Optical amplifier configuration including shared pumps

• US 6,426,833 B1
• Filed: 07/28/2000
• Issued: 07/30/2002
• Est. Priority Date: 07/28/2000
• Status: Expired due to Term

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Bao, Jun
• Primary Examiner(s): Moskowitz, Nelson
• Application Number:
  US09/628,259
• Time in Patent Office: 732 Days
• Field of Search: 359/134, 359/160, 359/334, 359/341.32, 359/341.33, 372/3, 372/70
• US Class Current: 359/341.32
• CPC Class Codes: H01S 3/06754 Fibre amplifiers H01S3/06708 takes precedence
• CPC Class Codes: H01S 3/094011 with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre
• CPC Class Codes: H01S 3/09408 Pump redundancy

Abstract

An optical amplifier including shared pumps sources. Outputs from a plurality amplifier pump sources are combined and then divided before being injected into one or more amplifying fiber segments. By sharing pumps, signal loss is avoided in the event of pump failure.

Claims

1. An optical device, comprising:

a plurality of segments of optical fiber connected along an optical communication path, each of said plurality of segments of optical fiber being doped with a rare earth element and being configured to carry a plurality of optical signals, each of said plurality of optical signals corresponding to a respective one of a plurality of wavelengths;

a splitter having an input and a plurality of outputs, each of said plurality of outputs being coupled to a respective one of said plurality of segments of optical fiber;

a coupler having an output and a plurality of inputs, said output being coupled to said input of said splitter; and

a plurality of pump lasers, each of which being coupled to a respective one of said plurality of inputs of said coupler, wherein a gain associated with each of said plurality of optical signals is reduced by less than 1.5 dB over a range of wavelengths within 1572 nm to 1605 nm upon a decrease in a power level of one said pump lasers, a first selected one of said plurality of outputs of said splitter being configured to supply pump light from said plurality of pump lasers to one of said plurality of segments of optical fiber in a forward direction and a second selected one of said plurality of outputs of said splitter being configured to supply said pump light to said one of said plurality of segments of optical fiber in a reverse direction, said forward and reverse directions being relative to a direction of propagation of said plurality of optical signals carried by said plurality of segments of optical fiber.

2. An optical device in accordance with claim 1, wherein said rare earth element is selected from the group of erbium, neodymium, praseodymium, ytterbium, and mixtures thereof.