| 摘要 |
A Raman optical amplifier 114 has at least one pump laser 113 for outputting a pump spectrum and, optically connected to the pump laser, a non-liner optical fibre 111 for broadening the pump spectrum to increase linearity of gain of the amplifier with respect to wavelength. The increase in linearity means that, where more than one pump laser is used to pump the optical amplifier, fewer pump lasers are required for a given gain linearity. The nonlinear optical fibre may be, for example, a dispersion flattened fibre or a "holey" fibre having longitudinal bores in cladding of the fibre. The amplification may occur in the non-liner optical fibre 111 or in a linear optical transmission fibre 115 to which the non-linear fibre is optically connected.
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