Claims
- 1. An optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal, comprising:a doped fiber to which an optical data signal is input and which outputs said amplified optical data signal, a surveillance signal source which outputs said optical surveillance signal; and a coupler which multiplexes said amplified optical data signal and said optical surveillance signal; wherein a wavelength of the optical surveillance signal is proximate to the wavelength of the amplified optical data signal, and is able to be demultiplexed from the wavelength of said amplified optical data signal.
- 2. An optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal, comprising:a doped fiber to which an optical data signal is input and which outputs said amplified optical data signal; a surveillance signal source which outputs said optical surveillance signal; and a coupler which multiplexes said amplified optical data signal and said optical surveillance signal; wherein a wavelength of the optical surveillance signal is in the range from 1.48 μm to 1.60 μm.
- 3. An optical transmission equipment according to claim 2, wherein the wavelength of the optical surveillance signal is 1.48 μm.
- 4. An optical transmission equipment according to claim 2, wherein the wavelength of the optical surveillance signal is 1.60 μm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-087247 |
Apr 1992 |
JP |
|
Parent Case Info
This is a continuation of application Ser. No. 09/244,856 now U.S. Pat. No. 6,018,405 filed Feb. 5, 1998, which is a continuation of application Ser. No. 08/746,027 filed Nov. 5, 1996, U.S. Pat. No. 5,875,046, which is a continuation of application Ser. No. 08/705,366 filed Aug. 29, 1996, U.S. Pat. No. 5,812,289, which is a continuation of application Ser. No. 08/044,425 filed Apr. 7, 1993, U.S. Pat. No. 5,555,477, which is a continuation-in-part of application Ser. No. 08/023,546 filed Feb. 26, 1993, U.S. Pat. No. 5,500,756.
US Referenced Citations (20)
Foreign Referenced Citations (11)
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0 440 276 |
Jan 1991 |
EP |
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JP |
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JP |
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JP |
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JP |
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JP |
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JP |
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Nov 1991 |
JP |
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JP |
3-270520 |
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JP |
4-29123 |
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JP |
Non-Patent Literature Citations (2)
Entry |
Saito, Prechirp Technique for Dispersion Compensation for a High-Speed Long-Span Tranmission; IEEE (1991) vol. 3, No. 1. |
Kazuo Aida, et al.; IM/DD Optical Transmission Systems Using Optical Amplifiers; NTT R&D vol. 40 No. 2 1991. |
Continuations (4)
|
Number |
Date |
Country |
Parent |
09/244856 |
Feb 1998 |
US |
Child |
09/409872 |
|
US |
Parent |
08/746027 |
Nov 1996 |
US |
Child |
09/244856 |
|
US |
Parent |
08/705366 |
Aug 1996 |
US |
Child |
08/746027 |
|
US |
Parent |
08/044425 |
Apr 1993 |
US |
Child |
08/705366 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/023546 |
Feb 1993 |
US |
Child |
08/044425 |
|
US |