect of the present invention is an apparatus for use in optical communication systems to multiplex or demultiplex
Murphy Gerry
Sappey Andrew D.
Palmer Phan T. H.
Swanson & Bratschun LLC
Zolo Technologies, Inc.
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