Optical waveguides – With optical coupler – Input/output coupler
Patent
1993-09-14
1994-08-16
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
G02B 600, G02B 636
Patent
active
053393732
ABSTRACT:
An optical branching and coupling device is provided in which the loss of light in receiving and in transmission is substantially reduced while at the same time the wavelength-branching characteristic is remarkably improved. The optical branching and coupling device connected to a first optical fiber for inputting a first ray of light and a second ray of light of which respective wavelengths are different from each other and for outputting the first ray and to a second optical fiber for outputting the second ray, and having therein a light-emitting element for emitting the first ray and a light-receiving element for receiving the first ray, the optical branching and coupling device including a first filter for receiving the two rays input from the first optical fiber and a ray of light emitted from the light-emitting element, and a second filter for receiving the rays from the first filter and sending them to the second optical fiber and to the light-receiving element, wherein the first filter is formed, on its front side, with a first filter film adapted to substantially transmit the first ray and to substantially reflect the second ray and, on its back side, with a mirror film adapted to transmit a portion of each of the rays and to reflect the rest thereof; and wherein the second filter is formed, on its front side, with a second filter film adapted to substantially transmit the first ray and to substantially reflect the second ray and, on its back side, with an antireflective film adapted to substantially transmit the first ray.
REFERENCES:
patent: 4373782 (1983-02-01), Thelen
patent: 4423922 (1984-01-01), Porter
patent: 4564260 (1986-01-01), Dirmeyer et al.
patent: 4753508 (1988-06-01), Meuleman
patent: 5050953 (1991-09-01), Anderson et al.
patent: 5255333 (1993-10-01), Althaus et al.
Nakata Naotaro
Tanaka Haruo
Rohm & Co., Ltd.
Ullah Akm E.
LandOfFree
Optical branching and coupling device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical branching and coupling device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical branching and coupling device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-959174